La system

26 accepted literature values from 8 paper(s) (experimental 11, model 4, DFT 1, unspecified 10); 0 calculated phase diagram(s).

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Accepted values by evidence class
Evidence class	Values
experimental	11
model	4
DFT	1
unspecified	10

Accepted values by property group
Property group	Values
invariant reaction	4
phase transition	3
formation	1
crystal structure	18

Invariant reactions (literature)

Invariant reactions reported in the literature for the La system (4)
T (K)	Reaction / phases	Class	Source	Location
1138	γLa->βLa (fcc)	experimental	[1] Huang 2000 cites Eremenko 1988	Table 1, p. 2, row 4 report
1134	γLa->βLa (fcc)	model	[1] Huang 2000 cites Dinsdale 1991 doi	Table 1, p. 2, row 3 report
583	βLa->αLa (dhcp)	experimental	[1] Huang 2000 cites Eremenko 1988	Table 1, p. 2, row 6 report
550	βLa->αLa (dhcp)	model	[1] Huang 2000 cites Dinsdale 1991 doi	Table 1, p. 2, row 5 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, La system (1)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location	Quote
La		0 kJ/mol-atom	0	DFT			[2] Zhou 2006	Table 3, p. 6, row 28 report

Other properties

Phase transition (3)

Phase transition, La system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	550.05 K	550.05	(βLa) ↔ (αLa) (βLa): ; (αLa):	experimental	[3] Wang 2012 cites This	Table 2, p. 4, row 11 report
Phase transition	550.05 K	550.05	(βLa) ↔ (αLa) (βLa): ; (αLa):	model	[3] Wang 2012	Table 2, p. 4, row 12 report
Phase transition	992.3 K	992.3	polymorphic: La alloy: La 1	model	[4] Norgren 2000 cites Norgren	Table 1, p. 4, row 1 report

Crystal structure (18)

Crystal structure, La system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	5.29 Å		(β La) alloy: La 1	experimental	[5] Peng 2011 cites Eliseev 1964	Table 1, p. 2, row 2 report
Lattice a	4.29 Å		Bcc(La) alloy: La 1	experimental	[6] Tang 2013 cites Villars 2013	Table 2, p. 3, row 1 report
Lattice a	4.25 Å	0	Bcc(La) alloy: La 1	unspecified	[6] Tang 2013	Table 2, p. 3, row 2 report
Lattice a	3.772 Å		Dhcp(La) alloy: La 1	experimental	[6] Tang 2013 cites Villars 2013	Table 2, p. 3, row 5 report
Lattice a	3.762 Å	0	Dhcp(La) alloy: La 1	unspecified	[6] Tang 2013	Table 2, p. 3, row 6 report
Lattice a	5.29 Å		Fcc(La) alloy: La 1	experimental	[6] Tang 2013 cites Villars 2013	Table 2, p. 3, row 3 report
Lattice a	5.26 Å	0	Fcc(La) alloy: La 1	unspecified	[6] Tang 2013	Table 2, p. 3, row 4 report
Lattice a	3.77 Å	298.15	(α La) alloy: La 1	experimental	[5] Peng 2011 cites Spedding 1961 doi	Table 1, p. 2, row 1 report
Lattice a	3.77 Å	298.15	(αLa) alloy: La 1	unspecified	[7] An 2013	Table 3, p. 5, row 1 report
Lattice a	3.77 Å	298.15	(αLa) alloy: La 1	unspecified	[8] An 2012	Table 2, p. 5, row 1 report
Lattice a	5.303 Å	298.15	(βLa) alloy: La 1	unspecified	[8] An 2012	Table 2, p. 5, row 3 report
Lattice a	5.303 Å	298.15	(βLa) alloy: La 1	unspecified	[7] An 2013	Table 3, p. 5, row 3 report
Lattice a	4.26 Å	298.15	(γ La) alloy: La 1	experimental	[5] Peng 2011 cites Spedding 1961 doi	Table 1, p. 2, row 3 report
Lattice a	4.26 Å	298.15	(γLa) alloy: La 1	unspecified	[8] An 2012	Table 2, p. 5, row 2 report
Lattice a	4.26 Å	298.15	(γLa) alloy: La 1	unspecified	[7] An 2013	Table 3, p. 5, row 2 report
Lattice c	12.144 Å		Dhcp(La) alloy: La 1	experimental	[6] Tang 2013 cites Villars 2013	Table 2, p. 3, row 5 report
Lattice c	12.078 Å	0	Dhcp(La) alloy: La 1	unspecified	[6] Tang 2013	Table 2, p. 3, row 6 report
Lattice c	12.13 Å	298.15	(α La) alloy: La 1	experimental	[5] Peng 2011 cites Spedding 1961 doi	Table 1, p. 2, row 1 report

Sources

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

Minhwa Huang, Xuping Su, Fucheng Yin, Ping Zhang, Zhi Li, Chuntao Chen, A thermodynamic assessment of the La–Sn system, Journal of Alloys and Compounds 309, 147-153 (2000). doi:10.1016/s0925-8388(00)01077-x
S.H. Zhou, R.E. Napolitano, Phase equilibria and thermodynamic limits for partitionless crystallization in the Al–La binary system, Acta Materialia 54, 831-840 (2006). doi:10.1016/j.actamat.2005.10.013
Y. Wang, B. Hu, S. Liu, Y. Du, Thermodynamic reassessment of the La-Mn system, J min metall B Metall 48, 391-394 (2012). doi:10.2298/jmmb120717049w
Susanne Norgren, Thermodynamic assessment of the Ho-Tb, Ho-Dy, Ho-Er, Er-Tb, and Er-Dy systems, JPE 21, 148-156 (2000). doi:10.1361/105497100770340200
Yingbiao Peng, Yong Du, Lijun Zhang, Chunsheng Sha, Shuhong Liu, Feng Zheng et al., Thermodynamic modeling of the C–RE (RE=La, Ce and Pr) systems, Calphad 35, 533-541 (2011). doi:10.1016/j.calphad.2011.09.002
Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013). doi:10.1007/s11669-013-0231-4
X.H. An, Q.F. Gu, J.Y. Zhang, S.L. Chen, X.B. Yu, Q. Li, Experimental investigation and thermodynamic reassessment of La–Ni and LaNi5–H systems, Calphad 40, 48-55 (2013). doi:10.1016/j.calphad.2012.12.002
Xuehui An, Qian Li, Jieyu Zhang, Shuanglin Chen, Ying Yang, Phase equilibria of the La–Ni–Cu ternary system at 673 K: Thermodynamic modeling and experimental validation, Calphad 36, 8-15 (2012). doi:10.1016/j.calphad.2011.10.004

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 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_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}
}