Cr2Nb: enthalpy of formation

6 accepted literature formation-enthalpy value(s) (experimental 1, model 1, DFT 2, unspecified 2).

Literature values

Enthalpy of formation of Cr2Nb reported in the literature (6)
Value	Phase as printed	T (K)	Class	Method	System	Source	Location
-7 kJ/mol (basis unstated)	Cr2Nb C14	298.15	experimental	Experiment	Cr–Nb	[1] Pavlů 2009 cites Martin 1970 doi	Table 4, p. 4, row 4 report
-9.93 kJ/mol (basis unstated)	C15 Cr2Nb	0	model		Cr–Nb	[2] Schmetterer 2014 cites Pavlu 2009 doi	Table 5, p. 6, row 1 report
-7.44 kJ/mol (basis unstated)	C15 Cr2Nb	0	DFT		Cr–Nb	[2] Schmetterer 2014 cites Hong 1999 doi	Table 5, p. 6, row 2 report
-6.93 kJ/mol (basis unstated)	C15 Cr2Nb	0	DFT		Cr–Nb	[2] Schmetterer 2014 cites Yao 2006	Table 5, p. 6, row 3 report
-7.02 kJ/mol (basis unstated)	C15 Cr2Nb	0	unspecified		Cr–Nb	[2] Schmetterer 2014 cites Ormeci 1996 doi	Table 5, p. 6, row 5 report
-6.3 kJ/mol (basis unstated)	C15 Cr2Nb	0	unspecified		Cr–Nb	[2] Schmetterer 2014 cites Kellou 2005	Table 5, p. 6, row 4 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 Cr2Nb
Value	Unit	Reading	Method (class, basis)	Effective
-7	kJ/mol (basis unstated)	0.5	12.3 (experimental_unspecified, cleaned_below_threshold)	12.3
-9.93	kJ/mol (basis unstated)	0.005	11.7 (model_calculated, calibrated)	11.7
-7.44	kJ/mol (basis unstated)	0.005	11.79 (dft, calibrated)	11.79
-6.93	kJ/mol (basis unstated)	0.005	11.79 (dft, calibrated)	11.79
-7.02	kJ/mol (basis unstated)	0.005	10.5 (unknown, calibrated)	10.5
-6.3	kJ/mol (basis unstated)	0.05	10.5 (unknown, calibrated)	10.5

Sources

J. Pavlů, J. Vřešt’ál, M. Šob, Re-modeling of Laves phases in the Cr–Nb and Cr–Ta systems using first-principles results, Calphad 33, 179-186 (2009). doi:10.1016/j.calphad.2008.04.006
Clemens Schmetterer, Alexandra Khvan, Aurélie Jacob, Bengt Hallstedt, Torsten Markus, A New Theoretical Study of the Cr-Nb System, J. Phase Equilib. Diffus. 35, 434-444 (2014). doi:10.1007/s11669-014-0313-y

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}
}