V–Zn system

19 accepted literature values from 2 paper(s) (experimental 12, model 4, unspecified 3); 2 calculated phase diagram(s). 9 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 (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	12
model	4
unspecified	3

Accepted values by property group
Property group	Values
invariant reaction	7
phase transition	2
formation	1
crystal structure	9

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
VZn-10Cha.tdb	K. Chang, Y. Du, W. Sun, H. Xu, L.C. Zhou, Calphad, 34, 75-80(2010). doi:10.1016/j.calphad.2009.12.003	`d4533862db93cd15d8b0278ac566b0641974dc5251df68dc48fbd8986e2b27b4`	viewer · TDB · JSON
VZn-11Wu.tdb	C. Wu, X. Su, D. Liu, X. Wang, J. Wang, Z. Li, H. Peng, Calphad, 35, 403-10(2011). doi:10.1016/j.calphad.2011.05.005	`8818a90f31db30691288fcd0a84ae8fdf51c26dcb9fb302676c8ca8a18401f69`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
VZn-10Cha.tdb	2183.33	LIQUID (x(Zn) 4.000e-5) + BCC_A2 (x(Zn) 2.200e-4) + GAS (x(Zn) 0.99998)
VZn-10Cha.tdb	1180.6	BCC_A2 (x(Zn) 0.00635) + LIQUID (x(Zn) 0.99089) + GAS (x(Zn) 1)
VZn-10Cha.tdb	1180.6	BCC_A2 (x(Zn) 0.00635) + LIQUID (x(Zn) 0.99089) + GAS (x(Zn) 1)
VZn-10Cha.tdb	943.15	BCC_A2 (x(Zn) 0.00218) + V4ZN5 (x(Zn) 0.55556) + LIQUID (x(Zn) 0.99034)
VZn-10Cha.tdb	943.15	BCC_A2 (x(Zn) 0.00217) + V4ZN5 (x(Zn) 0.55556) + LIQUID (x(Zn) 0.99034)
VZn-10Cha.tdb	896.13	V4ZN5 (x(Zn) 0.55556) + VZN3_L12 (x(Zn) 0.75) + LIQUID (x(Zn) 0.99149)
VZn-10Cha.tdb	896.13	V4ZN5 (x(Zn) 0.55556) + VZN3_L12 (x(Zn) 0.75) + LIQUID (x(Zn) 0.99148)
VZn-10Cha.tdb	896.13	V4ZN5 (x(Zn) 0.55556) + VZN3_L12 (x(Zn) 0.75) + LIQUID (x(Zn) 0.99149)
VZn-10Cha.tdb	691.85	VZN3_L12 (x(Zn) 0.75) + LIQUID (x(Zn) 0.99823) + HCP_A3 (x(Zn) 0.99975)
VZn-11Wu.tdb	2183.06	LIQUID (x(Zn) 5.000e-5) + BCC_A2 (x(Zn) 8.000e-5) + GAS (x(Zn) 0.99998)
VZn-11Wu.tdb	1180.58	BCC_A2 (x(Zn) 0.02327) + LIQUID (x(Zn) 0.99113) + GAS (x(Zn) 1)
VZn-11Wu.tdb	1180.58	BCC_A2 (x(Zn) 0.02326) + LIQUID (x(Zn) 0.99113) + GAS (x(Zn) 1)
VZn-11Wu.tdb	924.3	BCC_A2 (x(Zn) 0.02892) + V4ZN5 (x(Zn) 0.55556) + LIQUID (x(Zn) 0.99131)
VZn-11Wu.tdb	924.3	BCC_A2 (x(Zn) 0.02893) + V4ZN5 (x(Zn) 0.55556) + LIQUID (x(Zn) 0.99131)
VZn-11Wu.tdb	893.24	V4ZN5 (x(Zn) 0.55556) + VZN3_L12 (x(Zn) 0.75) + LIQUID (x(Zn) 0.99211)
VZn-11Wu.tdb	893.24	V4ZN5 (x(Zn) 0.55556) + VZN3_L12 (x(Zn) 0.75) + LIQUID (x(Zn) 0.99211)
VZn-11Wu.tdb	893.24	V4ZN5 (x(Zn) 0.55556) + VZN3_L12 (x(Zn) 0.75) + LIQUID (x(Zn) 0.99211)
VZn-11Wu.tdb	700.54	VZN3_L12 (x(Zn) 0.75) + VZN16 (x(Zn) 0.94118) + LIQUID (x(Zn) 0.99834)
VZn-11Wu.tdb	700.54	VZN3_L12 (x(Zn) 0.75) + VZN16 (x(Zn) 0.94118) + LIQUID (x(Zn) 0.99834)
VZn-11Wu.tdb	700.54	VZN3_L12 (x(Zn) 0.75) + VZN16 (x(Zn) 0.94118) + LIQUID (x(Zn) 0.99833)
VZn-11Wu.tdb	692.01	VZN16 (x(Zn) 0.94118) + LIQUID (x(Zn) 0.99877) + HCP_A3 (x(Zn) 0.99999)
VZn-11Wu.tdb	692.01	VZN16 (x(Zn) 0.94118) + LIQUID (x(Zn) 0.99877) + HCP_A3 (x(Zn) 0.99999)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull VZn-10Cha

Invariant reactions (literature)

Invariant reactions reported in the literature for the V–Zn system (7)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
943.15	L + (V) -> V4Zn5	L: Zn 0.9903; V4Zn5: V 0.444444, Zn 0.555556	model	[1] Chang 2010	Table 2, p. 2, row 2 report
943.15	L + (V) -> V4Zn5	L: Zn 0.9904; V4Zn5: V 0.444444, Zn 0.555556	experimental	[1] Chang 2010 cites Chasanov 1963	Table 2, p. 2, row 1 report
896.15	L + V4Zn5 -> VZn3	L: Zn 0.9915; V4Zn5: V 0.444444, Zn 0.555556; VZn3: V 0.25, Zn 0.75	model	[1] Chang 2010	Table 2, p. 2, row 4 report
896.15	L + V4Zn5 -> VZn3	L: Zn 0.9915; V4Zn5: V 0.444444, Zn 0.555556; VZn3: V 0.25, Zn 0.75	experimental	[1] Chang 2010 cites Chasanov 1963	Table 2, p. 2, row 3 report
700.15	peritectic: VZn3 + Liq. → VZn16		experimental	[2] Wu 2011	p. 3 report	Therefore, it was believed that the peritectic reaction temperature of VZn3 + Liq. → VZn16 was around 427 °C.
691.85	eutectic: L -> VZn3 + (Zn)	L: Zn 0.99823; VZn3: V 0.25, Zn 0.75	model	[1] Chang 2010	Table 2, p. 2, row 6 report
690.45	eutectic: L -> VZn3 + (Zn)	L: Zn 0.99828; VZn3: V 0.25, Zn 0.75	experimental	[1] Chang 2010 cites Chasanov 1963	Table 2, 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, V–Zn system (1)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location	Quote
VZn16		-1.1 kJ/mol (basis unstated)	298.15	model			[2] Wu 2011	p. 7 report	The formation enthalpy of VZn16 was given a small value of -1100 J/mol at 298 K by considering the difficulty of its formation.

Other properties

Phase transition (2)

Phase transition, V–Zn system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	894.15 K	894.15	VZn3	experimental	[2] Wu 2011	p. 3 report	From the DTA test results of some V-Zn alloys with heating rate of 3 °C/min, it can be determined that the transformation temperature for VZn3 is 621 °C, which agrees well with Chasanov's results [5].
Phase transition	924.15 K	924.15	V4Zn5	experimental	[2] Wu 2011	p. 3 report	The transformation temperature for V4 Zn5 is 651 °C, which is 18 °C lower than Chasanov's results [5].

Crystal structure (9)

Crystal structure, V–Zn system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	0.8872 Å		V4Zn5 alloy: Zn 0.555556	unspecified	[1] Chang 2010	Table 1, p. 2, row 7 report
Lattice a	0.3823 Å		VZn3 alloy: Zn 0.75	unspecified	[1] Chang 2010	Table 1, p. 2, row 10 report
Lattice a	0.891 Å	298.15	V4Zn5 alloy: Zn 0.555556	experimental	[1] Chang 2010 cites Piotrowski 1965	Table 1, p. 2, row 6 report
Lattice a	0.891 Å	298.15	V4Zn5 alloy: Zn 0.555556	experimental	[1] Chang 2010 cites Chasanov 1963	Table 1, p. 2, row 5 report
Lattice a	0.3848 Å	298.15	VZn3 alloy: Zn 0.75	experimental	[1] Chang 2010 cites Chasanov 1963	Table 1, p. 2, row 8 report
Lattice a	0.3849 Å	298.15	VZn3 alloy: Zn 0.75	experimental	[1] Chang 2010 cites Wendorff 1964	Table 1, p. 2, row 9 report
Lattice c	0.3196 Å		V4Zn5 alloy: Zn 0.555556	unspecified	[1] Chang 2010	Table 1, p. 2, row 7 report
Lattice c	0.322 Å	298.15	V4Zn5 alloy: Zn 0.555556	experimental	[1] Chang 2010 cites Piotrowski 1965	Table 1, p. 2, row 6 report
Lattice c	0.3227 Å	298.15	V4Zn5 alloy: Zn 0.555556	experimental	[1] Chang 2010 cites Chasanov 1963	Table 1, p. 2, row 5 report

Sources

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

Keke Chang, Yong Du, Weihua Sun, Honghui Xu, LiangCai Zhou, Thermodynamic assessment of the V–Zn system supported by key experiments and first-principles calculations, Calphad 34, 75-80 (2010). doi:10.1016/j.calphad.2009.12.003
Changjun Wu, Xuping Su, Daniel Liu, Xinming Wang, Jianhua Wang, Zhi Li et al., The V–Zn binary system: New experimental results and thermodynamic assessment, Calphad 35, 403-410 (2011). doi:10.1016/j.calphad.2011.05.005

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}
}