Fe–O system

336 accepted literature values from 1 paper(s) (experimental 3, model 333); 2 calculated phase diagram(s). 2 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	3
model	333

Accepted values by property group
Property group	Values
phase transition	3
formation	2
heat capacity / entropy / enthalpy	234
activity / EMF / Gibbs energy	97

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
FeO-02Luo.tdb	R. Luoma, PhD thesis, Helsinki, 2002.	`444e225f4fad778c586debebf6166cc7b6c21ff0d0cc41b452662e848222b8d7`	viewer · TDB · JSON
FeO-91Sun-orig.tdb	B. Sundman, J. Phase Equilib., 12, 127-40(1991). doi:10.1007/BF02645709	`214f51010594d665a06ab8a77c9a46279b29a53f0f33557a0bb56a13da570fb9`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
FeO-02Luo.tdb	1852.41	SPINEL_H11 (x(O) 0.57649) + LIQUID (x(O) 0.58105) + GAS (x(O) 1)
FeO-02Luo.tdb	1801.58	BCC_A2 (x(O) 2.900e-4) + LIQUID#2 (x(O) 0.00519) + LIQUID (x(O) 0.50589)
FeO-02Luo.tdb	1692.43	LIQUID (x(O) 0.54172) + HALITE_B1 (x(O) 0.54506) + SPINEL_H11 (x(O) 0.57095)
FeO-02Luo.tdb	1664.23	FCC_A1 (x(O) 1.000e-4) + BCC_A2 (x(O) 2.100e-4) + LIQUID (x(O) 0.50834)
FeO-02Luo.tdb	1642.22	FCC_A1 (x(O) 9.000e-5) + LIQUID (x(O) 0.50876) + HALITE_B1 (x(O) 0.51227)
FeO-02Luo.tdb	1184.91	BCC_A2 (x(O) 1.000e-5) + FCC_A1 (x(O) 1.000e-5) + HALITE_B1 (x(O) 0.51203)
FeO-02Luo.tdb	832.32	BCC_A2 (x(O) 0) + HALITE_B1 (x(O) 0.51382) + SPINEL_H11 (x(O) 0.57126)
FeO-91Sun-orig.tdb	1853.49	SPINEL_H11 (x(O) 0.57647) + ION (x(O) 0.58105) + GAS (x(O) 1)
FeO-91Sun-orig.tdb	1801.98	BCC_A2 (x(O) 2.800e-4) + ION#2 (x(O) 0.00495) + ION (x(O) 0.50554)
FeO-91Sun-orig.tdb	1725.46	SPINEL_H11 (x(O) 0.57994) + CORUNDUM_D51 (x(O) 0.6) + GAS (x(O) 1)
FeO-91Sun-orig.tdb	1695.47	ION (x(O) 0.5419) + HALITE_B1 (x(O) 0.54514) + SPINEL_H11 (x(O) 0.57095)
FeO-91Sun-orig.tdb	1664.4	FCC_A1 (x(O) 1.000e-4) + BCC_A2 (x(O) 2.100e-4) + ION (x(O) 0.5069)
FeO-91Sun-orig.tdb	1642.72	FCC_A1 (x(O) 1.000e-4) + ION (x(O) 0.50718) + HALITE_B1 (x(O) 0.51227)
FeO-91Sun-orig.tdb	1184.92	FCC_A1 (x(O) 1.000e-5) + BCC_A2 (x(O) 2.000e-5) + HALITE_B1 (x(O) 0.51203)
FeO-91Sun-orig.tdb	832.32	BCC_A2 (x(O) 0) + HALITE_B1 (x(O) 0.51382) + SPINEL_H11 (x(O) 0.57126)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull FeO-02Luo · CALPHAD hull FeO-09Pov · CALPHAD hull FeO-91Sun-LB · CALPHAD hull FeO-91Sun-orig · CALPHAD hull FeO-93Tay · CALPHAD hull FeO-95Kow · CALPHAD hull FeO-96Sel

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Fe–O system (2)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location	Quote
Fe0.947O		-265.152 kJ/mol (basis unstated)	298.15	model			[1] Sundman 1991	Table 2, p. 8, row 1 report
Magnetite (Fe3O4)	Fe3O4	-159.411 kJ/mol-atom	298.15	model	-157.23 (mp-aaaabcoo)	-160.234 (oqmd-1362615)	[1] Sundman 1991	Table 3, p. 9, row 1 report

Other properties

Phase transition (3)

Phase transition, Fe–O system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	830 K	830	wiistite + magnetite + ferrite	experimental	[1] Sundman 1991	p. 1 report	Although wiistite decomposes around 830 K to magnetite and ferrite, it is possible to prevent this by rapid cooling.
Phase transition	943 K	943	magnetic	experimental	[1] Sundman 1991	p. 7 report	There is a lambda anomaly in the corundum heat capacity at 943 K, which was described using the same magnetic model as for magnetite.
Phase transition	1697 K	1697	liquid + magnetite	experimental	[1] Sundman 1991 cites ref. 13	p. 1 report	The first, with bcc and magnetite, and the second, with fcc and liquid, were taken from the paper by Darken and Gurry,3 and the third, with liquid and magnetite at 1697 K, from the second paper by Darken and Gurry. 13

Heat capacity / entropy / enthalpy (234)

Heat capacity / entropy / enthalpy, Fe–O system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: S	58.734 J/mol (basis unstated)/K	298.15	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 2 report
Entropy printed: S	17.5664 J/mol-atom/K	298.15	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 1 report
Entropy printed: S	20.8291 J/mol-atom/K	298.15	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 1 report
Entropy printed: S	66.514 J/mol (basis unstated)/K	350	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 3 report
Entropy printed: S	21.1114 J/mol-atom/K	350	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 2 report
Entropy printed: S	24.4186 J/mol-atom/K	350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 2 report
Entropy printed: S	24.277 J/mol-atom/K	400	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 3 report
Entropy printed: S	27.6146 J/mol-atom/K	400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 3 report
Entropy printed: S	78.917 J/mol (basis unstated)/K	450	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 5 report
Entropy printed: S	27.204 J/mol-atom/K	450	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 4 report
Entropy printed: S	30.5881 J/mol-atom/K	450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 4 report
Entropy printed: S	84.207 J/mol (basis unstated)/K	500	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 6 report
Entropy printed: S	29.9194 J/mol-atom/K	500	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 5 report
Entropy printed: S	33.3801 J/mol-atom/K	500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 5 report
Entropy printed: S	89.046 J/mol (basis unstated)/K	550	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 7 report
Entropy printed: S	32.4536 J/mol-atom/K	550	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 6 report
Entropy printed: S	36.0254 J/mol-atom/K	550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 6 report
Entropy printed: S	93.512 J/mol (basis unstated)/K	600	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 8 report
Entropy printed: S	34.8344 J/mol-atom/K	600	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 7 report
Entropy printed: S	38.5543 J/mol-atom/K	600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 7 report
Entropy printed: S	97.665 J/mol (basis unstated)/K	650	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 9 report
Entropy printed: S	37.0874 J/mol-atom/K	650	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 8 report
Entropy printed: S	40.9937 J/mol-atom/K	650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 8 report
Entropy printed: S	101.552 J/mol (basis unstated)/K	700	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 10 report
Entropy printed: S	39.236 J/mol-atom/K	700	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 9 report
Entropy printed: S	43.3709 J/mol-atom/K	700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 9 report
Entropy printed: S	105.209 J/mol (basis unstated)/K	750	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 11 report
Entropy printed: S	41.3014 J/mol-atom/K	750	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 10 report
Entropy printed: S	45.7174 J/mol-atom/K	750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 10 report
Entropy printed: S	108.666 J/mol (basis unstated)/K	800	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 12 report
Entropy printed: S	43.3056 J/mol-atom/K	800	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 11 report
Entropy printed: S	48.0747 J/mol-atom/K	800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 11 report
Entropy printed: S	50.4043 J/mol-atom/K	848	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 12 report
Entropy printed: S	111.947 J/mol (basis unstated)/K	850	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 13 report
Entropy printed: S	45.2718 J/mol-atom/K	850	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 12 report
Entropy printed: S	50.4833 J/mol-atom/K	850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 13 report
Entropy printed: S	115.073 J/mol (basis unstated)/K	900	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 14 report
Entropy printed: S	47.2282 J/mol-atom/K	900	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 13 report
Entropy printed: S	52.327 J/mol-atom/K	900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 14 report
Entropy printed: S	118.059 J/mol (basis unstated)/K	950	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 15 report
Entropy printed: S	49.213 J/mol-atom/K	950	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 14 report
Entropy printed: S	53.9933 J/mol-atom/K	950	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 15 report
Entropy printed: S	49.415 J/mol-atom/K	955	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 15 report
Entropy printed: S	120.922 J/mol (basis unstated)/K	1000	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 16 report
Entropy printed: S	50.8378 J/mol-atom/K	1000	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 16 report
Entropy printed: S	55.5367 J/mol-atom/K	1000	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 16 report
Entropy printed: S	123.671 J/mol (basis unstated)/K	1050	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 17 report
Entropy printed: S	52.2816 J/mol-atom/K	1050	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 17 report
Entropy printed: S	56.9843 J/mol-atom/K	1050	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 17 report
Entropy printed: S	126.319 J/mol (basis unstated)/K	1100	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 18 report
Entropy printed: S	53.6256 J/mol-atom/K	1100	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 18 report
Entropy printed: S	58.3523 J/mol-atom/K	1100	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 18 report
Entropy printed: S	128.874 J/mol (basis unstated)/K	1150	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 19 report
Entropy printed: S	54.8906 J/mol-atom/K	1150	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 19 report
Entropy printed: S	59.6523 J/mol-atom/K	1150	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 19 report
Entropy printed: S	131.344 J/mol (basis unstated)/K	1200	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 20 report
Entropy printed: S	56.0894 J/mol-atom/K	1200	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 20 report
Entropy printed: S	60.8929 J/mol-atom/K	1200	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 20 report
Entropy printed: S	133.736 J/mol (basis unstated)/K	1250	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 21 report
Entropy printed: S	57.2308 J/mol-atom/K	1250	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 21 report
Entropy printed: S	62.0806 J/mol-atom/K	1250	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 21 report
Entropy printed: S	136.056 J/mol (basis unstated)/K	1300	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 22 report
Entropy printed: S	58.3216 J/mol-atom/K	1300	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 22 report
Entropy printed: S	63.2211 J/mol-atom/K	1300	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 22 report
Entropy printed: S	138.31 J/mol (basis unstated)/K	1350	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 23 report
Entropy printed: S	59.367 J/mol-atom/K	1350	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 23 report
Entropy printed: S	64.3189 J/mol-atom/K	1350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 23 report
Entropy printed: S	140.502 J/mol (basis unstated)/K	1400	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 24 report
Entropy printed: S	60.3712 J/mol-atom/K	1400	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 24 report
Entropy printed: S	65.3777 J/mol-atom/K	1400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 24 report
Entropy printed: S	142.636 J/mol (basis unstated)/K	1450	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 25 report
Entropy printed: S	61.338 J/mol-atom/K	1450	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 25 report
Entropy printed: S	66.4009 J/mol-atom/K	1450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 25 report
Entropy printed: S	144.717 J/mol (basis unstated)/K	1500	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 26 report
Entropy printed: S	62.2702 J/mol-atom/K	1500	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 26 report
Entropy printed: S	67.3913 J/mol-atom/K	1500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 26 report
Entropy printed: S	146.749 J/mol (basis unstated)/K	1550	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 27 report
Entropy printed: S	63.1708 J/mol-atom/K	1550	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 27 report
Entropy printed: S	68.3514 J/mol-atom/K	1550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 27 report
Entropy printed: S	148.733 J/mol (basis unstated)/K	1600	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 28 report
Entropy printed: S	64.0416 J/mol-atom/K	1600	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 28 report
Entropy printed: S	69.2834 J/mol-atom/K	1600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 28 report
Entropy printed: S	150.674 J/mol (basis unstated)/K	1650	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 29 report
Entropy printed: S	64.8848 J/mol-atom/K	1650	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 29 report
Entropy printed: S	70.1894 J/mol-atom/K	1650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 29 report
Entropy printed: S	152.573 J/mol (basis unstated)/K	1700	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 30 report
Entropy printed: S	65.7024 J/mol-atom/K	1700	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 30 report
Entropy printed: S	71.071 J/mol-atom/K	1700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 30 report
Entropy printed: S	66.496 J/mol-atom/K	1750	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 31 report
Entropy printed: S	71.9297 J/mol-atom/K	1750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 31 report
Entropy printed: S	67.2668 J/mol-atom/K	1800	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 32 report
Entropy printed: S	72.7671 J/mol-atom/K	1800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 32 report
Entropy printed: S	68.0162 J/mol-atom/K	1850	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 33 report
Entropy printed: S	73.5844 J/mol-atom/K	1850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 33 report
Entropy printed: S	68.7454 J/mol-atom/K	1900	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 34 report
Entropy printed: S	74.3829 J/mol-atom/K	1900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 34 report
Heat capacity printed: Cp	48.2381 J/mol (basis unstated)/K	298.15	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 2 report
Heat capacity printed: Cp	21.0966 J/mol-atom/K	298.15	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 1 report
Heat capacity printed: Cp	21.4641 J/mol-atom/K	298.15	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 1 report
Heat capacity printed: Cp	48.8176 J/mol (basis unstated)/K	350	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 3 report
Heat capacity printed: Cp	23.0376 J/mol-atom/K	350	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 2 report
Heat capacity printed: Cp	23.1217 J/mol-atom/K	350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 2 report
Heat capacity printed: Cp	49.3764 J/mol (basis unstated)/K	400	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 4 report
Heat capacity printed: Cp	24.3394 J/mol-atom/K	400	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 3 report
Heat capacity printed: Cp	24.363 J/mol-atom/K	400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 3 report
Heat capacity printed: Cp	49.9352 J/mol (basis unstated)/K	450	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 5 report
Heat capacity printed: Cp	25.3464 J/mol-atom/K	450	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 4 report
Heat capacity printed: Cp	25.4539 J/mol-atom/K	450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 4 report
Heat capacity printed: Cp	50.494 J/mol (basis unstated)/K	500	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 6 report
Heat capacity printed: Cp	26.199 J/mol-atom/K	500	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 5 report
Heat capacity printed: Cp	26.5057 J/mol-atom/K	500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 5 report
Heat capacity printed: Cp	51.0529 J/mol (basis unstated)/K	550	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 7 report
Heat capacity printed: Cp	26.9826 J/mol-atom/K	550	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 6 report
Heat capacity printed: Cp	27.5956 J/mol-atom/K	550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 6 report
Heat capacity printed: Cp	51.6117 J/mol (basis unstated)/K	600	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 8 report
Heat capacity printed: Cp	27.755 J/mol-atom/K	600	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 7 report
Heat capacity printed: Cp	28.7901 J/mol-atom/K	600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 7 report
Heat capacity printed: Cp	52.1705 J/mol (basis unstated)/K	650	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 9 report
Heat capacity printed: Cp	28.562 J/mol-atom/K	650	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 8 report
Heat capacity printed: Cp	30.1656 J/mol-atom/K	650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 8 report
Heat capacity printed: Cp	52.7293 J/mol (basis unstated)/K	700	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 10 report
Heat capacity printed: Cp	29.4484 J/mol-atom/K	700	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 9 report
Heat capacity printed: Cp	31.8306 J/mol-atom/K	700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 9 report
Heat capacity printed: Cp	53.2881 J/mol (basis unstated)/K	750	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 11 report
Heat capacity printed: Cp	30.4674 J/mol-atom/K	750	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 10 report
Heat capacity printed: Cp	33.9661 J/mol-atom/K	750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 10 report
Heat capacity printed: Cp	53.8469 J/mol (basis unstated)/K	800	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 12 report
Heat capacity printed: Cp	31.695 J/mol-atom/K	800	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 11 report
Heat capacity printed: Cp	36.8953 J/mol-atom/K	800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 11 report
Heat capacity printed: Cp	41.003 J/mol-atom/K	848	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 12 report
Heat capacity printed: Cp	54.4058 J/mol (basis unstated)/K	850	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 13 report
Heat capacity printed: Cp	33.251 J/mol-atom/K	850	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 12 report
Heat capacity printed: Cp	32.2516 J/mol-atom/K	850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 13 report
Heat capacity printed: Cp	54.9646 J/mol (basis unstated)/K	900	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 14 report
Heat capacity printed: Cp	35.3362 J/mol-atom/K	900	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 13 report
Heat capacity printed: Cp	30.2089 J/mol-atom/K	900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 14 report
Heat capacity printed: Cp	55.5234 J/mol (basis unstated)/K	950	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 15 report
Heat capacity printed: Cp	38.2956 J/mol-atom/K	950	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 14 report
Heat capacity printed: Cp	29.276 J/mol-atom/K	950	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 15 report
Heat capacity printed: Cp	38.6596 J/mol-atom/K	955	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 15 report
Heat capacity printed: Cp	56.0822 J/mol (basis unstated)/K	1000	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 16 report
Heat capacity printed: Cp	30.093 J/mol-atom/K	1000	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 16 report
Heat capacity printed: Cp	28.7849 J/mol-atom/K	1000	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 16 report
Heat capacity printed: Cp	56.641 J/mol (basis unstated)/K	1050	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 17 report
Heat capacity printed: Cp	29.1766 J/mol-atom/K	1050	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 17 report
Heat capacity printed: Cp	28.5099 J/mol-atom/K	1050	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 17 report
Heat capacity printed: Cp	57.1999 J/mol (basis unstated)/K	1100	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 18 report
Heat capacity printed: Cp	28.6406 J/mol-atom/K	1100	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 18 report
Heat capacity printed: Cp	28.3577 J/mol-atom/K	1100	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 18 report
Heat capacity printed: Cp	57.7587 J/mol (basis unstated)/K	1150	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 19 report
Heat capacity printed: Cp	28.293 J/mol-atom/K	1150	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 19 report
Heat capacity printed: Cp	28.2827 J/mol-atom/K	1150	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 19 report
Heat capacity printed: Cp	58.3175 J/mol (basis unstated)/K	1200	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 20 report
Heat capacity printed: Cp	28.0524 J/mol-atom/K	1200	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 20 report
Heat capacity printed: Cp	28.2593 J/mol-atom/K	1200	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 20 report
Heat capacity printed: Cp	58.8763 J/mol (basis unstated)/K	1250	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 21 report
Heat capacity printed: Cp	27.879 J/mol-atom/K	1250	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 21 report
Heat capacity printed: Cp	28.272 J/mol-atom/K	1250	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 21 report
Heat capacity printed: Cp	59.4351 J/mol (basis unstated)/K	1300	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 22 report
Heat capacity printed: Cp	27.7504 J/mol-atom/K	1300	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 22 report
Heat capacity printed: Cp	28.3106 J/mol-atom/K	1300	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 22 report
Heat capacity printed: Cp	59.9939 J/mol (basis unstated)/K	1350	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 23 report
Heat capacity printed: Cp	27.6534 J/mol-atom/K	1350	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 23 report
Heat capacity printed: Cp	28.3683 J/mol-atom/K	1350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 23 report
Heat capacity printed: Cp	60.5528 J/mol (basis unstated)/K	1400	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 24 report
Heat capacity printed: Cp	27.5794 J/mol-atom/K	1400	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 24 report
Heat capacity printed: Cp	28.4403 J/mol-atom/K	1400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 24 report
Heat capacity printed: Cp	61.1116 J/mol (basis unstated)/K	1450	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 25 report
Heat capacity printed: Cp	27.5222 J/mol-atom/K	1450	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 25 report
Heat capacity printed: Cp	28.523 J/mol-atom/K	1450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 25 report
Heat capacity printed: Cp	61.6704 J/mol (basis unstated)/K	1500	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 26 report
Heat capacity printed: Cp	27.478 J/mol-atom/K	1500	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 26 report
Heat capacity printed: Cp	28.6139 J/mol-atom/K	1500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 26 report
Heat capacity printed: Cp	62.2292 J/mol (basis unstated)/K	1550	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 27 report
Heat capacity printed: Cp	27.4434 J/mol-atom/K	1550	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 27 report
Heat capacity printed: Cp	28.7111 J/mol-atom/K	1550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 27 report
Heat capacity printed: Cp	62.788 J/mol (basis unstated)/K	1600	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 28 report
Heat capacity printed: Cp	27.4166 J/mol-atom/K	1600	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 28 report
Heat capacity printed: Cp	28.8133 J/mol-atom/K	1600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 28 report
Heat capacity printed: Cp	63.3469 J/mol (basis unstated)/K	1650	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 29 report
Heat capacity printed: Cp	27.3956 J/mol-atom/K	1650	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 29 report
Heat capacity printed: Cp	28.9193 J/mol-atom/K	1650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 29 report
Heat capacity printed: Cp	63.9057 J/mol (basis unstated)/K	1700	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 30 report
Heat capacity printed: Cp	27.379 J/mol-atom/K	1700	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 30 report
Heat capacity printed: Cp	29.0284 J/mol-atom/K	1700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 30 report
Heat capacity printed: Cp	27.3662 J/mol-atom/K	1750	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 31 report
Heat capacity printed: Cp	29.1399 J/mol-atom/K	1750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 31 report
Heat capacity printed: Cp	27.3564 J/mol-atom/K	1800	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 32 report
Heat capacity printed: Cp	29.2531 J/mol-atom/K	1800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 32 report
Heat capacity printed: Cp	27.3488 J/mol-atom/K	1850	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 33 report
Heat capacity printed: Cp	29.3679 J/mol-atom/K	1850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 33 report
Heat capacity printed: Cp	27.343 J/mol-atom/K	1900	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 34 report
Heat capacity printed: Cp	29.484 J/mol-atom/K	1900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 34 report
Heat content printed: H-H(298.15)	0 J/mol	298.15	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 1 report
Heat content printed: H-H(298.15)	2516.2 J/mol	350	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 3 report
Heat content printed: H-H(298.15)	8136 J/mol	350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 2 report
Heat content printed: H-H(298.15)	4971 J/mol	400	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 4 report
Heat content printed: H-H(298.15)	16519 J/mol	400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 3 report
Heat content printed: H-H(298.15)	7453.8 J/mol	450	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 5 report
Heat content printed: H-H(298.15)	25359 J/mol	450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 4 report
Heat content printed: H-H(298.15)	9964.5 J/mol	500	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 6 report
Heat content printed: H-H(298.15)	34637 J/mol	500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 5 report
Heat content printed: H-H(298.15)	12503.2 J/mol	550	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 7 report
Heat content printed: H-H(298.15)	44355 J/mol	550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 6 report
Heat content printed: H-H(298.15)	15069.8 J/mol	600	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 8 report
Heat content printed: H-H(298.15)	54531 J/mol	600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 7 report
Heat content printed: H-H(298.15)	17664.4 J/mol	650	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 9 report
Heat content printed: H-H(298.15)	65201 J/mol	650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 8 report
Heat content printed: H-H(298.15)	76432 J/mol	700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 9 report
Heat content printed: H-H(298.15)	88340 J/mol	750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 10 report
Heat content printed: H-H(298.15)	101130 J/mol	800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 11 report
Heat content printed: H-H(298.15)	114570 J/mol	848	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 12 report
Heat content printed: H-H(298.15)	115039 J/mol	850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 13 report
Heat content printed: H-H(298.15)	126326 J/mol	900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 14 report
Heat content printed: H-H(298.15)	137111 J/mol	950	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 15 report
Heat content printed: H-H(298.15)	147642 J/mol	1000	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 16 report
Heat content printed: H-H(298.15)	158025 J/mol	1050	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 17 report
Heat content printed: H-H(298.15)	168317 J/mol	1100	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 18 report
Heat content printed: H-H(298.15)	178553 J/mol	1150	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 19 report
Heat content printed: H-H(298.15)	188755 J/mol	1200	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 20 report
Heat content printed: H-H(298.15)	198938 J/mol	1250	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 21 report
Heat content printed: H-H(298.15)	209116 J/mol	1300	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 22 report
Heat content printed: H-H(298.15)	219297 J/mol	1350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 23 report
Heat content printed: H-H(298.15)	229487 J/mol	1400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 24 report
Heat content printed: H-H(298.15)	239692 J/mol	1450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 25 report
Heat content printed: H-H(298.15)	249917 J/mol	1500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 26 report
Heat content printed: H-H(298.15)	260166 J/mol	1550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 27 report
Heat content printed: H-H(298.15)	270441 J/mol	1600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 28 report
Heat content printed: H-H(298.15)	280745 J/mol	1650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 29 report
Heat content printed: H-H(298.15)	291081 J/mol	1700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 30 report
Heat content printed: H-H(298.15)	301450 J/mol	1750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 31 report
Heat content printed: H-H(298.15)	311854 J/mol	1800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 32 report
Heat content printed: H-H(298.15)	322295 J/mol	1850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 33 report
Heat content printed: H-H(298.15)	332773 J/mol	1900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 34 report

Activity / EMF / Gibbs energy (97)

Activity / EMF / Gibbs energy, Fe–O system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Gibbs energy printed: G	-282664 J/mol	298.15	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 2 report
Gibbs energy printed: G	-849474 J/mol	298.15	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 1 report
Gibbs energy printed: G	-1159210 J/mol	298.15	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 1 report
Gibbs energy printed: G	-285916 J/mol	350	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 3 report
Gibbs energy printed: G	-854493 J/mol	350	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 2 report
Gibbs energy printed: G	-1167570 J/mol	350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 2 report
Gibbs energy printed: G	-289409 J/mol	400	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 4 report
Gibbs energy printed: G	-860172 J/mol	400	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 3 report
Gibbs energy printed: G	-1176680 J/mol	400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 3 report
Gibbs energy printed: G	-293211 J/mol	450	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 5 report
Gibbs energy printed: G	-866612 J/mol	450	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 4 report
Gibbs energy printed: G	-1186870 J/mol	450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 4 report
Gibbs energy printed: G	-297292 J/mol	500	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 6 report
Gibbs energy printed: G	-873756 J/mol	500	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 5 report
Gibbs energy printed: G	-1198070 J/mol	500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 5 report
Gibbs energy printed: G	-301625 J/mol	550	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 7 report
Gibbs energy printed: G	-881557 J/mol	550	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 6 report
Gibbs energy printed: G	-1210220 J/mol	550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 6 report
Gibbs energy printed: G	-306190 J/mol	600	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 8 report
Gibbs energy printed: G	-889970 J/mol	600	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 7 report
Gibbs energy printed: G	-1223270 J/mol	600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 7 report
Gibbs energy printed: G	-310971 J/mol	650	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 9 report
Gibbs energy printed: G	-898963 J/mol	650	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 8 report
Gibbs energy printed: G	-1237200 J/mol	650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 8 report
Gibbs energy printed: G	-315952 J/mol	700	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 10 report
Gibbs energy printed: G	-908506 J/mol	700	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 9 report
Gibbs energy printed: G	-1251960 J/mol	700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 9 report
Gibbs energy printed: G	-321122 J/mol	750	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 11 report
Gibbs energy printed: G	-918574 J/mol	750	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 10 report
Gibbs energy printed: G	-1267550 J/mol	750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 10 report
Gibbs energy printed: G	-326470 J/mol	800	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 12 report
Gibbs energy printed: G	-929151 J/mol	800	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 11 report
Gibbs energy printed: G	-1283960 J/mol	800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 11 report
Gibbs energy printed: G	-1300510 J/mol	848	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 12 report
Gibbs energy printed: G	-331986 J/mol	850	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 13 report
Gibbs energy printed: G	-940224 J/mol	850	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 12 report
Gibbs energy printed: G	-1301210 J/mol	850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 13 report
Gibbs energy printed: G	-337662 J/mol	900	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 14 report
Gibbs energy printed: G	-951786 J/mol	900	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 13 report
Gibbs energy printed: G	-1319210 J/mol	900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 14 report
Gibbs energy printed: G	-343491 J/mol	950	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 15 report
Gibbs energy printed: G	-963840 J/mol	950	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 14 report
Gibbs energy printed: G	-1337820 J/mol	950	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 15 report
Gibbs energy printed: G	-965073 J/mol	955	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 15 report
Gibbs energy printed: G	-349466 J/mol	1000	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 16 report
Gibbs energy printed: G	-976355 J/mol	1000	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 16 report
Gibbs energy printed: G	-1356990 J/mol	1000	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 16 report
Gibbs energy printed: G	-355581 J/mol	1050	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 17 report
Gibbs energy printed: G	-989247 J/mol	1050	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 17 report
Gibbs energy printed: G	-1376690 J/mol	1050	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 17 report
Gibbs energy printed: G	-361831 J/mol	1100	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 18 report
Gibbs energy printed: G	-1002490 J/mol	1100	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 18 report
Gibbs energy printed: G	-1396870 J/mol	1100	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 18 report
Gibbs energy printed: G	-368211 J/mol	1150	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 19 report
Gibbs energy printed: G	-1016050 J/mol	1150	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 19 report
Gibbs energy printed: G	-1417520 J/mol	1150	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 19 report
Gibbs energy printed: G	-374717 J/mol	1200	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 20 report
Gibbs energy printed: G	-1029930 J/mol	1200	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 20 report
Gibbs energy printed: G	-1438620 J/mol	1200	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 20 report
Gibbs energy printed: G	-381344 J/mol	1250	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 21 report
Gibbs energy printed: G	-1044090 J/mol	1250	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 21 report
Gibbs energy printed: G	-1460140 J/mol	1250	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 21 report
Gibbs energy printed: G	-388089 J/mol	1300	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 22 report
Gibbs energy printed: G	-1058540 J/mol	1300	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 22 report
Gibbs energy printed: G	-1482070 J/mol	1300	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 22 report
Gibbs energy printed: G	-394949 J/mol	1350	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 23 report
Gibbs energy printed: G	-1073250 J/mol	1350	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 23 report
Gibbs energy printed: G	-1504390 J/mol	1350	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 23 report
Gibbs energy printed: G	-401919 J/mol	1400	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 24 report
Gibbs energy printed: G	-1088220 J/mol	1400	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 24 report
Gibbs energy printed: G	-1527090 J/mol	1400	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 24 report
Gibbs energy printed: G	-408998 J/mol	1450	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 25 report
Gibbs energy printed: G	-1103430 J/mol	1450	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 25 report
Gibbs energy printed: G	-1550150 J/mol	1450	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 25 report
Gibbs energy printed: G	-416182 J/mol	1500	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 26 report
Gibbs energy printed: G	-1118880 J/mol	1500	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 26 report
Gibbs energy printed: G	-1573570 J/mol	1500	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 26 report
Gibbs energy printed: G	-423469 J/mol	1550	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 27 report
Gibbs energy printed: G	-1134570 J/mol	1550	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 27 report
Gibbs energy printed: G	-1597320 J/mol	1550	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 27 report
Gibbs energy printed: G	-430856 J/mol	1600	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 28 report
Gibbs energy printed: G	-1150470 J/mol	1600	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 28 report
Gibbs energy printed: G	-1621410 J/mol	1600	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 28 report
Gibbs energy printed: G	-438342 J/mol	1650	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 29 report
Gibbs energy printed: G	-1166580 J/mol	1650	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 29 report
Gibbs energy printed: G	-1645820 J/mol	1650	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 29 report
Gibbs energy printed: G	-445923 J/mol	1700	Fe0.947O alloy: O 0.513611	model	[1] Sundman 1991	Table 2, p. 8, row 30 report
Gibbs energy printed: G	-1182910 J/mol	1700	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 30 report
Gibbs energy printed: G	-1670540 J/mol	1700	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 30 report
Gibbs energy printed: G	-1199430 J/mol	1750	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 31 report
Gibbs energy printed: G	-1695570 J/mol	1750	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 31 report
Gibbs energy printed: G	-1216150 J/mol	1800	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 32 report
Gibbs energy printed: G	-1720890 J/mol	1800	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 32 report
Gibbs energy printed: G	-1233060 J/mol	1850	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 33 report
Gibbs energy printed: G	-1746500 J/mol	1850	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 33 report
Gibbs energy printed: G	-1250160 J/mol	1900	Fe2O3 alloy: O 0.6	model	[1] Sundman 1991	Table 4, p. 11, row 34 report
Gibbs energy printed: G	-1772400 J/mol	1900	Magnetite (Fe3O4) alloy: O 0.571429	model	[1] Sundman 1991	Table 3, p. 9, row 34 report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

B Sundman, An assessment of the Fe-O system, JPE 12, 127-140 (1991). doi:10.1007/bf02645709

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0). Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}