O–Tb system

31 accepted literature values from 1 paper(s) (experimental 13, model 18); 0 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · phases (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	13
model	18

Accepted values by property group
Property group	Values
phase transition	14
formation	1
heat capacity / entropy / enthalpy	8
crystal structure	3
other property	5

Convex hulls: Materials Project DFT hull · OQMD DFT hull

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, O–Tb system (1)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location	Quote
C-Tb2O3	Tb2O3	-373.04 kJ/mol-atom	298.15	model	-384.356 (mp-aaaaaboq)	-343.512 (oqmd-7282)	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 17 report

Other properties

Phase transition (14)

Phase transition, O–Tb system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1273 K	1273	polymorphic: C ⇒ B alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Hoekstra 1966	Table 2.3, p. 10, row 12 report
Phase transition	1773 K	1773	polymorphic: C ⟺ B alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Coutures 1976	Table 2.1, p. 6, row 78 report
Phase transition	1823 K	1823	B	experimental	[1] ZINKEVICH 2007 cites Foex 1966	p. 17 report	For Tb2O3, the straight line is obtained with the lowest measured transition temperature at normal pressure, 1823 K [3], which is selected as a probable value.
Phase transition	1823 K	1823	polymorphic: C <=> B alloy: O 0.6, Tb 0.4	model	[1] ZINKEVICH 2007	Table 2.2, p. 8, row 4 report
Phase transition	1823 K	1823	polymorphic: C ⟺ B alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Foex 1966	Table 2.1, p. 6, row 76 report
Phase transition	1873 K	1873	polymorphic: C ⟺ B alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Brauer 1965	Table 2.1, p. 6, row 84 report
Phase transition	2148 K	2148	polymorphic: C ⟺ B alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Warshaw 1961	Table 2.1, p. 6, row 83 report
Phase transition	2433 K	2433	polymorphic: B ⟺ H alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Foex 1966	Table 2.1, p. 6, row 77 report
Phase transition	2440 K	2440	polymorphic: B <=> H alloy: O 0.6, Tb 0.4	model	[1] ZINKEVICH 2007	Table 2.2, p. 8, row 17 report
Phase transition	2448 K	2448	polymorphic: B ⟺ H alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Shevtchenko 1985	Table 2.1, p. 6, row 81 report
Phase transition	2448 K	2448	polymorphic: B ⟺ H alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Tresvyatkii 1971	Table 2.1, p. 6, row 79 report
Phase transition	2613 K	2613	polymorphic: H ⟺ X alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Tresvyatkii 1971	Table 2.1, p. 6, row 80 report
Phase transition	2643 K	2643	polymorphic: H <=> X alloy: O 0.6, Tb 0.4	model	[1] ZINKEVICH 2007	Table 2.2, p. 8, row 31 report
Phase transition	2643 K	2643	polymorphic: H ⟺ X alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Shevtchenko 1985	Table 2.1, p. 6, row 82 report

Heat capacity / entropy / enthalpy (8)

Heat capacity / entropy / enthalpy, O–Tb system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Entropy printed: Δtrs°S	5.668 unknown		C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 22 report
Entropy printed: ΔS	3.925 J mol−1 K−1		Tb2O3 alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Hoekstra 1966	Table 5.1, p. 18, row 15 report
Entropy printed: ΔS	3.925 J mol^-1 K^-1		UNKNOWN alloy: O 0.6, Tb 0.4	experimental	[1] ZINKEVICH 2007 cites Hoekstra 1966	Table 5.1, p. 18, row 15 report
Entropy printed: °S	156.91 unknown	298.15	C-Tb₂O₃ alloy: O 0.6, Tb 0.4	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 17 report
Entropy printed: Δtrs°S	4.211 unknown	1823	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 18 report
Entropy printed: Δtrs°S	13.986 unknown	2440	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 19 report
Entropy printed: Δtrs°S	4.569 unknown	2643	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 20 report
Entropy printed: Δtrs°S	28.056 unknown	2683	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 21 report

Crystal structure (3)

Crystal structure, O–Tb system
Property	Value	T (K)	Phases / composition	Class	Source	Location
lattice molar volume	42.036 cm3 mol-1	298.15	Tb2O3 (A-type) alloy: O 0.6, Tb 0.4	model	[1] ZINKEVICH 2007	Table 3.1, p. 12, row 11 report
lattice molar volume	42.818 cm3 mol-1	298.15	Tb2O3 (B-type) alloy: O 0.6, Tb 0.4	model	[1] ZINKEVICH 2007	Table 3.1, p. 12, row 11 report
lattice molar volume	46.473 cm3 mol-1	298.15	Tb2O3 (C-type) alloy: O 0.6, Tb 0.4	model	[1] ZINKEVICH 2007	Table 3.1, p. 12, row 11 report

Other property (5)

Other property, O–Tb system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Transition enthalpy printed: Δtrs°H	13027 unknown		C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 22 report
Transition enthalpy printed: Δtrs°H	7676 unknown	1823	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 18 report
Transition enthalpy printed: Δtrs°H	34126 unknown	2440	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 19 report
Transition enthalpy printed: Δtrs°H	12076 unknown	2643	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 20 report
Transition enthalpy printed: Δtrs°H	75273 unknown	2683	C-Tb₂O₃	model	[1] ZINKEVICH 2007	Table 6.1, p. 25, row 21 report

Sources

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

M ZINKEVICH, Thermodynamics of rare earth sesquioxides, Progress in Materials Science 52, 597-647 (2007). doi:10.1016/j.pmatsci.2006.09.002

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-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); 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); 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. 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_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}
}