# N–Nb system > N–Nb system: 8 accepted literature values (heat capacity / entropy / enthalpy 4, phase transition 3, other property 1) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/N-NB.html · Markdown: https://data.orchid-project.org/systems/N-NB.md 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](https://data.orchid-project.org/literature/systems/N-NB.json) · [CSV](https://data.orchid-project.org/systems/N-NB.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#N-NB) · [phases (5)](https://data.orchid-project.org/phases/pages/N-NB.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/N-NB.html) · [Markdown](https://data.orchid-project.org/systems/N-NB.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | experimental | 4 | | model | 4 | Table: 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](https://data.orchid-project.org/hulls/dft-mp/N/N-NB.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/N/N-NB.json) · [CALPHAD hull NbN-09Hal](https://data.orchid-project.org/hulls/calphad-sgte/N/N-NB--NbN-09Hal.json) · [CALPHAD hull NbN-96Hua-LB](https://data.orchid-project.org/hulls/calphad-sgte/N/N-NB--NbN-96Hua-LB.json) ## Other properties ### Phase transition (3) Table: 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](https://doi.org/10.1002/zaac.19251430121) | p. 1; `ORC-BOHRONVC6O` | “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; `ORC-BC7KMSSFBX` | “(The melting point of Nb is now accepted to be 2742 K.)” | | Phase transition | 2743 K | 2743 | liquid | experimental | [1] Huang 1996 | p. 5; `ORC-2ABAAXW234` | “The temperature of the sample was taken as the melting point of niobium, 2743 K.” | ### Heat capacity / entropy / enthalpy (4) Table: Heat capacity / entropy / enthalpy, N–Nb system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Entropy; _printed: 7S298_ | 37.7 unspecified ± 2 | 298.15 | | experimental | [1] Huang 1996 | p. 4; `ORC-HOSJCOR2SU.14e9e6` | “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; `ORC-HOSJCOR2SU.2d2fbd` | “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; `ORC-HOSJCOR2SU.82a6d5` | “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; `ORC-HOSJCOR2SU.e8020b` | “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) Table: 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; `ORC-IE4SSUD63U` | “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). 1. Weiming Huang, Thermodynamic assessment of the Nb-N system, Metall Mater Trans A 27, 3591-3600 (1996). [doi:10.1007/bf02595450](https://doi.org/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). https://doi.org/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). https://doi.org/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). https://doi.org/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. ```bibtex @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} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).