Pt–Ti phases

10 phases (tier A 7, tier B 1, liquid 1, needs_review 1); 10 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · Pt–Ti system page · Markdown · field reference

Phases of the Pt–Ti system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:pt-ti:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1112.87–1940.98 K, x(Ti) 0.91726–1	4	1
FCC_A1 phase:pt-ti:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2073.38 K, x(Ti) 0–0.11595	4	1
HCP_A3 phase:pt-ti:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1154.99 K, x(Ti) 0.97816–1	2	1
LIQUID phase:pt-ti:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1583.06–2500 K, x(Ti) 0–1	16	1
PT3TI_D024 phase:pt-ti:pt3ti-d024	Ni3Ti · D0_24 · hP16 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2223.38 K, x(Ti) 0.19929–0.25	10	1
PT3TI4 phase:pt-ti:pt3ti4		needs_review	stable in 1 of 1 calculated diagram(s): 300–1478.17 K, x(Ti) 0.57143–0.57143	3	1
PT8TI phase:pt-ti:pt8ti	Pt8Ti · tI18 · I4/mmm (139)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–1353.05 K, x(Ti) 0.11111–0.11111	2	1
PTTI_B19 phase:pt-ti:ptti-b19	AuCd · B19 · oP4 · Pmma (51)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1312.19 K, x(Ti) 0.47653–0.50121	6	1
PTTI_B2 phase:pt-ti:ptti-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1306.87–2106.45 K, x(Ti) 0.43883–0.51961	0	1
PTTI3_A15 phase:pt-ti:ptti3-a15	Cr3Si · A15 · cP8 · Pm-3n (223)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1772.47 K, x(Ti) 0.73275–0.78224	13	1

BCC_A2 (Pt–Ti)

Id: phase:pt-ti:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1112.87–1940.98 K, x(Ti) 0.91726–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pt-ti:bcc-a2
paper: paper:10.1016/j.jallcom.2007.07.047:Bcc
tdb: tdb:PtTi-08Li.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: BCC_A2, type code %B, sha256 225d207ff370fad5…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : PT TI : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase

FCC_A1 (Pt–Ti)

Id: phase:pt-ti:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2073.38 K, x(Ti) 0–0.11595
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pt-ti:fcc-a1
paper: paper:10.1016/j.jallcom.2007.07.047:Fcc
tdb: tdb:PtTi-08Li.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: FCC_A1, type code %A, sha256 225d207ff370fad5…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : PT TI : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02644471 P. J. Meschter, W. L. Worrell, An investigation of high-temperature thermodynamic properties in the Pt-Ti system, Metall Trans A 7, 299-305 (1976).
cited as the source of values for this phase

HCP_A3 (Pt–Ti)

Id: phase:pt-ti:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1154.99 K, x(Ti) 0.97816–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pt-ti:hcp-a3
paper: paper:10.1016/j.jallcom.2007.07.047:Hcp
tdb: tdb:PtTi-08Li.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: HCP_A3, type code %A, sha256 225d207ff370fad5…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : PT TI : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase

LIQUID (Pt–Ti)

Id: phase:pt-ti:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1583.06–2500 K, x(Ti) 0–1
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pt-ti:liquid
paper: paper:10.1016/j.jallcom.2007.07.047:L
tdb: tdb:PtTi-08Li.tdb:LIQUID

TDB models of LIQUID (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: LIQUID, type code %, sha256 225d207ff370fad5…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : PT TI : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2003.12.001 T Biggs, L.A Cornish, M.J Witcomb, M.B Cortie, Revised phase diagram for the Pt–Ti system from 30 to 60 at.% platinum, Journal of Alloys and Compounds 375, 120-127 (2004).
cited as the source of values for this phase

PT3TI_D024 (Pt–Ti)

Id: phase:pt-ti:pt3ti-d024; status assigned
Structure: Ni3Ti · D0_24 · hP16 · P6_3/mmc (194); type st:d0-24-ni3ti-hp16; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2223.38 K, x(Ti) 0.19929–0.25
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pt-ti:pt3ti-d024
paper: paper:10.1016/j.jallcom.2007.07.047:TiPt3-, paper:10.1016/j.jallcom.2007.07.047:γ
tdb: tdb:PtTi-08Li.tdb:PT3TI_D024

TDB models of PT3TI_D024 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: PT3TI_D024, type code %, sha256 225d207ff370fad5…

49: PHASE PT3TI_D024 % 2 3 1 !
50: CONST PT3TI_D024 : PT : PT TI% : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02644471 P. J. Meschter, W. L. Worrell, An investigation of high-temperature thermodynamic properties in the Pt-Ti system, Metall Trans A 7, 299-305 (1976).
cited as the source of values for this phase
doi:10.1007/bf02869304 J.L. Murray, Bull Alloy Phase Diagram 3 (1982) 329–335.
cited as the source of values for this phase

PT3TI4 (Pt–Ti)

Id: phase:pt-ti:pt3ti4; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Pt3Ti4) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Pt3Ti4) — Hallstedt 2025 mmc2 row for PT3TI4: Pt3Ti4
Stoichiometry: Pt 0.4286, Ti 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 300–1478.17 K, x(Ti) 0.57143–0.57143
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pt-ti:pt3ti4
paper: paper:10.1016/j.jallcom.2007.07.047:Ti4Pt3
tdb: tdb:PtTi-08Li.tdb:PT3TI4

TDB models of PT3TI4 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: PT3TI4, type code %, sha256 225d207ff370fad5…

64: PHASE PT3TI4 % 2 3 4 !
65: CONST PT3TI4 : PT : TI : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2003.12.001 T Biggs, L.A Cornish, M.J Witcomb, M.B Cortie, Revised phase diagram for the Pt–Ti system from 30 to 60 at.% platinum, Journal of Alloys and Compounds 375, 120-127 (2004).
cited as the source of values for this phase

PT8TI (Pt–Ti)

Id: phase:pt-ti:pt8ti; status assigned
Structure: Pt8Ti · tI18 · I4/mmm (139); type st:pt8ti-ti18; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Pt 0.8889, Ti 0.1111
Stability: stable in 1 of 1 calculated diagram(s): 300–1353.05 K, x(Ti) 0.11111–0.11111
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:pt-ti:pt8ti
mp: mp:mp-aaaabtqq
oqmd: oqmd:oqmd-18017
paper: paper:10.1016/j.jallcom.2007.07.047:TiPt8
tdb: tdb:PtTi-08Li.tdb:PT8TI

TDB models of PT8TI (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: PT8TI, type code %, sha256 225d207ff370fad5…

44: PHASE PT8TI % 2 8 1 !
45: CONST PT8TI : PT : TI : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02644471 P. J. Meschter, W. L. Worrell, An investigation of high-temperature thermodynamic properties in the Pt-Ti system, Metall Trans A 7, 299-305 (1976).
cited as the source of values for this phase

PTTI_B19 (Pt–Ti)

Id: phase:pt-ti:ptti-b19; status assigned
Structure: AuCd · B19 · oP4 · Pmma (51); type st:b19-aucd-op4; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in PtTi-08Li.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–1312.19 K, x(Ti) 0.47653–0.50121
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pt-ti:ptti-b19
paper: paper:10.1016/j.jallcom.2007.07.047:αTiPt
tdb: tdb:PtTi-08Li.tdb:PTTI_B19

TDB models of PTTI_B19 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: PTTI_B19, type code %, sha256 225d207ff370fad5…

54: PHASE PTTI_B19 % 2 1 1 !
55: CONST PTTI_B19 : PT% TI : PT TI% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02869304 J.L. Murray, Bull Alloy Phase Diagram 3 (1982) 329–335.
cited as the source of values for this phase

PTTI_B2 (Pt–Ti)

Id: phase:pt-ti:ptti-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in PtTi-08Li.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 1306.87–2106.45 K, x(Ti) 0.43883–0.51961
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pt-ti:ptti-b2
tdb: tdb:PtTi-08Li.tdb:PTTI_B2

TDB models of PTTI_B2 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: PTTI_B2, type code %, sha256 225d207ff370fad5…

59: PHASE PTTI_B2 % 2 1 1 !
60: CONST PTTI_B2 : PT% TI : PT TI% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase

PTTI3_A15 (Pt–Ti)

Id: phase:pt-ti:ptti3-a15; status assigned
Structure: Cr3Si · A15 · cP8 · Pm-3n (223); type st:a15-cr3si-cp8; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in PtTi-08Li.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–1772.47 K, x(Ti) 0.73275–0.78224
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pt-ti:ptti3-a15
paper: paper:10.1016/j.jallcom.2007.07.047:Ti3Pt
tdb: tdb:PtTi-08Li.tdb:PTTI3_A15

TDB models of PTTI3_A15 (1): PHASE and CONSTITUENT statements as written

PtTi-08Li.tdb: PTTI3_A15, type code %, sha256 225d207ff370fad5…

69: PHASE PTTI3_A15 % 2 1 3 !
70: CONST PTTI3_A15 : PT% TI : PT TI% : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2007.07.047 Mei Li, Wei Han, Changrong Li, Thermodynamic assessment of the Pt–Ti system, Journal of Alloys and Compounds 461, 189-194 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/j.jallcom.2003.12.001 T Biggs, L.A Cornish, M.J Witcomb, M.B Cortie, Revised phase diagram for the Pt–Ti system from 30 to 60 at.% platinum, Journal of Alloys and Compounds 375, 120-127 (2004).
cited as the source of values for this phase
doi:10.1007/bf02869304 J.L. Murray, Bull Alloy Phase Diagram 3 (1982) 329–335.
cited as the source of values for this phase

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735970
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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). 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_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  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}
}