O–Ti system

35 accepted literature values from 1 paper(s) (experimental 13, model 22); 0 calculated phase diagram(s). 9 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (22) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	13
model	22

Accepted values by property group
Property group	Values
invariant reaction	35

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the O–Ti system (35)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
2168.3	congruent melting: hcp = liquid	hcp: O 0.299; liquid: O 0.299	model	[1] Cancarevic 2007	Table 4, p. 10, row 4 report
2158	congruent melting: hcp = liquid	hcp: O 0.24; liquid: O 0.24	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 3 report
2143	congruent melting: TiO2 = liquid	TiO2: O 0.6667; liquid: O 0.6667	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 16 report
2142.3	congruent melting: TiO2 = liquid	TiO2: O 0.6662; liquid: O 0.6662	model	[1] Cancarevic 2007	Table 4, p. 10, row 17 report
2138.6	liquid = TiO2-x + gas	L: Ti 0.3316; TiO2-x: Ti 0.3337; gas: Ti 1.000e-4	model	[1] Cancarevic 2007	Table 5, p. 11, row 8 report
2115	congruent melting: liquid = Ti2O3	liquid: O 0.6; Ti2O3: O 0.6	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 9 report
2112.3	congruent melting: liquid = Ti2O3	liquid: O 0.6; Ti2O3: O 0.6	model	[1] Cancarevic 2007	Table 4, p. 10, row 10 report
2047.7	congruent melting: Ti3O5 = liquid	Ti3O5: O 0.625; liquid: O 0.625	model	[1] Cancarevic 2007	Table 4, p. 10, row 13 report
2043.7	liquid + hcp = TiOx	liquid: O 0.4487; hcp: O 0.3307; TiOx: O 0.3979	model	[1] Cancarevic 2007	Table 4, p. 10, row 6 report
2043	liquid + hcp = TiOx	liquid: O 0.55; hcp: O 0.314; TiOx: O 0.345	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 5 report
2043	liquid = Ti2O3 + Ti3O5	liquid: O 0.63; Ti2O3: O 0.602; Ti3O5: O 0.6225	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 11 report
2039.7	liquid = Ti2O3 + Ti3O5	liquid: O 0.6198; Ti2O3: O 0.6; Ti3O5: O 0.6225	model	[1] Cancarevic 2007	Table 4, p. 10, row 12 report
2030.4	liquid + TiO2-x = Ti20O39	L: Ti 0.3457; TiO2-x: Ti 0.3356; Ti20O39: Ti 0.339	model	[1] Cancarevic 2007	Table 5, p. 11, row 7 report
2016.42	liquid + hcp = bcc	liquid: O 0.0605; hcp: O 0.1434; bcc: O 0.0798	model	[1] Cancarevic 2007	Table 4, p. 10, row 2 report
1993	liquid + hcp = bcc	liquid: O 0.05; hcp: O 0.13; bcc: O 0.08	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 1 report
1993	liquid = TiOx + Ti2O3	liquid: O 0.57; TiOx: O 0.545; Ti2O3: O 0.598	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 7 report
1992.1	liquid = TiOx + Ti2O3	liquid: O 0.5587; TiOx: O 0.553; Ti2O3: O 0.6	model	[1] Cancarevic 2007	Table 4, p. 10, row 8 report
1971.3	liquid + Ti20O39 = Ti10O19	L: Ti 0.3524; Ti20O39: Ti 0.339; Ti10O19: Ti 0.3448	model	[1] Cancarevic 2007	Table 5, p. 11, row 6 report
1965.6	liquid + Ti10O19 = Ti9O17	L: Ti 0.3533; Ti10O19: Ti 0.3448; Ti9O17: Ti 0.3461	model	[1] Cancarevic 2007	Table 5, p. 11, row 5 report
1962.4	liquid + Ti9O17 = Ti8O15	L: Ti 0.3539; Ti9O17: Ti 0.3461; Ti8O15: Ti 0.3478	model	[1] Cancarevic 2007	Table 5, p. 11, row 4 report
1957.6	liquid + Ti8O15 = Ti7O13	L: Ti 0.3549; Ti8O15: Ti 0.3478; Ti7O13: Ti 0.35	model	[1] Cancarevic 2007	Table 5, p. 11, row 3 report
1954.7	liquid + Ti7O13 = Ti6O11	L: Ti 0.3557; Ti7O13: Ti 0.35; Ti6O11: Ti 0.3529	model	[1] Cancarevic 2007	Table 5, p. 11, row 2 report
1950.5	liquid + Ti6O11 = Ti5O9	L: Ti 0.3573; Ti6O11: Ti 0.3529; Ti5O9: Ti 0.3571	model	[1] Cancarevic 2007	Table 5, p. 11, row 1 report
1947.7	liquid = Ti3O5 + Ti5O9	liquid: O 0.6401; Ti3O5: O 0.625; Ti5O9: O 0.6429	model	[1] Cancarevic 2007	Table 4, p. 10, row 15 report
1943	liquid = Ti3O5 + Ti5O9	liquid: O 0.64; Ti3O5: O 0.625	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 14 report
1940.4	Ti3O5 + Ti5O9 = Ti4O7	Ti3O5: O 0.625; Ti5O9: O 0.6429; Ti4O7: O 0.6364	model	[1] Cancarevic 2007	Table 4, p. 10, row 25 report
1940	Ti3O5 + Ti5O9 = Ti4O7	Ti3O5: O 0.625; Ti5O9: O 0.6429; Ti4O7: O 0.6364	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 24 report
1213	hcp + TiOx = α-TiO	hcp: O 0.333; TiOx: O 0.51; α-TiO: O 0.5	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 18 report
1208.6	hcp + TiOx = α-TiO	hcp: O 0.3333; TiOx: O 0.5028; α-TiO: O 0.5	model	[1] Cancarevic 2007	Table 4, p. 10, row 19 report
1193	hcp + α-TiO = Ti3O2	hcp: O 0.324; α-TiO: O 0.5; Ti3O2: O 0.4	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 20 report
1193	hcp + α-TiO = Ti3O2	hcp: O 0.3333; α-TiO: O 0.5; Ti3O2: O 0.4	model	[1] Cancarevic 2007	Table 4, p. 10, row 21 report
1000	Ti3O5 = Ti2O3 + Ti4O7	Ti3O5: O 0.625; Ti2O3: O 0.6; Ti4O7: O 0.6364	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 26 report
778.4	Ti3O5 = Ti2O3 + Ti4O7	Ti3O5: O 0.625; Ti2O3: O 0.6; Ti4O7: O 0.6364	model	[1] Cancarevic 2007	Table 4, p. 10, row 27 report
733.5	TiOx = α-TiO + Ti2O3	TiOx: O 0.5411; α-TiO: O 0.5; Ti2O3: O 0.6	model	[1] Cancarevic 2007	Table 4, p. 10, row 23 report
733	TiOx = α-TiO + Ti2O3	TiOx: O 0.545; α-TiO: O 0.5; Ti2O3: O 0.6	experimental	[1] Cancarevic 2007 cites Murray 1987 doi	Table 4, p. 10, row 22 report

Sources

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

M. Cancarevic, M. Zinkevich, F. Aldinger, Thermodynamic description of the Ti–O system using the associate model for the liquid phase, Calphad 31, 330-342 (2007). doi:10.1016/j.calphad.2007.01.009

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}
}