C–Hf–Zr system

51 accepted literature values from 1 paper(s) (experimental 27, model 12, unspecified 12); 0 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

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Accepted values by evidence class
Evidence class	Values
experimental	27
model	12
unspecified	12

Accepted values by property group
Property group	Values
invariant reaction	11
crystal structure	40

Invariant reactions (literature)

Invariant reactions reported in the literature for the C–Hf–Zr system (11)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
4215	congruent melting: l <-> HfC1-x	HfC1-x: C 0.4844; l: C 0.4844; 1: C 0.4844; HfC1−x: C 0.4844	model	[1] Bittermann 2002 cites Bittermann 2002	Table 2, p. 5, row 7 report
3694	congruent melting: l <-> ZrC1-x	ZrC1-x: C 0.4597; l: C 0.4597; 1: C 0.4597; ZrC1−x: C 0.4597	model	[1] Bittermann 2002 cites Fernandez 1995 doi	Table 2, p. 5, row 1 report
3446	eutectic: l <-> HfC1-x + C	HfC1-x: C 0.4987; C: C 1; l: C 0.6803; 1: C 0.6803; HfC1−x: C 0.4987	model	[1] Bittermann 2002 cites Bittermann 2002	Table 2, p. 5, row 8 report
3200	eutectic: l <-> ZrC1-x + C	ZrC1-x: C 0.4948; C: C 1; l: C 0.6757; 1: C 0.6757; ZrC1−x: C 0.4948	model	[1] Bittermann 2002 cites Fernandez 1995 doi	Table 2, p. 5, row 2 report
2649	peritectic: l + HfC1-x <-> (αHf)	HfC1-x: C 0.3348; (αHf): C 0.1398; l: C 0.0602; 1: C 0.0602; HfC1−x: C 0.3348	model	[1] Bittermann 2002 cites Bittermann 2002	Table 2, p. 5, row 9 report
2506	congruent melting: l <-> βHf	βHf: C 0; l: C 0; 1: C 0	model	[1] Bittermann 2002 cites Bittermann 2002	Table 2, p. 5, row 10 report
2480	eutectic: l <-> (βHf) + (αHf)	(βHf): C 0.005; (αHf): C 0.0293; l: C 0.0137; 1: C 0.0137	model	[1] Bittermann 2002 cites Bittermann 2002	Table 2, p. 5, row 11 report
2324	quasi-peritectic: α(Hf,Zr)(C) + L ↔ β(Hf,Zr)(C) + (Hf,Zr)C1−x	α(Hf,Zr)(C): C 0.0361, Hf 0.7301, Zr 0.2338; L: C 0.017, Hf 0.6426, Zr 0.3404; β(Hf,Zr)(C): C 0.0049, Hf 0.6914, Zr 0.3037; (Hf,Zr)C1−x: C 0.3355, Hf 0.5295, Zr 0.135; (Hf,Zr)C1-x: C 0.3355, Hf 0.5295, Zr 0.135	model	[1] Bittermann 2002	Table 3, p. 12, row 1 report
2303	quasi-peritectic: α(Hf,Zr)(C) + L ↔ β(Hf,Zr)(C) + (Hf,Zr)C1−x	α(Hf,Zr)(C): C 0.085, Hf 0.685, Zr 0.23; L: C 0.015, Hf 0.635, Zr 0.35; β(Hf,Zr)(C): C 0.005, Hf 0.64, Zr 0.355; (Hf,Zr)C1−x: C 0.375, Hf 0.535, Zr 0.09; (Hf,Zr)C1-x: C 0.375, Hf 0.535, Zr 0.09	experimental	[1] Bittermann 2002 cites ref. 1996Bru	Table 3, p. 12, row 2 report
2128	congruent melting: l <-> βZr	βZr: C 0; l: C 0; 1: C 0	model	[1] Bittermann 2002 cites Fernandez 1995 doi	Table 2, p. 5, row 3 report
2127	eutectic: l <-> (βZr) + ZrC1-x	(βZr): C 0.0053; ZrC1-x: C 0.3591; l: C 0.006; 1: C 0.006; ZrC1−x: C 0.3591	model	[1] Bittermann 2002 cites Fernandez 1995 doi	Table 2, p. 5, row 4 report

Other properties

Crystal structure (40)

Crystal structure, C–Hf–Zr system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	4.647 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.274725, Zr 0.274725	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 4 report
Lattice a	4.668 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.26738, Zr 0.26738	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 5 report
Lattice a	4.652 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.408163, Zr 0.102041	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 3 report
Lattice a	4.684 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.10989, Zr 0.43956	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 7 report
Lattice a	4.651 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.427807, Zr 0.106952	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 2 report
Lattice a	4.67 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.255102, Zr 0.255102	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 6 report
Lattice a	4.689 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.106952, Zr 0.427807	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 8 report
Lattice a	4.691 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.102041, Zr 0.408163	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 9 report
Lattice a	4.647 Å	298.15	(HfyZr1-y)C1-x alloy: Hf 0.43956, Zr 0.10989	unspecified	[1] Bittermann 2002 cites Bittermann 2002	Table 1, p. 5, row 1 report
Lattice a	3.231 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.052	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 4 report
Lattice a	3.209 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.429	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 6 report
Lattice a	3.202 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.713	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 7 report
Lattice a	3.219 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.211	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 5 report
Lattice a	3.211 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.618	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 11 report
Lattice a	3.199 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.965	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 12 report
Lattice a	3.231 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.012	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 10 report
Lattice a	3.231 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 9 report
Lattice a	3.226 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 3 report
Lattice a	5.008 Å	298.15	ω(HfxZr1−x)	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 12 report
Lattice a	5.021 Å	298.15	ω(HfxZr1−x)	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 11 report
Lattice a	5.035 Å	298.15	ω(HfxZr1−x) alloy: Hf 0	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 10 report
Lattice a	4.991 Å	298.15	ω(HfxZr1−x)	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 13 report
Lattice a	4.691 Å	3427 (<)	ZrC1-x ZrC1-x: C 0.35	unspecified	[1] Bittermann 2002 cites Storms 1967	Table 1, p. 4, row 18 report
Lattice a	4.7017 Å	3540 (<)	ZrC1-x ZrC1-x: C 0.46	unspecified	[1] Bittermann 2002 cites Storms 1967	Table 1, p. 4, row 17 report
Lattice a	2.4612 Å	3827 (<)	(C) alloy: Hf 0, Zr 0	model	[1] Bittermann 2002 cites Massalski 1990	Table 1, p. 4, row 16 report
Lattice a	4.606 Å	3950 (<)	HfC1-x HfC1-x: C 0.34	unspecified	[1] Bittermann 2002 cites ref. 1969Rud	Table 1, p. 4, row 20 report
Lattice c	5.134 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.052	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 4 report
Lattice c	5.126 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.429	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 6 report
Lattice c	5.106 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.713	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 7 report
Lattice c	5.115 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.211	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 5 report
Lattice c	5.098 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.618	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 11 report
Lattice c	5.066 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.965	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 12 report
Lattice c	5.146 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0.012	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 10 report
Lattice c	5.148 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0	experimental	[1] Bittermann 2002 cites Russell 1953 doi	Table 1, p. 4, row 9 report
Lattice c	5.146 Å	298.15	α(HfxZr1-x) α(HfxZr1-x): Hf 0	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 4, row 3 report
Lattice c	3.107 Å	298.15	ω(HfxZr1−x)	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 12 report
Lattice c	3.119 Å	298.15	ω(HfxZr1−x)	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 11 report
Lattice c	3.141 Å	298.15	ω(HfxZr1−x) alloy: Hf 0	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 10 report
Lattice c	3.093 Å	298.15	ω(HfxZr1−x)	experimental	[1] Bittermann 2002 cites Ming 1981 doi	Table 1, p. 5, row 13 report
Lattice c	6.709 Å	3827 (<)	(C) alloy: Hf 0, Zr 0	model	[1] Bittermann 2002 cites Massalski 1990	Table 1, p. 4, row 16 report

Sources

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

H. Bittermann, P. Rogl, Critical assessment and thermodynamic calculation of the ternary system C-Hf-Zr (Carbon-Zirconium-Hafnium), JPE 23, 218-235 (2002). doi:10.1361/105497102770331703

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}
}