N–Nb system

8 accepted literature values from 1 paper(s) (experimental 4, model 4); 0 calculated phase diagram(s). 7 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (5) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	4
model	4

Accepted values by property group
Property group	Values
phase transition	3
heat capacity / entropy / enthalpy	4
other property	1

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull NbN-09Hal · CALPHAD hull NbN-96Hua-LB

Other properties

Phase transition (3)

Phase transition, N–Nb system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	2303 K	2303	NbN + liquid	experimental	[1] Huang 1996 cites Friederich 1925 doi	p. 1 report	The NbN nitride was found to melt at 2303 K by Friederich and Sitting.[15]
Phase transition	2742 K	2742	Nb + liquid	experimental	[1] Huang 1996	p. 2 report	(The melting point of Nb is now accepted to be 2742 K.)
Phase transition	2743 K	2743	liquid	experimental	[1] Huang 1996	p. 5 report	The temperature of the sample was taken as the melting point of niobium, 2743 K.

Heat capacity / entropy / enthalpy (4)

Heat capacity / entropy / enthalpy, N–Nb system
Property	Value	T (K)	Class	Source	Location	Quote
Entropy printed: 7S298	37.7 unspecified ± 2	298.15	experimental	[1] Huang 1996	p. 4 report	The estimated entropy at 298 K[34] for NbN ranges from 7S298 5 37.7 by Kelley and King[48] and 47.7 by Schick[34] to 52.7 J/Kzmole of NbN by Kaufman.[49]
Entropy printed: 7S298	52.7 J/Kzmole	298.15	model	[1] Huang 1996 cites Kaufman 1962	p. 4 report	The estimated entropy at 298 K[34] for NbN ranges from 7S298 5 37.7 by Kelley and King[48] and 47.7 by Schick[34] to 52.7 J/Kzmole of NbN by Kaufman.[49]
Entropy printed: 7S298	37.7 J/Kzmole	298.15	model	[1] Huang 1996 cites Kelley 1961	p. 4 report	The estimated entropy at 298 K[34] for NbN ranges from 7S298 5 37.7 by Kelley and King[48] and 47.7 by Schick[34] to 52.7 J/Kzmole of NbN by Kaufman.[49]
Entropy printed: 7S298	47.7 J/Kzmole	298.15	model	[1] Huang 1996 cites Schick 1966	p. 4 report	The estimated entropy at 298 K[34] for NbN ranges from 7S298 5 37.7 by Kelley and King[48] and 47.7 by Schick[34] to 52.7 J/Kzmole of NbN by Kaufman.[49]

Other property (1)

Other property, N–Nb system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Other printed: D7H	1 unspecified ± 1	1643		model	[1] Huang 1996 cites Schick 1966	p. 8 report	Schick[34] estimated that the enthalpy of transformation from ε -NbN to d -NbN at 1643 K was D7H 5 1.0 5 1.0 kcal/mole of NbN.

Sources

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

Weiming Huang, Thermodynamic assessment of the Nb-N system, Metall Mater Trans A 27, 3591-3600 (1996). doi:10.1007/bf02595450

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-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); 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); 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_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}
}