Pd–Ti phases

10 phases (tier A 8, tier C 1, liquid 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 · Pd–Ti system page · Markdown · field reference

Phases of the Pd–Ti system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:pd-ti:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 868.41–1890 K, x(Ti) 0.52–1	6	2
B2_BCC phase:pd-ti:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 783–2499.73 K, x(Ti) 0.44392–1	11	1
FCC_A1 phase:pd-ti:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1829.99 K, x(Ti) 0–0.21354	4	1
HCP_A3 phase:pd-ti:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1163.41 K, x(Ti) 0.97157–1	2	1
LIQUID phase:pd-ti:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1395.98–2500 K, x(Ti) 0–1	17	1
PD3TI_D024 phase:pd-ti:pd3ti-d024	Ni3Ti · D0_24 · hP16 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1802.54 K, x(Ti) 0.25–0.25	6	1
PD3TI2 phase:pd-ti:pd3ti2	Pd3Ti2 · oC20 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1602.73 K, x(Ti) 0.4–0.4	6	1
PDTI_B19 phase:pd-ti:pdti-b19	AuCd · B19 · oP4 · Pmma (51)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–813.01 K, x(Ti) 0.48749–0.51282	5	1
PDTI_C11B phase:pd-ti:pdti-c11b	MoSi2 · C11_b · tI6 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1684.79 K, x(Ti) 0.33603–0.66667	11	1
PDTI3_A15 phase:pd-ti:pdti3-a15	Cr3Si · A15 · cP8 · Pm-3n (223)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–963.06 K, x(Ti) 0.75–0.75	4	1

BCC_A2 (Pd–Ti)

Id: phase:pd-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): 868.41–1890 K, x(Ti) 0.52–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pd-ti:bcc-a2
paper: paper:10.1016/j.calphad.2011.07.004:bcc
tdb: tdb:PdTi-11Guo.tdb:A2_BCC, tdb:PdTi-11Guo.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

PdTi-11Guo.tdb: A2_BCC, type code %B, sha256 e8810155ee2f9664…

37: PHASE A2_BCC %B 2 1 3 !
38: CONST A2_BCC : PD TI% : VA : !

PdTi-11Guo.tdb: BCC_A2, type code %B, sha256 e8810155ee2f9664…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : PD TI% : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

B2_BCC (Pd–Ti)

Id: phase:pd-ti:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: PdTi-11Guo.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: partitioned order/disorder model in PdTi-11Guo.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 783–2499.73 K, x(Ti) 0.44392–1
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pd-ti:bcc-b2, corpus:phase:pd-ti:b2-bcc
paper: paper:10.1016/j.calphad.2011.07.004:βPdTi
tdb: tdb:PdTi-11Guo.tdb:B2_BCC

TDB models of B2_BCC (1): PHASE and CONSTITUENT statements as written

PdTi-11Guo.tdb: B2_BCC, type code %BO, sha256 e8810155ee2f9664…

42: PHASE B2_BCC %BO 3 0.5 0.5 3 !
43: CONST B2_BCC : PD% TI : PD TI% : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

FCC_A1 (Pd–Ti)

Id: phase:pd-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): 300–1829.99 K, x(Ti) 0–0.21354
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-ti:fcc-a1
paper: paper:10.1016/j.calphad.2011.07.004:fcc
tdb: tdb:PdTi-11Guo.tdb:FCC_A1

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

PdTi-11Guo.tdb: FCC_A1, type code %A, sha256 e8810155ee2f9664…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : PD% TI : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

HCP_A3 (Pd–Ti)

Id: phase:pd-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): 300–1163.41 K, x(Ti) 0.97157–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-ti:hcp-a3
paper: paper:10.1016/j.calphad.2011.07.004:hcp
tdb: tdb:PdTi-11Guo.tdb:HCP_A3

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

PdTi-11Guo.tdb: HCP_A3, type code %A, sha256 e8810155ee2f9664…

47: PHASE HCP_A3 %A 2 1 0.5 !
48: CONST HCP_A3 : PD TI% : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

LIQUID (Pd–Ti)

Id: phase:pd-ti:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1395.98–2500 K, x(Ti) 0–1
Literature: 17 values (17 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-ti:liquid
paper: paper:10.1016/j.calphad.2011.07.004:L
tdb: tdb:PdTi-11Guo.tdb:LIQUID

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

PdTi-11Guo.tdb: LIQUID, type code %, sha256 e8810155ee2f9664…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : PD TI : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

PD3TI_D024 (Pd–Ti)

Id: phase:pd-ti:pd3ti-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
Caveat: DFT agrees: on-hull mp-aaackxzb and oqmd-21293, space group 194
Stoichiometry: Pd 0.7500, Ti 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1802.54 K, x(Ti) 0.25–0.25
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:pd-ti:pd3ti-d024
mp: mp:mp-aaackxzb
oqmd: oqmd:oqmd-21293
paper: paper:10.1016/j.calphad.2011.07.004:Pd3Ti
tdb: tdb:PdTi-11Guo.tdb:PD3TI_D024

TDB models of PD3TI_D024 (1): PHASE and CONSTITUENT statements as written

PdTi-11Guo.tdb: PD3TI_D024, type code %, sha256 e8810155ee2f9664…

52: PHASE PD3TI_D024 % 2 3 1 !
53: CONST PD3TI_D024 : PD : TI : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

PD3TI2 (Pd–Ti)

Id: phase:pd-ti:pd3ti2; status assigned
Structure: Pd3Ti2 · oC20 · Cmcm (63); type st:pd3ti2-oc20; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Pd 0.6000, Ti 0.4000
Stability: stable in 1 of 1 calculated diagram(s): 300–1602.73 K, x(Ti) 0.4–0.4
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-ti:pd3ti2
paper: paper:10.1016/j.calphad.2011.07.004:Pd3Ti2
tdb: tdb:PdTi-11Guo.tdb:PD3TI2

TDB models of PD3TI2 (1): PHASE and CONSTITUENT statements as written

PdTi-11Guo.tdb: PD3TI2, type code %, sha256 e8810155ee2f9664…

62: PHASE PD3TI2 % 2 3 2 !
63: CONST PD3TI2 : PD : TI : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

PDTI_B19 (Pd–Ti)

Id: phase:pd-ti:pdti-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 PdTi-11Guo.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–813.01 K, x(Ti) 0.48749–0.51282
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-ti:pdti-b19
paper: paper:10.1016/j.calphad.2011.07.004:αPdTi
tdb: tdb:PdTi-11Guo.tdb:PDTI_B19

TDB models of PDTI_B19 (1): PHASE and CONSTITUENT statements as written

PdTi-11Guo.tdb: PDTI_B19, type code %, sha256 e8810155ee2f9664…

67: PHASE PDTI_B19 % 2 1 1 !
68: CONST PDTI_B19 : PD% TI : PD TI% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase

PDTI_C11B (Pd–Ti)

Id: phase:pd-ti:pdti-c11b; status assigned
Structure: MoSi2 · C11_b · tI6 · I4/mmm (139); type st:c11-b-mosi2-ti6; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in PdTi-11Guo.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–1684.79 K, x(Ti) 0.33603–0.66667
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pd-ti:pdti-c11b
paper: paper:10.1016/j.calphad.2011.07.004:Pd2Ti, paper:10.1016/j.calphad.2011.07.004:PdTi2
tdb: tdb:PdTi-11Guo.tdb:PDTI_C11B

TDB models of PDTI_C11B (1): PHASE and CONSTITUENT statements as written

PdTi-11Guo.tdb: PDTI_C11B, type code %, sha256 e8810155ee2f9664…

57: PHASE PDTI_C11B % 2 2 1 !
58: CONST PDTI_C11B : PD TI : PD TI : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
cited as the source of values for this phase

PDTI3_A15 (Pd–Ti)

Id: phase:pd-ti:pdti3-a15; status assigned
Structure: Cr3Si · A15 · cP8 · Pm-3n (223); type st:a15-cr3si-cp8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacjliq and oqmd-21288, space group 223
Stoichiometry: Pd 0.2500, Ti 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–963.06 K, x(Ti) 0.75–0.75
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:pd-ti:pdti3-a15
mp: mp:mp-aaacjliq
oqmd: oqmd:oqmd-21288
paper: paper:10.1016/j.calphad.2011.07.004:PdTi3
tdb: tdb:PdTi-11Guo.tdb:PDTI3_A15

TDB models of PDTI3_A15 (1): PHASE and CONSTITUENT statements as written

PdTi-11Guo.tdb: PDTI3_A15, type code %, sha256 e8810155ee2f9664…

72: PHASE PDTI3_A15 % 2 1 3 !
73: CONST PDTI3_A15 : PD : TI : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2011.07.004 Cuiping Guo, Mei Li, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Pd–Ti system, Calphad 35, 512-517 (2011).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02652177 H. Okamoto, Pd-Ti (palladium-titanium), JPE 14, 128-129 (1993).
cited as the source of values for this phase
doi:10.1016/j.msea.2006.01.120 T. Yamamuro, Y. Morizono, J. Honjyo, M. Nishida, Phase equilibrium and martensitic transformation in near equiatomic Ti Pd alloys, Materials Science and Engineering: A 438-440, 327-331 (2006).
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}
}