Er–Ge system

142 accepted literature values from 1 paper(s) (experimental 50, model 92); 1 calculated phase diagram(s). 11 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 (16) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	50
model	92

Accepted values by property group
Property group	Values
invariant reaction	29
phase transition	15
formation	98

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
ErGe-17Ach.tdb	K. Achgar, S. Kardellass, N. Selhaoui, L. Bouirden, J. Alloys Compd., 724, 1157-66(2017). doi:10.1016/j.jallcom.2017.07.129	`734d825c539b2116bc40e48db92f736d49fcf28423faf12a27652e29002bc34e`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
ErGe-17Ach.tdb	2153.2	ER5GE3_D88 (x(Ge) 0.39504) + LIQUID (x(Ge) 0.44241) + ER5GE4 (x(Ge) 0.44444)
ErGe-17Ach.tdb	2153.2	ER5GE3_D88 (x(Ge) 0.39509) + LIQUID (x(Ge) 0.44251) + ER5GE4 (x(Ge) 0.44444)
ErGe-17Ach.tdb	1978.86	ER5GE4 (x(Ge) 0.44444) + ER11GE10 (x(Ge) 0.47619) + LIQUID (x(Ge) 0.53245)
ErGe-17Ach.tdb	1978.86	ER5GE4 (x(Ge) 0.44444) + ER11GE10 (x(Ge) 0.47619) + LIQUID (x(Ge) 0.53238)
ErGe-17Ach.tdb	1739.39	ER11GE10 (x(Ge) 0.47619) + ERGE_B33 (x(Ge) 0.5) + LIQUID (x(Ge) 0.59763)
ErGe-17Ach.tdb	1739.39	ER11GE10 (x(Ge) 0.47619) + ERGE_B33 (x(Ge) 0.5) + LIQUID (x(Ge) 0.59767)
ErGe-17Ach.tdb	1739.39	ER11GE10 (x(Ge) 0.47619) + ERGE_B33 (x(Ge) 0.5) + LIQUID (x(Ge) 0.59761)
ErGe-17Ach.tdb	1676.46	ERGE_B33 (x(Ge) 0.5) + ER2GE3_C32 (x(Ge) 0.6) + LIQUID (x(Ge) 0.61374)
ErGe-17Ach.tdb	1676.46	ERGE_B33 (x(Ge) 0.5) + ER2GE3_C32 (x(Ge) 0.6) + LIQUID (x(Ge) 0.61376)
ErGe-17Ach.tdb	1676.46	ERGE_B33 (x(Ge) 0.5) + ER2GE3_C32 (x(Ge) 0.6) + LIQUID (x(Ge) 0.61356)
ErGe-17Ach.tdb	1595.38	HCP_A3 (x(Ge) 0) + LIQUID (x(Ge) 0.154) + ER5GE3_D88 (x(Ge) 0.375)
ErGe-17Ach.tdb	1595.38	HCP_A3 (x(Ge) 0) + LIQUID (x(Ge) 0.15397) + ER5GE3_D88 (x(Ge) 0.375)
ErGe-17Ach.tdb	1535.75	ERGE_B33 (x(Ge) 0.5) + ER3GE4 (x(Ge) 0.57143) + ER2GE3_C32 (x(Ge) 0.6)
ErGe-17Ach.tdb	1313.59	ER2GE3_C32 (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.7588)
ErGe-17Ach.tdb	1313.58	ER2GE3_C32 (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.75892)
ErGe-17Ach.tdb	1239	ER3GE4 (x(Ge) 0.57143) + ER2GE3_LT (x(Ge) 0.6) + ER2GE3_C32 (x(Ge) 0.6)
ErGe-17Ach.tdb	1239	ER2GE3_C32 (x(Ge) 0.6) + ER2GE3_LT (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667)
ErGe-17Ach.tdb	1234.45	ER2GE3_LT (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667)
ErGe-17Ach.tdb	1234.45	ERGE2_MT (x(Ge) 0.66667) + ERGE2_HT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.79517)
ErGe-17Ach.tdb	1234.45	ERGE2_HT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.79526)
ErGe-17Ach.tdb	1179.78	ER2GE3_LT (x(Ge) 0.6) + ERGE2_LT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667)
ErGe-17Ach.tdb	1179.78	ERGE2_LT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.81864)
ErGe-17Ach.tdb	1179.78	ERGE2_MT (x(Ge) 0.66667) + ERGE2_LT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.81877)
ErGe-17Ach.tdb	1153.27	ERGE2_LT (x(Ge) 0.66667) + ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83025)
ErGe-17Ach.tdb	1153.27	ERGE2_LT (x(Ge) 0.66667) + ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83023)
ErGe-17Ach.tdb	1153.27	ERGE2_LT (x(Ge) 0.66667) + ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83038)
ErGe-17Ach.tdb	1139.25	ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83986) + DIAMOND_A4 (x(Ge) 1)
ErGe-17Ach.tdb	1139.25	ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83993) + DIAMOND_A4 (x(Ge) 1)
ErGe-17Ach.tdb	1139.25	ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83995) + DIAMOND_A4 (x(Ge) 1)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Er–Ge system (29)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
2151.15	peritectic: Er5Ge3 -> L + Er5Ge4	Er5Ge3: Ge 0.375; L: Ge 0.432; Er5Ge4: Ge 0.444444	model	[1] Achgar 2017	Table 2, p. 5, row 11 report
2148.15	peritectic: Er5Ge3 -> L + Er5Ge4	Er5Ge3: Ge 0.375; L: Ge 0.443; Er5Ge4: Ge 0.444444	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 10 report
2147.15	peritectic: Er5Ge3 -> L + Er5Ge4	Er5Ge3: Ge 0.375; L: Ge 0.437; Er5Ge4: Ge 0.444444	model	[1] Achgar 2017	Table 2, p. 5, row 12 report
1993.15	peritectic: Er5Ge4 -> L + Er11Ge10	Er5Ge4: Ge 0.444444; L: Ge 0.479; Er11Ge10: Ge 0.47619	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 13 report
1992.15	peritectic: Er5Ge4 -> L + Er11Ge10	Er5Ge4: Ge 0.444444; L: Ge 0.527; Er11Ge10: Ge 0.47619	model	[1] Achgar 2017	Table 2, p. 5, row 15 report
1991.15	peritectic: Er5Ge4 -> L + Er11Ge10	Er5Ge4: Ge 0.444444; L: Ge 0.529; Er11Ge10: Ge 0.47619	model	[1] Achgar 2017	Table 2, p. 5, row 14 report
1724.15	peritectic: Er11Ge10 -> L + Er Ge	Er11Ge10: Ge 0.47619; L: Ge 0.568; Er Ge: Ge 0.5	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 16 report
1722.15	peritectic: Er11Ge10 -> L + Er Ge	Er11Ge10: Ge 0.47619; L: Ge 0.602; Er Ge: Ge 0.5	model	[1] Achgar 2017	Table 2, p. 5, row 17 report
1717.15	peritectic: Er11Ge10 -> L + Er Ge	Er11Ge10: Ge 0.47619; L: Ge 0.602; Er Ge: Ge 0.5	model	[1] Achgar 2017	Table 2, p. 5, row 18 report
1678.15	peritectic: ErGe -> L + HT_Er2Ge3	ErGe: Ge 0.5; L: Ge 0.633; HT_Er2Ge3: Ge 0.6	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 31 report
1677.15	peritectic: ErGe -> L + HT_Er2Ge3	ErGe: Ge 0.5; L: Ge 0.612; HT_Er2Ge3: Ge 0.6	model	[1] Achgar 2017	Table 2, p. 5, row 33 report
1676.15	peritectic: ErGe -> L + HT_Er2Ge3	ErGe: Ge 0.5; L: Ge 0.613; HT_Er2Ge3: Ge 0.6	model	[1] Achgar 2017	Table 2, p. 5, row 32 report
1640.15	peritectoid: Er3Ge4 -> Er Ge2 + HT_Er2Ge3	Er3Ge4: Ge 0.571; Er Ge2: Ge 0.666667; HT_Er2Ge3: Ge 0.6	model	[1] Achgar 2017	Table 2, p. 5, row 21 report
1640.15	peritectoid: Er3Ge4 -> Er Ge2 + HT_Er2Ge3	Er3Ge4: Ge 0.571; Er Ge2: Ge 0.666667; HT_Er2Ge3: Ge 0.6	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 19 report
1639.15	peritectoid: Er3Ge4 -> Er Ge2 + HT_Er2Ge3	Er3Ge4: Ge 0.571; Er Ge2: Ge 0.666667; HT_Er2Ge3: Ge 0.6	model	[1] Achgar 2017	Table 2, p. 5, row 20 report
1599.15	eutectic: L -> Er + Er5Ge3	L: Ge 0.152; Er5Ge3: Ge 0.375	model	[1] Achgar 2017	Table 2, p. 5, row 6 report
1595.15	eutectic		experimental	[1] Achgar 2017 cites Tsuchiya 2006 doi	p. 2 report	The addition of germanium to erbium results in eutectic reaction among liquid, Er (hcp_A3) and Er5Ge3 at 1322 C about 12 at.% Ge in Ge rich part.
1595.15	eutectic: L -> Er + Er5Ge3	L: Ge 0.12; Er5Ge3: Ge 0.375	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 4 report
1595.15	eutectic: L -> Er + Er5Ge3	L: Ge 0.15; Er5Ge3: Ge 0.375	model	[1] Achgar 2017	Table 2, p. 5, row 5 report
1319.15	peritectic: HT_Er2Ge3 -> L + HT_ErGe2	HT_Er2Ge3: Ge 0.6; L: Ge 0.757; HT_ErGe2: Ge 0.666667	model	[1] Achgar 2017	Table 2, p. 5, row 35 report
1315.15	peritectic: HT_Er2Ge3 -> L + HT_ErGe2	HT_Er2Ge3: Ge 0.6; L: Ge 0.757; HT_ErGe2: Ge 0.666667	model	[1] Achgar 2017	Table 2, p. 5, row 36 report
1310.15	peritectic: HT_Er2Ge3 -> L + HT_ErGe2	HT_Er2Ge3: Ge 0.6; L: Ge 0.768; HT_ErGe2: Ge 0.666667	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 34 report
1164.15	peritectic: LT_ErGe2 -> L + Er2Ge5	LT_ErGe2: Ge 0.666667; L: Ge 0.826; Er2Ge5: Ge 0.714286	model	[1] Achgar 2017	Table 2, p. 5, row 38 report
1164.15	peritectic: LT_ErGe2 -> L + Er2Ge5	LT_ErGe2: Ge 0.666667; L: Ge 0.824; Er2Ge5: Ge 0.714286	model	[1] Achgar 2017	Table 2, p. 5, row 39 report
1163.15	peritectic: LT_ErGe2 -> L + Er2Ge5	LT_ErGe2: Ge 0.666667; L: Ge 0.833; Er2Ge5: Ge 0.714286	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 37 report
1150.15	eutectic: L -> Er2Ge5 + Ge	L: Ge 0.85; Er2Ge5: Ge 0.714286; Ge: Ge 1	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 40 report
1150.15	eutectic		experimental	[1] Achgar 2017	p. 2 report	The addition of erbium to germanium results in a eutectic reaction among liquid, Er2Ge5 and Ge (diamond_A4) at 877 C and about 85 at. % Ge.
1142.15	eutectic: L -> Er2Ge5 + Ge	L: Ge 0.841; Er2Ge5: Ge 0.714286; Ge: Ge 1	model	[1] Achgar 2017	Table 2, p. 5, row 41 report
1142.15	eutectic: L -> Er2Ge5 + Ge	L: Ge 0.84; Er2Ge5: Ge 0.714286; Ge: Ge 1	model	[1] Achgar 2017	Table 2, p. 5, row 42 report

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, Er–Ge system (35)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Er11Ge10	Er11Ge10	-94.3 kJ/mol-atom ± 2	950	experimental	-81.13 (mp-aaacqmlg)	-80.917 (oqmd-665638)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 10 report
Er11Ge10	Er11Ge10	-93.5 kJ/mol-atom	950	model	-81.13 (mp-aaacqmlg)	-80.917 (oqmd-665638)	[1] Achgar 2017	Table 5, p. 7, row 12 report
Er11Ge10	Er11Ge10	-93.37 kJ/mol-atom	950	model	-81.13 (mp-aaacqmlg)	-80.917 (oqmd-665638)	[1] Achgar 2017	Table 5, p. 7, row 11 report
Er2Ge5	Er2Ge5	-65.51 kJ/mol-atom	950	model	-49.089 (mp-aaaabsbh)	-49.307 (oqmd-15631)	[1] Achgar 2017	Table 5, p. 7, row 36 report
Er2Ge5	Er2Ge5	-65.4 kJ/mol-atom	950	model	-49.089 (mp-aaaabsbh)	-49.307 (oqmd-15631)	[1] Achgar 2017	Table 5, p. 7, row 35 report
Er2Ge5	Er2Ge5	-59.6 kJ/mol-atom ± 0.9	950	experimental	-49.089 (mp-aaaabsbh)	-49.307 (oqmd-15631)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 34 report
Er3Ge4	Er3Ge4	-88.28 kJ/mol-atom	950	model	-74.125 (mp-aaaaacnv)	-74.277 (oqmd-14536)	[1] Achgar 2017	Table 5, p. 7, row 18 report
Er3Ge4	Er3Ge4	-88.09 kJ/mol-atom	950	model	-74.125 (mp-aaaaacnv)	-74.277 (oqmd-14536)	[1] Achgar 2017	Table 5, p. 7, row 17 report
Er3Ge4	Er3Ge4	-85.9 kJ/mol-atom ± 1.4	950	experimental	-74.125 (mp-aaaaacnv)	-74.277 (oqmd-14536)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 16 report
Er5Ge3	Er5Ge3	-95.6 kJ/mol-atom ± 2	298.15	experimental	-77.425 (mp-aaaaarny)	-77.604 (oqmd-18316)	[1] Achgar 2017 cites Meschel 1997 doi	Table 5, p. 7, row 2 report
Er5Ge3	Er5Ge3	-95.2 kJ/mol-atom ± 2.7	950	experimental	-77.425 (mp-aaaaarny)	-77.604 (oqmd-18316)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 1 report
Er5Ge3	Er5Ge3	-91.88 kJ/mol-atom	950	model	-77.425 (mp-aaaaarny)	-77.604 (oqmd-18316)	[1] Achgar 2017	Table 5, p. 7, row 6 report
Er5Ge3	Er5Ge3	-91.45 kJ/mol-atom	950	model	-77.425 (mp-aaaaarny)	-77.604 (oqmd-18316)	[1] Achgar 2017	Table 5, p. 7, row 5 report
Er5Ge3	Er5Ge3	-75 kJ/mol-atom		model	-77.425 (mp-aaaaarny)	-77.604 (oqmd-18316)	[1] Achgar 2017 cites A 1983	Table 5, p. 7, row 3 report
Er5Ge4	Er5Ge4	-94.8 kJ/mol-atom ± 2.2	950	experimental	-81.76 (mp-aaacqbaq)	-82.178 (oqmd-665639)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 7 report
Er5Ge4	Er5Ge4	-92.97 kJ/mol-atom	950	model	-81.76 (mp-aaacqbaq)	-82.178 (oqmd-665639)	[1] Achgar 2017	Table 5, p. 7, row 9 report
Er5Ge4	Er5Ge4	-92.81 kJ/mol-atom	950	model	-81.76 (mp-aaacqbaq)	-82.178 (oqmd-665639)	[1] Achgar 2017	Table 5, p. 7, row 8 report
ErGe	ErGe	-94.15 kJ/mol-atom	950	model	-82.273 (mp-aaaaadjc)	-82.483 (oqmd-7744)	[1] Achgar 2017	Table 5, p. 7, row 15 report
ErGe	ErGe	-93.66 kJ/mol-atom	950	model	-82.273 (mp-aaaaadjc)	-82.483 (oqmd-7744)	[1] Achgar 2017	Table 5, p. 7, row 14 report
ErGe	ErGe	-92.2 kJ/mol-atom ± 1.8	950	experimental	-82.273 (mp-aaaaadjc)	-82.483 (oqmd-7744)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 13 report
HT_Er2Ge3	Er2Ge3	-84.13 kJ/mol-atom	950	model	-44.391 (mp-aaacrtbd)		[1] Achgar 2017	Table 5, p. 7, row 24 report
HT_Er2Ge3	Er2Ge3	-83.93 kJ/mol-atom	950	model	-44.391 (mp-aaacrtbd)		[1] Achgar 2017	Table 5, p. 7, row 23 report
HT_Er2Ge3	Er2Ge3	-83.4 kJ/mol-atom ± 1.3	950	experimental	-44.391 (mp-aaacrtbd)		[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 22 report
HT_ErGe2	ErGe2	-73.63 kJ/mol-atom	950	model		-27.011 (oqmd-1591438)	[1] Achgar 2017	Table 5, p. 7, row 33 report
HT_ErGe2	ErGe2	-73.51 kJ/mol-atom	950	model		-27.011 (oqmd-1591438)	[1] Achgar 2017	Table 5, p. 7, row 32 report
HT_ErGe2	ErGe2	-69.5 kJ/mol-atom ± 1	950	experimental		-27.011 (oqmd-1591438)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 31 report
LT_Er2Ge3	Er2Ge3	-84.23 kJ/mol-atom	950	model	-44.391 (mp-aaacrtbd)		[1] Achgar 2017	Table 5, p. 7, row 21 report
LT_Er2Ge3	Er2Ge3	-84.05 kJ/mol-atom	950	model	-44.391 (mp-aaacrtbd)		[1] Achgar 2017	Table 5, p. 7, row 20 report
LT_Er2Ge3	Er2Ge3	-83.4 kJ/mol-atom ± 1.3	950	experimental	-44.391 (mp-aaacrtbd)		[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 19 report
LT_ErGe2	ErGe2	-73.95 kJ/mol-atom	950	model		-27.011 (oqmd-1591438)	[1] Achgar 2017	Table 5, p. 7, row 27 report
LT_ErGe2	ErGe2	-73.87 kJ/mol-atom	950	model		-27.011 (oqmd-1591438)	[1] Achgar 2017	Table 5, p. 7, row 26 report
LT_ErGe2	ErGe2	-69.5 kJ/mol-atom ± 1	950	experimental		-27.011 (oqmd-1591438)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 25 report
MT_ErGe2	ErGe2	-73.88 kJ/mol-atom	950	model		-27.011 (oqmd-1591438)	[1] Achgar 2017	Table 5, p. 7, row 30 report
MT_ErGe2	ErGe2	-73.87 kJ/mol-atom	950	model		-27.011 (oqmd-1591438)	[1] Achgar 2017	Table 5, p. 7, row 29 report
MT_ErGe2	ErGe2	-69.5 kJ/mol-atom ± 1	950	experimental		-27.011 (oqmd-1591438)	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 28 report

Other properties

Phase transition (15)

Phase transition, Er–Ge system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	1180.15 K	1180.15	polymorphic: LT_ErGe2 -> MT_ErGe2 LT_ErGe2: Ge 0.66; MT_ErGe2: Ge 0.666667	model	[1] Achgar 2017	Table 2, p. 5, row 27 report
Phase transition	1180.15 K	1180.15	polymorphic: LT_ErGe2 -> MT_ErGe2 LT_ErGe2: Ge 0.66; MT_ErGe2: Ge 0.666667	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 25 report
Phase transition	1181.15 K	1181.15	polymorphic: LT_ErGe2 -> MT_ErGe2 LT_ErGe2: Ge 0.66; MT_ErGe2: Ge 0.666667	model	[1] Achgar 2017	Table 2, p. 5, row 26 report
Phase transition	1205.15 K	1205.15	polymorphic: MT_ErGe2 -> HT_ErGe2 MT_ErGe2: Ge 0.66; HT_ErGe2: Ge 0.666667	model	[1] Achgar 2017	Table 2, p. 5, row 30 report
Phase transition	1205.15 K	1205.15	polymorphic: MT_ErGe2 -> HT_ErGe2 MT_ErGe2: Ge 0.66; HT_ErGe2: Ge 0.666667	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 28 report
Phase transition	1205.15 K	1205.15	polymorphic: MT_ErGe2 -> HT_ErGe2 MT_ErGe2: Ge 0.66; HT_ErGe2: Ge 0.666667	model	[1] Achgar 2017	Table 2, p. 5, row 29 report
Phase transition	1216.15 K	1216.15	polymorphic: LT_Er2Ge3 -> HT_Er2Ge3 LT_Er2Ge3: Ge 0.6; HT_Er2Ge3: Ge 0.6	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 22 report
Phase transition	1216.15 K	1216.15	polymorphic: LT_Er2Ge3 -> HT_Er2Ge3 LT_Er2Ge3: Ge 0.6; HT_Er2Ge3: Ge 0.6	model	[1] Achgar 2017	Table 2, p. 5, row 24 report
Phase transition	1216.15 K	1216.15	polymorphic: LT_Er2Ge3 -> HT_Er2Ge3 LT_Er2Ge3: Ge 0.6; HT_Er2Ge3: Ge 0.6	model	[1] Achgar 2017	Table 2, p. 5, row 23 report
Phase transition	1802.15 K	1802.15	congruent melting: L -> Er L: Ge 0	model	[1] Achgar 2017	Table 2, p. 5, row 2 report
Phase transition	1802.15 K	1802.15	congruent melting: L -> Er L: Ge 0	model	[1] Achgar 2017	Table 2, p. 5, row 3 report
Phase transition	1802.15 K	1802.15	congruent melting: L -> Er L: Ge 0	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 1 report
Phase transition	2221.15 K	2221.15	congruent melting: L -> Er5Ge3 L: Ge 0.375; Er5Ge3: Ge 0.375	model	[1] Achgar 2017	Table 2, p. 5, row 8 report
Phase transition	2223.15 K	2223.15	congruent melting: L -> Er5Ge3 L: Ge 0.375; Er5Ge3: Ge 0.375	experimental	[1] Achgar 2017 cites Eremenko 1981	Table 2, p. 5, row 7 report
Phase transition	2227.15 K	2227.15	congruent melting: L -> Er5Ge3 L: Ge 0.375; Er5Ge3: Ge 0.375	model	[1] Achgar 2017	Table 2, p. 5, row 9 report

Formation (63)

Formation, Er–Ge system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy of formation	-3.08 J/mol-atom/K		Er5Ge3 alloy: Ge 0.375	model	[1] Achgar 2017 cites Safonov 1985	Table 5, p. 7, row 4 report
Entropy of formation	-17.9 J/mol-atom/K ± 1.7	950	Er11Ge10 alloy: Ge 0.47619	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 10 report
Entropy of formation	-1.47 J/mol-atom/K	950	Er11Ge10 alloy: Ge 0.47619	model	[1] Achgar 2017	Table 5, p. 7, row 12 report
Entropy of formation	-1.5 J/mol-atom/K	950	Er11Ge10 alloy: Ge 0.47619	model	[1] Achgar 2017	Table 5, p. 7, row 11 report
Entropy of formation	-3.71 J/mol-atom/K	950	Er2Ge5 alloy: Ge 0.714286	model	[1] Achgar 2017	Table 5, p. 7, row 35 report
Entropy of formation	-3.7 J/mol-atom/K	950	Er2Ge5 alloy: Ge 0.714286	model	[1] Achgar 2017	Table 5, p. 7, row 36 report
Entropy of formation	-11.7 J/mol-atom/K ± 0.9	950	Er2Ge5 alloy: Ge 0.714286	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 34 report
Entropy of formation	-16.7 J/mol-atom/K ± 1.4	950	Er3Ge4 alloy: Ge 0.571429	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 16 report
Entropy of formation	-2.38 J/mol-atom/K	950	Er3Ge4 alloy: Ge 0.571429	model	[1] Achgar 2017	Table 5, p. 7, row 18 report
Entropy of formation	-2.97 J/mol-atom/K	950	Er5Ge3 alloy: Ge 0.375	model	[1] Achgar 2017	Table 5, p. 7, row 6 report
Entropy of formation	-2.96 J/mol-atom/K	950	Er5Ge3 alloy: Ge 0.375	model	[1] Achgar 2017	Table 5, p. 7, row 5 report
Entropy of formation	-17.6 J/mol-atom/K ± 1.6	950	Er5Ge3 alloy: Ge 0.375	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 1 report
Entropy of formation	-1.14 J/mol-atom/K	950	Er5Ge4 alloy: Ge 0.444444	model	[1] Achgar 2017	Table 5, p. 7, row 9 report
Entropy of formation	-17.8 J/mol-atom/K ± 1.8	950	Er5Ge4 alloy: Ge 0.444444	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 7 report
Entropy of formation	-2.68 J/mol-atom/K	950	ErGe alloy: Ge 0.5	model	[1] Achgar 2017	Table 5, p. 7, row 15 report
Entropy of formation	-17.6 J/mol-atom/K ± 1.6	950	ErGe alloy: Ge 0.5	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 13 report
Entropy of formation	-2.49 J/mol-atom/K	950	ErGe alloy: Ge 0.5	model	[1] Achgar 2017	Table 5, p. 7, row 14 report
Entropy of formation	-1.08 J/mol-atom/K	950	HT_Er2Ge3 alloy: Ge 0.6	model	[1] Achgar 2017	Table 5, p. 7, row 24 report
Entropy of formation	-16.3 J/mol-atom/K ± 1.3	950	HT_Er2Ge3 alloy: Ge 0.6	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 22 report
Entropy of formation	-2.05 J/mol-atom/K	950	HT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 33 report
Entropy of formation	-2.07 J/mol-atom/K	950	HT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 32 report
Entropy of formation	-13.6 J/mol-atom/K ± 1.1	950	HT_ErGe2 alloy: Ge 0.666667	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 31 report
Entropy of formation	-16.3 J/mol-atom/K ± 1.3	950	LT_Er2Ge3 alloy: Ge 0.6	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 19 report
Entropy of formation	-1.18 J/mol-atom/K	950	LT_Er2Ge3 alloy: Ge 0.6	model	[1] Achgar 2017	Table 5, p. 7, row 20 report
Entropy of formation	-1.16 J/mol-atom/K	950	LT_Er2Ge3 alloy: Ge 0.6	model	[1] Achgar 2017	Table 5, p. 7, row 21 report
Entropy of formation	-13.6 J/mol-atom/K ± 1.1	950	LT_ErGe2 alloy: Ge 0.666667	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 25 report
Entropy of formation	-2.37 J/mol-atom/K	950	LT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 26 report
Entropy of formation	-2.36 J/mol-atom/K	950	MT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 29 report
Entropy of formation	-13.6 J/mol-atom/K ± 1.1	950	MT_ErGe2 alloy: Ge 0.666667	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 28 report
Entropy of formation	-2.26 J/mol-atom/K	950	MT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 30 report
Gibbs energy of formation printed: Gibbs free Energy	-77.32 kJ/mol-atom ± 0.16	950	Er11Ge10 alloy: Ge 0.47619	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 10 report
Gibbs energy of formation printed: Gibbs free Energy	-92.1 kJ/mol-atom	950	Er11Ge10 alloy: Ge 0.47619	model	[1] Achgar 2017	Table 5, p. 7, row 12 report
Gibbs energy of formation printed: Gibbs free Energy	-91.95 kJ/mol-atom	950	Er11Ge10 alloy: Ge 0.47619	model	[1] Achgar 2017	Table 5, p. 7, row 11 report
Gibbs energy of formation printed: Gibbs free Energy	-61.87 kJ/mol-atom	950	Er2Ge5 alloy: Ge 0.714286	model	[1] Achgar 2017	Table 5, p. 7, row 35 report
Gibbs energy of formation printed: Gibbs free Energy	-61.99 kJ/mol-atom	950	Er2Ge5 alloy: Ge 0.714286	model	[1] Achgar 2017	Table 5, p. 7, row 36 report
Gibbs energy of formation printed: Gibbs free Energy	-48.47 kJ/mol-atom ± 0.08	950	Er2Ge5 alloy: Ge 0.714286	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 34 report
Gibbs energy of formation printed: Gibbs free Energy	-70.04 kJ/mol-atom ± 0.13	950	Er3Ge4 alloy: Ge 0.571429	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 16 report
Gibbs energy of formation printed: Gibbs free Energy	-86.01 kJ/mol-atom	950	Er3Ge4 alloy: Ge 0.571429	model	[1] Achgar 2017	Table 5, p. 7, row 18 report
Gibbs energy of formation printed: Gibbs free Energy	-85.83 kJ/mol-atom	950	Er3Ge4 alloy: Ge 0.571429	model	[1] Achgar 2017	Table 5, p. 7, row 17 report
Gibbs energy of formation printed: Gibbs free Energy	-89.05 kJ/mol-atom	950	Er5Ge3 alloy: Ge 0.375	model	[1] Achgar 2017	Table 5, p. 7, row 6 report
Gibbs energy of formation printed: Gibbs free Energy	-88.63 kJ/mol-atom	950	Er5Ge3 alloy: Ge 0.375	model	[1] Achgar 2017	Table 5, p. 7, row 5 report
Gibbs energy of formation printed: Gibbs free Energy	-78.4 kJ/mol-atom ± 0.22	950	Er5Ge3 alloy: Ge 0.375	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 1 report
Gibbs energy of formation printed: Gibbs free Energy	-91.88 kJ/mol-atom	950	Er5Ge4 alloy: Ge 0.444444	model	[1] Achgar 2017	Table 5, p. 7, row 9 report
Gibbs energy of formation printed: Gibbs free Energy	-91.72 kJ/mol-atom	950	Er5Ge4 alloy: Ge 0.444444	model	[1] Achgar 2017	Table 5, p. 7, row 8 report
Gibbs energy of formation printed: Gibbs free Energy	-77.91 kJ/mol-atom ± 0.18	950	Er5Ge4 alloy: Ge 0.444444	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 7 report
Gibbs energy of formation printed: Gibbs free Energy	-91.6 kJ/mol-atom	950	ErGe alloy: Ge 0.5	model	[1] Achgar 2017	Table 5, p. 7, row 15 report
Gibbs energy of formation printed: Gibbs free Energy	-75.5 kJ/mol-atom ± 0.16	950	ErGe alloy: Ge 0.5	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 13 report
Gibbs energy of formation printed: Gibbs free Energy	-91.29 kJ/mol-atom	950	ErGe alloy: Ge 0.5	model	[1] Achgar 2017	Table 5, p. 7, row 14 report
Gibbs energy of formation printed: Gibbs free Energy	-83.1 kJ/mol-atom	950	HT_Er2Ge3 alloy: Ge 0.6	model	[1] Achgar 2017	Table 5, p. 7, row 24 report
Gibbs energy of formation printed: Gibbs free Energy	-67.86 kJ/mol-atom ± 0.12	950	HT_Er2Ge3 alloy: Ge 0.6	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 22 report
Gibbs energy of formation printed: Gibbs free Energy	-82.9 kJ/mol-atom	950	HT_Er2Ge3 alloy: Ge 0.6	model	[1] Achgar 2017	Table 5, p. 7, row 23 report
Gibbs energy of formation printed: Gibbs free Energy	-71.68 kJ/mol-atom	950	HT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 33 report
Gibbs energy of formation printed: Gibbs free Energy	-71.54 kJ/mol-atom	950	HT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 32 report
Gibbs energy of formation printed: Gibbs free Energy	-56.55 kJ/mol-atom ± 0.1	950	HT_ErGe2 alloy: Ge 0.666667	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 31 report
Gibbs energy of formation printed: Gibbs free Energy	-67.86 kJ/mol-atom ± 0.12	950	LT_Er2Ge3 alloy: Ge 0.6	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 19 report
Gibbs energy of formation printed: Gibbs free Energy	-82.92 kJ/mol-atom	950	LT_Er2Ge3 alloy: Ge 0.6	model	[1] Achgar 2017	Table 5, p. 7, row 20 report
Gibbs energy of formation printed: Gibbs free Energy	-83.12 kJ/mol-atom	950	LT_Er2Ge3 alloy: Ge 0.6	model	[1] Achgar 2017	Table 5, p. 7, row 21 report
Gibbs energy of formation printed: Gibbs free Energy	-56.55 kJ/mol-atom ± 0.1	950	LT_ErGe2 alloy: Ge 0.666667	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 25 report
Gibbs energy of formation printed: Gibbs free Energy	-71.61 kJ/mol-atom	950	LT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 26 report
Gibbs energy of formation printed: Gibbs free Energy	-71.69 kJ/mol-atom	950	LT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 27 report
Gibbs energy of formation printed: Gibbs free Energy	-71.62 kJ/mol-atom	950	MT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 29 report
Gibbs energy of formation printed: Gibbs free Energy	-56.55 kJ/mol-atom ± 0.1	950	MT_ErGe2 alloy: Ge 0.666667	experimental	[1] Achgar 2017 cites Sidorko 2008	Table 5, p. 7, row 28 report
Gibbs energy of formation printed: Gibbs free Energy	-71.73 kJ/mol-atom	950	MT_ErGe2 alloy: Ge 0.666667	model	[1] Achgar 2017	Table 5, p. 7, row 30 report

Sources

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

Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017). doi:10.1016/j.jallcom.2017.07.129

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}
}