NiZr2: enthalpy of formation

10 accepted literature formation-enthalpy value(s) (experimental 3, model 4, DFT 3); experimental median -31.2 kJ/mol-atom (n = 3); Materials Project -31.171 kJ/mol-atom (mp-aaaaaamq); OQMD -31.327 kJ/mol-atom (oqmd-103369).

Systems: Ni–Zr

Literature values

Enthalpy of formation of NiZr2 reported in the literature (10)
Value	Phase as printed	T (K)	Class	Method	System	Source	Location
-37.24 kJ/mol-atom ± 6.11	NiZr2	298.15	experimental	experimental	Ni–Zr	[1] Jana 2020 cites Henaff 1984 doi	Table 6, p. 7, row 65 report
-31.2 kJ/mol-atom ± 0.9	NiZr2	298.15	experimental	experimental	Ni–Zr	[1] Jana 2020 cites Guo 1998 doi	Table 6, p. 7, row 66 report
-30.7 kJ/mol-atom ± 2	NiZr2	298.15	experimental	experimental	Ni–Zr	[1] Jana 2020 cites Zaitsev 2002 doi	Table 6, p. 7, row 64 report
-37.288 kJ/mol-atom	NiZr2		model	empirical	Ni–Zr	[1] Jana 2020 cites Zhang 2007 doi	Table 6, p. 7, row 68 report
-35 kJ/mol-atom	NiZr2		model	empirical	Ni–Zr	[1] Jana 2020 cites Colinet 1985 doi	Table 6, p. 7, row 67 report
-34.034 kJ/mol-atom	NiZr2		model		Ni–Zr	[1] Jana 2020	Table 6, p. 7, row 72 report
-31.852 kJ/mol-atom	NiZr2		model		Ni–Zr	[1] Jana 2020	Table 6, p. 7, row 73 report
-33.917 kJ/mol-atom	NiZr2		DFT	DFT	Ni–Zr	[1] Jana 2020 cites Du 2014 doi	Table 6, p. 7, row 71 report
-31.84 kJ/mol-atom	NiZr2		DFT	DFT	Ni–Zr	[1] Jana 2020 cites Hennig 2005 doi	Table 6, p. 7, row 70 report
-31.358 kJ/mol-atom	NiZr2		DFT	DFT	Ni–Zr	[1] Jana 2020 cites Kirklin	Table 6, p. 7, row 69 report

Uncertainty budget

Components kept separate, in the value's unit (literature SCHEMA.md, UNCERTAINTY_CALIBRATION.md): effective = max(sqrt(max(printed, reading, method)^2 + composition^2 + conversion^2), scatter). The method floor is the robust between-study scatter of the method class in ORCHID (calibrated) or a documented prior; printed values and printed uncertainties are unchanged.

Uncertainty budget of the literature values of NiZr2
Value	Unit	Printed	Reading	Method (class, basis)	Effective
-37.24	kJ/mol-atom	6.11	5.000e-5	4.1 (experimental_unspecified, cleaned_below_threshold)	6.11
-31.2	kJ/mol-atom	0.9	5.000e-5	4.1 (experimental_unspecified, cleaned_below_threshold)	4.1
-30.7	kJ/mol-atom	2	5.000e-5	4.1 (experimental_unspecified, cleaned_below_threshold)	4.1
-37.288	kJ/mol-atom		5.000e-5	3.9 (model_calculated, calibrated)	3.9
-35	kJ/mol-atom		5.000e-5	3.9 (model_calculated, calibrated)	3.9
-34.034	kJ/mol-atom		5.000e-5	3.9 (model_calculated, calibrated)	3.9
-31.852	kJ/mol-atom		5.000e-5	3.9 (model_calculated, calibrated)	3.9
-33.917	kJ/mol-atom		5.000e-5	3.929 (dft, calibrated)	3.929
-31.84	kJ/mol-atom		5.000e-5	3.929 (dft, calibrated)	3.929
-31.358	kJ/mol-atom		5.000e-5	3.929 (dft, calibrated)	3.929

DFT formation energies

Lowest-energy entries at this composition. Materials Project and OQMD use different energy references and are never averaged. 1 eV/atom = 96.485 kJ/mol-atom.

DFT formation energy of NiZr2
Source	Entry	kJ/mol-atom	eV/atom	Space group	E above hull (kJ/mol-atom)	E above hull (eV/atom)	Theoretical
Materials Project	mp-aaaaaamq	-31.171	-0.323065	I4/mcm	0	0	no
OQMD	oqmd-103369	-31.327	-0.324686	I4/mcm	0	0	no

DFT sources: A. Jain et al., Commentary: The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002. doi:10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501-1509; S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010. doi:10.1007/s11837-013-0755-4 (CC BY 4.0);

Sources

Asmita Jana, Soumya Sridar, Suzana G. Fries, Thomas Hammerschmidt, K.C. Hari Kumar, Thermodynamic modelling of the Ni–Zr system, Intermetallics 116, 106640 (2020). doi:10.1016/j.intermet.2019.106640

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-Parity: DFT-vs-experiment formation-enthalpy benchmark (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735943
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); G. Kim, S. V. Meschel, P. Nash, W. Chen, Experimental formation enthalpies for intermetallic phases and other inorganic compounds, Scientific Data 4 (2017) 170162, https://doi.org/10.1038/sdata.2017.162; 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_dft_benchmark_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Parity: DFT-vs-experiment formation-enthalpy benchmark}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735943},
  url       = {https://doi.org/10.5281/zenodo.23735943},
  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}
}