Cu–La system

40 accepted literature values from 2 paper(s) (experimental 17, model 11, unspecified 12); 3 calculated phase diagram(s). 1 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 (13) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	17
model	11
unspecified	12

Accepted values by property group
Property group	Values
invariant reaction	19
phase transition	9
crystal structure	12

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
CuLa-12An.tdb	X. An, Q. Li, J. Zhang, S. Chen, Y. Yang, Calphad, 36, 8-15(2012). doi:10.1016/j.calphad.2011.10.004	`96d6ecf2e7f37b9cc09db82eea90b8741b71cda1a14d610aedafc3e49e401597`	viewer · TDB · JSON
CuLa-89Qi.tdb	G. Qi, K. Itagaki, S. an Mey, P.J. Spencer, Z. Metallkd., 80, 883-87(1989). doi:10.1515/ijmr-1989-801206	`c0ed7e9c7856491b9c73ca5123122fc19baeab9defa710a7faa6b6c81b1e2872`	viewer · TDB · JSON
CuLa-99Du.tdb	Z. Du, Y. Xu, W. Zhang, J. Alloys Compd., 289, 88-95(1999). doi:10.1016/S0925-8388(99)00080-8	`41bc14252d38c854d5a1a6fe90ff3cd233ec907ef8f0a6a0d8cefb0cafed65cf`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CuLa-12An.tdb	1146.62	FCC_A1 (x(La) 0) + CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.08731)
CuLa-12An.tdb	1146.62	FCC_A1 (x(La) 0) + CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.08718)
CuLa-12An.tdb	1136.15	CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.09559) + CU6LA_B (x(La) 0.14286)
CuLa-12An.tdb	1136.15	CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.0955) + CU6LA_B (x(La) 0.14286)
CuLa-12An.tdb	1136.15	CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.09547) + CU6LA_B (x(La) 0.14286)
CuLa-12An.tdb	1134	LIQUID (x(La) 0.96733) + FCC_A1 (x(La) 1) + BCC_A2 (x(La) 1)
CuLa-12An.tdb	1099.9	FCC_A1 (x(La) 0) + CU37LA3_D23 (x(La) 0.075) + CU6LA_B (x(La) 0.14286)
CuLa-12An.tdb	1062.64	CU6LA_B (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.22238)
CuLa-12An.tdb	1062.63	CU6LA_B (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.2225)
CuLa-12An.tdb	1014.78	CU5LA_D2D (x(La) 0.16667) + CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24185)
CuLa-12An.tdb	1014.78	CU5LA_D2D (x(La) 0.16667) + CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24176)
CuLa-12An.tdb	1014.78	CU5LA_D2D (x(La) 0.16667) + CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24193)
CuLa-12An.tdb	1011.23	CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24458) + CU2LA_C32 (x(La) 0.33333)
CuLa-12An.tdb	1011.23	CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24451) + CU2LA_C32 (x(La) 0.33333)
CuLa-12An.tdb	1011.23	CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24466) + CU2LA_C32 (x(La) 0.33333)
CuLa-12An.tdb	798.58	CU2LA_C32 (x(La) 0.33333) + CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.59093)
CuLa-12An.tdb	798.58	CU2LA_C32 (x(La) 0.33333) + CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.59064)
CuLa-12An.tdb	747.99	CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.71222) + FCC_A1 (x(La) 1)
CuLa-12An.tdb	747.98	CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.71203) + FCC_A1 (x(La) 1)
CuLa-12An.tdb	550	CULA_B27 (x(La) 0.5) + DHCP (x(La) 1) + FCC_A1 (x(La) 1)
CuLa-12An.tdb	500	CU6LA_B (x(La) 0.14286) + CU6LA_A (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667)
CuLa-12An.tdb	500	FCC_A1 (x(La) 0) + CU6LA_A (x(La) 0.14286) + CU6LA_B (x(La) 0.14286)
CuLa-89Qi.tdb	1134	LIQUID (x(La) 0.96639) + FCC_A1 (x(La) 1) + BCC_A2 (x(La) 1)
CuLa-89Qi.tdb	1118.06	FCC_A1 (x(La) 0) + LIQUID (x(La) 0.09153) + CU6LA (x(La) 0.14286)
CuLa-89Qi.tdb	1118.06	FCC_A1 (x(La) 0) + LIQUID (x(La) 0.09149) + CU6LA (x(La) 0.14286)
CuLa-89Qi.tdb	1118.06	FCC_A1 (x(La) 0) + LIQUID (x(La) 0.09137) + CU6LA (x(La) 0.14286)
CuLa-89Qi.tdb	1068	CU6LA (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.22481)
CuLa-89Qi.tdb	1068	CU6LA (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.22472)
CuLa-89Qi.tdb	1027.33	CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.24653) + CU2LA_C32 (x(La) 0.33333)
CuLa-89Qi.tdb	1027.33	CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.24644) + CU2LA_C32 (x(La) 0.33333)
CuLa-89Qi.tdb	1027.33	CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.24659) + CU2LA_C32 (x(La) 0.33333)
CuLa-89Qi.tdb	802.21	CU2LA_C32 (x(La) 0.33333) + CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.62957)
CuLa-89Qi.tdb	802.21	CU2LA_C32 (x(La) 0.33333) + CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.62917)
CuLa-89Qi.tdb	756.28	CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.72215) + FCC_A1 (x(La) 1)
CuLa-89Qi.tdb	756.28	CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.7224) + FCC_A1 (x(La) 1)
CuLa-89Qi.tdb	550	CULA_B27 (x(La) 0.5) + DHCP (x(La) 1) + FCC_A1 (x(La) 1)
CuLa-99Du.tdb	1146.62	FCC_A1 (x(La) 0) + CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.08731)
CuLa-99Du.tdb	1146.62	FCC_A1 (x(La) 0) + CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.08714)
CuLa-99Du.tdb	1134.84	CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.09638) + CU6LA_B (x(La) 0.14286)
CuLa-99Du.tdb	1134.84	CU37LA3_D23 (x(La) 0.075) + LIQUID (x(La) 0.09632) + CU6LA_B (x(La) 0.14286)
CuLa-99Du.tdb	1134	LIQUID (x(La) 0.96733) + FCC_A1 (x(La) 1) + BCC_A2 (x(La) 1)
CuLa-99Du.tdb	1092.77	FCC_A1 (x(La) 0) + CU37LA3_D23 (x(La) 0.075) + CU6LA_B (x(La) 0.14286)
CuLa-99Du.tdb	1072.48	CU6LA_B (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.21734)
CuLa-99Du.tdb	1072.48	CU6LA_B (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667) + LIQUID (x(La) 0.21747)
CuLa-99Du.tdb	1014.78	CU5LA_D2D (x(La) 0.16667) + CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24185)
CuLa-99Du.tdb	1014.78	CU5LA_D2D (x(La) 0.16667) + CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24176)
CuLa-99Du.tdb	1014.78	CU5LA_D2D (x(La) 0.16667) + CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24193)
CuLa-99Du.tdb	1011.23	CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24458) + CU2LA_C32 (x(La) 0.33333)
CuLa-99Du.tdb	1011.23	CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24451) + CU2LA_C32 (x(La) 0.33333)
CuLa-99Du.tdb	1011.23	CU4LA (x(La) 0.2) + LIQUID (x(La) 0.24466) + CU2LA_C32 (x(La) 0.33333)
CuLa-99Du.tdb	798.58	CU2LA_C32 (x(La) 0.33333) + CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.59093)
CuLa-99Du.tdb	798.58	CU2LA_C32 (x(La) 0.33333) + CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.59064)
CuLa-99Du.tdb	747.99	CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.71222) + FCC_A1 (x(La) 1)
CuLa-99Du.tdb	747.98	CULA_B27 (x(La) 0.5) + LIQUID (x(La) 0.71203) + FCC_A1 (x(La) 1)
CuLa-99Du.tdb	550	CULA_B27 (x(La) 0.5) + DHCP (x(La) 1) + FCC_A1 (x(La) 1)
CuLa-99Du.tdb	500.05	CU6LA_B (x(La) 0.14286) + CU6LA_A (x(La) 0.14286) + CU5LA_D2D (x(La) 0.16667)
CuLa-99Du.tdb	500.05	FCC_A1 (x(La) 0) + CU6LA_A (x(La) 0.14286) + CU6LA_B (x(La) 0.14286)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CuLa-89Qi · CALPHAD hull CuLa-99Du

Invariant reactions (literature)

Invariant reactions reported in the literature for the Cu–La system (19)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1147	liq.+f.c.c.(Cu)->Cu37La3	L: La 0.0873; Cu37La3: La 0.075	model	[1] Du 1999	Table 2, p. 4, row 1 report
1146	liq.+f.c.c.(Cu)->Cu37La3	L: La 0.088; Cu37La3: La 0.075	experimental	[1] Du 1999 cites Meyer-Liautaud 1985 doi	Table 2, p. 4, row 2 report
1138	eutectic: liq.->Cu6La+f.c.c.(Cu)	L: La 0.009; Cu6La: La 0.142857	experimental	[1] Du 1999 cites Cirafici 1977 doi	Table 2, p. 4, row 5 report
1137	eutectic: liq.->Cu6La+f.c.c.(Cu)	L: La 0.009; Cu6La: La 0.142857	experimental	[1] Du 1999 cites Meyer-Liautaud 1985 doi	Table 2, p. 4, row 4 report
1135	eutectic: liq.->Cu37La3+βCu6La	L: La 0.0963; Cu37La3: La 0.075; βCu6La: La 0.142857	model	[1] Du 1999	Table 2, p. 4, row 3 report
1093	Cu37La3->f.c.c.(Cu)+βCu6La	Cu37La3: La 0.075; βCu6La: La 0.142857	experimental	[1] Du 1999 cites Meyer-Liautaud 1985 doi	Table 2, p. 4, row 7 report
1093	Cu37La3->f.c.c.(Cu)+βCu6La	Cu37La3: La 0.075; βCu6La: La 0.142857	model	[1] Du 1999	Table 2, p. 4, row 6 report
1078	liq.+Cu6La->Cu5La	L: La 0.218; Cu6La: La 0.142857; Cu5La: La 0.166667	experimental	[1] Du 1999 cites Cirafici 1977 doi	Table 2, p. 4, row 15 report
1073	liq.+Cu6La->Cu5La	L: La 0.22; Cu6La: La 0.142857; Cu5La: La 0.166667	experimental	[1] Du 1999 cites Meyer-Liautaud 1985 doi	Table 2, p. 4, row 14 report
1073	liq.+βCu6La->Cu5La	L: La 0.2175; βCu6La: La 0.142857; Cu5La: La 0.166667	model	[1] Du 1999	Table 2, p. 4, row 13 report
1018	eutectic: liq.->Cu2La+Cu5La	L: La 0.245; Cu2La: La 0.333333; Cu5La: La 0.166667	experimental	[1] Du 1999 cites Cirafici 1977 doi	Table 2, p. 4, row 20 report
1016	liq.+Cu5La->Cu4La	L: La 0.251; Cu5La: La 0.166667; Cu4La: La 0.2	experimental	[1] Du 1999 cites Meyer-Liautaud 1985 doi	Table 2, p. 4, row 17 report
1015	liq.+Cu5La->Cu4La	L: La 0.2418; Cu5La: La 0.166667; Cu4La: La 0.2	model	[1] Du 1999	Table 2, p. 4, row 16 report
1011	eutectic: liq.->Cu2La+Cu4La	L: La 0.2446; Cu2La: La 0.333333; Cu4La: La 0.2	model	[1] Du 1999	Table 2, p. 4, row 18 report
1008	eutectic: liq.->Cu2La+Cu4La	L: La 0.255; Cu2La: La 0.333333; Cu4La: La 0.2	experimental	[1] Du 1999 cites Meyer-Liautaud 1985 doi	Table 2, p. 4, row 19 report
798	liq.+Cu2La->CuLa	L: La 0.5909; Cu2La: La 0.333333; CuLa: La 0.5	model	[1] Du 1999	Table 2, p. 4, row 23 report
798	liq.+Cu2La->CuLa	L: La 0.6; Cu2La: La 0.333333; CuLa: La 0.5	experimental	[1] Du 1999 cites Cirafici 1977 doi	Table 2, p. 4, row 24 report
748	eutectic: liq.->CuLa+f.c.c.(La)	L: La 0.712; CuLa: La 0.5	model	[1] Du 1999	Table 2, p. 4, row 25 report
748	eutectic: liq.->CuLa+f.c.c.(La)	L: La 0.71; CuLa: La 0.5	experimental	[1] Du 1999 cites Cirafici 1977 doi	Table 2, p. 4, row 26 report

Other properties

Phase transition (9)

Phase transition, Cu–La system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	500 K	500	αCu6La->βCu6La αCu6La: La 0.142857; βCu6La: La 0.142857	model	[1] Du 1999	Table 2, p. 4, row 11 report
Phase transition	500 K	500	αCu6La->βCu6La αCu6La: La 0.142857; βCu6La: La 0.142857	experimental	[1] Du 1999 cites Yamada 1987 doi	Table 2, p. 4, row 12 report
Phase transition	1102 K	1102	Cu2La	experimental	[1] Du 1999 cites Qi 1989	p. 4 report	Fig. 6a and b presents the enthalpies and entropies of fusion of two compounds Cu 2 La and Cu 6 La at their melting temperature 1102 and 1194 K with the experimental data [11-14], respectively.
Phase transition	1102 K	1102	liq.->Cu2La L: La 0.3333; Cu2La: La 0.333333	model	[1] Du 1999	Table 2, p. 4, row 21 report
Phase transition	1103 K	1103	liq.->Cu2La L: La 0.3333; Cu2La: La 0.333333	experimental	[1] Du 1999 cites Cirafici 1977 doi	Table 2, p. 4, row 22 report
Phase transition	1178 K	1178	liq.->Cu6La L: La 0.1429; Cu6La: La 0.142857	experimental	[1] Du 1999 cites Cirafici 1977 doi	Table 2, p. 4, row 10 report
Phase transition	1193 K	1193	liq.->Cu6La L: La 0.1429; Cu6La: La 0.142857	experimental	[1] Du 1999 cites Meyer-Liautaud 1985 doi	Table 2, p. 4, row 9 report
Phase transition	1194 K	1194	Cu6La	experimental	[1] Du 1999 cites Qi 1989	p. 4 report	Fig. 6a and b presents the enthalpies and entropies of fusion of two compounds Cu 2 La and Cu 6 La at their melting temperature 1102 and 1194 K with the experimental data [11-14], respectively.
Phase transition	1194 K	1194	liq.->βCu6La L: La 0.1429; βCu6La: La 0.142857	model	[1] Du 1999	Table 2, p. 4, row 8 report

Crystal structure (12)

Crystal structure, Cu–La system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	8.165 Å		β-LaCu6 alloy: La 0.142857	unspecified	[2] An 2012	Table 2, p. 5, row 23 report
Lattice a	7.543 Å	298.15	LaCu alloy: La 0.5	unspecified	[2] An 2012	Table 2, p. 5, row 16 report
Lattice a	4.346 Å	298.15	LaCu2 alloy: La 0.333333	unspecified	[2] An 2012	Table 2, p. 5, row 17 report
Lattice a	5.189 Å	298.15	LaCu5 alloy: La 0.166667	unspecified	[2] An 2012	Table 2, p. 5, row 19 report
Lattice a	5.143 Å	298.15	α-LaCu6 alloy: La 0.142857	unspecified	[2] An 2012	Table 2, p. 5, row 18 report
Lattice a	5.1467 Å	298.15	α-LaCu6 alloy: La 0.142857	unspecified	[2] An 2012	Table 2, p. 5, row 22 report
Lattice c	10.23 Å		β-LaCu6 alloy: La 0.142857	unspecified	[2] An 2012	Table 2, p. 5, row 23 report
Lattice c	5.724 Å	298.15	LaCu alloy: La 0.5	unspecified	[2] An 2012	Table 2, p. 5, row 16 report
Lattice c	3.807 Å	298.15	LaCu2 alloy: La 0.333333	unspecified	[2] An 2012	Table 2, p. 5, row 17 report
Lattice c	4.107 Å	298.15	LaCu5 alloy: La 0.166667	unspecified	[2] An 2012	Table 2, p. 5, row 19 report
Lattice c	8.144 Å	298.15	α-LaCu6 alloy: La 0.142857	unspecified	[2] An 2012	Table 2, p. 5, row 18 report
Lattice c	8.146 Å	298.15	α-LaCu6 alloy: La 0.142857	unspecified	[2] An 2012	Table 2, p. 5, row 22 report

Sources

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

Zhenmin Du, Yunhua Xu, Weijing Zhang, Thermodynamic assessment of the Cu–La system, Journal of Alloys and Compounds 289, 88-95 (1999). doi:10.1016/s0925-8388(99)00080-8
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-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}
}