# B–Nb–Ti system > B–Nb–Ti system: 52 accepted literature values (formation 37, invariant reaction 15) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/B-NB-TI.html · Markdown: https://data.orchid-project.org/systems/B-NB-TI.md 52 accepted literature values from 1 paper(s) (experimental 5, model 18, DFT 29); 0 calculated phase diagram(s). Data: [JSON](https://data.orchid-project.org/literature/systems/B-NB-TI.json) · [CSV](https://data.orchid-project.org/systems/B-NB-TI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#B-NB-TI) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/B-NB-TI.html) · [Markdown](https://data.orchid-project.org/systems/B-NB-TI.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | experimental | 5 | | model | 18 | | DFT | 29 | Table: Accepted values by property group | Property group | Values | |---|---:| | invariant reaction | 15 | | formation | 37 | ## Invariant reactions (literature) Table: Invariant reactions reported in the literature for the B–Nb–Ti system (15) | T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote | |---:|---|---|---|---|---|---| | 3070 | quasi-peritectic: L + Nb5B6 -> Nb3B4 + NbB | L: B 0.502, Ti 0.108 | model | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 5, p. 10, row 2; `ORC-PKOTJ2JBHD` | | | 3068 | quasi-peritectic: L + Nb5B6 -> Nb3B4 + NbB | L: B 0.53 | experimental | [1] Nakama 2009; _cites Borisov 2007_ [doi](https://doi.org/10.1007/s11106-007-0011-y) | Table 5, p. 10, row 3; `ORC-JQDYAWA6RB` | | | 3068 | quasi-peritectic: L + Nb5B6 -> Nb3B4 + NbB | L: B 0.479, Ti 0.161 | model | [1] Nakama 2009 | Table 5, p. 10, row 1; `ORC-VPWGAFQ6V7` | | | 2978 | quasi-peritectic: L + Nb3B4 -> (Nb,Ti)B2 + NbB | L: B 0.468, Ti 0.242 | model | [1] Nakama 2009 | Table 5, p. 10, row 4; `ORC-XRSY4GCYEJ` | | | 2966 | quasi-peritectic: L + Nb3B4 -> (Nb,Ti)B2 + NbB | L: B 0.478, Ti 0.19 | model | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 5, p. 10, row 5; `ORC-QUYY4PIHBB` | | | 2965 | quasi-peritectic: L + Nb3B4 -> (Nb,Ti)B2 + NbB | L: B 0.53, Ti 0.11 | experimental | [1] Nakama 2009; _cites Borisov 2007_ [doi](https://doi.org/10.1007/s11106-007-0011-y) | Table 5, p. 10, row 6; `ORC-C3JCOVVRUG` | | | 2923 | peritectic: L + (Nb,Ti)B2 + NbB -> TiB | L: B 0.42, Ti 0.33 | experimental | [1] Nakama 2009; _cites Borisov 2007_ [doi](https://doi.org/10.1007/s11106-007-0011-y) | Table 5, p. 10, row 9; `ORC-R433GSI5VB` | | | 2920 | peritectic: L + (Nb,Ti)B2 + NbB -> TiB | L: B 0.453, Ti 0.281 | model | [1] Nakama 2009 | Table 5, p. 10, row 7; `ORC-3LERI3HTIN` | | | 2920 | peritectic: L + (Nb,Ti)B2 + NbB -> TiB | L: B 0.464, Ti 0.22 | model | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 5, p. 10, row 8; `ORC-CZHDMEEMDF` | | | 2683 | peritectic: L + (Nb,Ti)B2 + TiB -> Ti3B4 | L: B 0.41, Ti 0.52 | experimental | [1] Nakama 2009; _cites Borisov 2007_ [doi](https://doi.org/10.1007/s11106-007-0011-y) | Table 5, p. 10, row 12; `ORC-AYFNNGEGPU` | | | 2683 | peritectic: L + (Nb,Ti)B2 + TiB -> Ti3B4 | L: B 0.399, Ti 0.354 | model | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 5, p. 10, row 11; `ORC-UMO3QM2WDU` | | | 2464 | peritectic: L + (Nb,Ti)B2 + TiB -> Ti3B4 | L: B 0.375, Ti 0.621 | model | [1] Nakama 2009 | Table 5, p. 10, row 10; `ORC-CRREQTPWNW` | | | 2063 | quasi-peritectic: L + NbB -> TiB + α | L: B 0.13, Ti 0.39 | experimental | [1] Nakama 2009; _cites Borisov 2007_ [doi](https://doi.org/10.1007/s11106-007-0011-y) | Table 5, p. 10, row 15; `ORC-5A3OLORFSA` | | | 2063 | quasi-peritectic: L + NbB -> TiB + α | L: B 0.149, Ti 0.496 | model | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 5, p. 10, row 14; `ORC-6KVTQZQLLY` | | | 2061 | quasi-peritectic: L + NbB -> TiB + α | L: B 0.161, Ti 0.395 | model | [1] Nakama 2009 | Table 5, p. 10, row 13; `ORC-L32O5LRIBG` | | ## 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](https://data.orchid-project.org/literature/dft_parity.json). Table: Enthalpies of formation, B–Nb–Ti system (37) | Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote | |---|---|---:|---:|---|---:|---:|---|---|---| | (Nb,Ti)3B2 | | -74.5 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 2; `ORC-DSFCINVKPW.629e4b` | | | (Nb,Ti)3B2 | | -66.8 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 5; `ORC-RPPVIRWXU6.869c80` | | | (Nb,Ti)3B2 | | -66.7 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 6; `ORC-HJHUXQMHC7.0f15cf` | | | (Nb,Ti)3B2 | | -66.6 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 4; `ORC-X4U2HRLVOS.7b3b11` | | | (Nb,Ti)3B2 | | -65.8 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 3; `ORC-Z447W4XU6L.b78498` | | | (Nb,Ti)3B2 | | -65.7 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 7; `ORC-2O7E6OWO3G.173307` | | | (Nb,Ti)3B2 | | -64.5 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 8; `ORC-J7JBW4XPFN.6f247c` | | | (Nb,Ti)3B2 | | -64.4 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 1; `ORC-BUW6VD527B.86c0ef` | | | (Nb,Ti)3B2 | | -62.7 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 9; `ORC-PKPU7373DK.3ccb4a` | | | (Nb,Ti)3B2 | | -60 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 11; `ORC-5ANBFPTCVW.36d856` | | | (Nb,Ti)3B2 | | -57.8 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 10; `ORC-4GKHEYTU6M.7bc5cd` | | | (Nb,Ti)3B4 | | -94.3 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 47; `ORC-TGSD2WGOLE.06d04c` | | | (Nb,Ti)3B4 | | -92.5 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 45; `ORC-FTCOLQLJ6Y.58c314` | | | (Nb,Ti)3B4 | | -90.8 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 44; `ORC-BAY2GYCCEQ.1406bf` | | | (Nb,Ti)3B4 | | -90.6 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 43; `ORC-VU3KRAWCTA.2115e1` | | | (Nb,Ti)3B4 | | -88.7 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 42; `ORC-W7R4YXPN7L.76d3b8` | | | (Nb,Ti)3B4 | | -85.5 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 46; `ORC-CB73KT2VMU.7e2be5` | | | (Nb,Ti)3B4 | | -81.7 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 40; `ORC-S64SROE2AD.af91cf` | | | (Nb,Ti)3B4 | | -78.8 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 39; `ORC-VR4XPJ3LJ7.94874a` | | | (Nb,Ti)5B6 | | -89 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 37; `ORC-OYPYVLNJEO.735709` | | | (Nb,Ti)5B6 | | -88.8 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 36; `ORC-7C2P6ZZOKI.e94ecc` | | | (Nb,Ti)5B6 | | -88.2 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 35; `ORC-3H6V6Y6ESG.834ccd` | | | (Nb,Ti)5B6 | | -86.2 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 34; `ORC-TGKG2YD5RZ.17a857` | | | (Nb,Ti)5B6 | | -84.9 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 33; `ORC-RCM5YOLD2Q.2cc6c5` | | | (Nb,Ti)5B6 | | -82.2 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 32; `ORC-56GZ4HGJBB.b706bc` | | | (Nb,Ti)5B6 | | -80.6 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 31; `ORC-AOHCOLNXVA.272ce3` | | | (Nb,Ti)5B6 | | -78.7 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 30; `ORC-2UCL4XFUNV.0574f7` | | | (Nb,Ti)5B6 | | 2.3 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 38; `ORC-3VC3HNBMR2.274d6d` | | | (Nb,Ti)B2 | | -109.7 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 56; `ORC-IR3WZYOAHU.1be0a7` | | | (Nb,Ti)B2 | | -105.2 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 55; `ORC-UPWMQVL7YR.15c369` | | | (Nb,Ti)B2 | | -101.1 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 54; `ORC-SFUSAJQIG3.09150f` | | | (Nb,Ti)B2 | | -96.2 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 53; `ORC-N6ITU7TQAN.08f778` | | | (Nb,Ti)B2 | | -90.9 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 52; `ORC-7ECPEJTTFN.a903b1` | | | (Nb,Ti)B2 | | -85.3 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 51; `ORC-ZJW7WVVIH4.32cf7b` | | | (Nb,Ti)B2 | | -84.4 kJ/mol-atom | | model | | | [1] Nakama 2009; _cites Witusiewicz 2008_ [doi](https://doi.org/10.1016/j.jallcom.2007.02.030) | Table 4, p. 7, row 49; `ORC-54WGOYGEZO.768e9c` | | | (Nb,Ti)B2 | | -80.1 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 50; `ORC-G2PAE33JW5.8b42be` | | | (Nb,Ti)B2 | | -72.7 kJ/mol-atom | 0 | DFT | | | [1] Nakama 2009 | Table 4, p. 7, row 48; `ORC-E2ZCTUHWWH.0cbab3` | | ## Sources Reporting papers the values were read from (a value cited from another work names that work in its row). 1. Yu Nakama, Hiroshi Ohtani, Mitsuhiro Hasebe, Thermodynamic Analysis of the Nb–Ti–B Ternary Phase Diagram, Mater. Trans. 50, 984-993 (2009). [doi:10.2320/matertrans.mc200820](https://doi.org/10.2320/matertrans.mc200820) ## 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 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); 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. ```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_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/).