Rh–Ti phases

8 phases (tier A 5, tier B 1, tier C 1, liquid 1); 7 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 · Rh–Ti system page · Markdown · field reference

Phases of the Rh–Ti system (8)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:rh-ti:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 535.24–1840 K, x(Ti) 0.75–1	2
B2_BCC phase:rh-ti:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2221.79 K, x(Ti) 0.37495–1	1
FCC_A1 phase:rh-ti:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	2
L12_FCC phase:rh-ti:fcc-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2237 K, x(Ti) 0–0.28094	1
HCP_A3 phase:rh-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) 0.99758–1	1
LIQUID phase:rh-ti:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1555.98–4000 K, x(Ti) 0–1	1
RH5TI3 phase:rh-ti:rh5ti3	Ge3Rh5 · oP16 · Pbam (55)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–2115.61 K, x(Ti) 0.375–0.375	1
RHTI2 phase:rh-ti:rhti2	CuZr2 · tI6 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1085 K, x(Ti) 0.66667–0.66667	1

BCC_A2 (Rh–Ti)

Id: phase:rh-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): 535.24–1840 K, x(Ti) 0.75–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:rh-ti:bcc-a2
tdb: tdb:RhTi-22Hu.tdb:A2_BCC, tdb:RhTi-22Hu.tdb:BCC_A2

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

RhTi-22Hu.tdb: A2_BCC, type code %B, sha256 9a0f1ecc0389a4aa…

49: PHASE A2_BCC %B 2 1 3 !
50: CONST A2_BCC : RH TI% : VA : !

RhTi-22Hu.tdb: BCC_A2, type code %B, sha256 9a0f1ecc0389a4aa…

44: PHASE BCC_A2 %B 2 1 3 !
45: CONST BCC_A2 : RH TI% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models this phase

B2_BCC (Rh–Ti)

Id: phase:rh-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: RhTi-22Hu.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: partitioned order/disorder model in RhTi-22Hu.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2221.79 K, x(Ti) 0.37495–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-ti:bcc-b2
tdb: tdb:RhTi-22Hu.tdb:B2_BCC

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

RhTi-22Hu.tdb: B2_BCC, type code %BO, sha256 9a0f1ecc0389a4aa…

54: PHASE B2_BCC %BO 3 0.5 0.5 3 !
55: CONST B2_BCC : RH% TI : RH TI% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models this phase

FCC_A1 (Rh–Ti)

Id: phase:rh-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: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:rh-ti:fcc-a1
tdb: tdb:RhTi-22Hu.tdb:A1_FCC, tdb:RhTi-22Hu.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

RhTi-22Hu.tdb: A1_FCC, type code %A, sha256 9a0f1ecc0389a4aa…

34: PHASE A1_FCC %A 2 1 1 !
35: CONST A1_FCC : RH% TI : VA : !

RhTi-22Hu.tdb: FCC_A1, type code %A, sha256 9a0f1ecc0389a4aa…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models this phase

L12_FCC (Rh–Ti)

Id: phase:rh-ti:fcc-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: RhTi-22Hu.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
Caveat: partitioned order/disorder model in RhTi-22Hu.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2237 K, x(Ti) 0–0.28094
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-ti:fcc-l12
tdb: tdb:RhTi-22Hu.tdb:L12_FCC

TDB models of L12_FCC (1): PHASE and CONSTITUENT statements as written

RhTi-22Hu.tdb: L12_FCC, type code %AY, sha256 9a0f1ecc0389a4aa…

39: PHASE L12_FCC %AY 3 0.75 0.25 1 !
40: CONST L12_FCC : RH% TI : RH TI% : VA :  !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models this phase

HCP_A3 (Rh–Ti)

Id: phase:rh-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) 0.99758–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-ti:hcp-a3
tdb: tdb:RhTi-22Hu.tdb:HCP_A3

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

RhTi-22Hu.tdb: HCP_A3, type code %A, sha256 9a0f1ecc0389a4aa…

59: PHASE HCP_A3 %A 2 1 0.5 !
60: CONST HCP_A3 : RH TI% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models this phase

LIQUID (Rh–Ti)

Id: phase:rh-ti:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1555.98–4000 K, x(Ti) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-ti:liquid
tdb: tdb:RhTi-22Hu.tdb:LIQUID

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

RhTi-22Hu.tdb: LIQUID, type code %, sha256 9a0f1ecc0389a4aa…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models this phase

RH5TI3 (Rh–Ti)

Id: phase:rh-ti:rh5ti3; status assigned
Structure: Ge3Rh5 · oP16 · Pbam (55); type st:ge3rh5-op16; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Rh 0.6250, Ti 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–2115.61 K, x(Ti) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:rh-ti:rh5ti3
mp: mp:mp-aaaaaztt
oqmd: oqmd:oqmd-18075
tdb: tdb:RhTi-22Hu.tdb:RH5TI3

TDB models of RH5TI3 (1): PHASE and CONSTITUENT statements as written

RhTi-22Hu.tdb: RH5TI3, type code %, sha256 9a0f1ecc0389a4aa…

64: PHASE RH5TI3 % 2 5 3 !
65: CONST RH5TI3 : RH : TI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models this phase

RHTI2 (Rh–Ti)

Id: phase:rh-ti:rhti2; status assigned
Structure: CuZr2 · tI6 · I4/mmm (139); type st:cuzr2-ti6; 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 (dft_space_group_139_matches_5_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Rh 0.3333, Ti 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1085 K, x(Ti) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-ti:rhti2
tdb: tdb:RhTi-22Hu.tdb:RHTI2

TDB models of RHTI2 (1): PHASE and CONSTITUENT statements as written

RhTi-22Hu.tdb: RHTI2, type code %, sha256 9a0f1ecc0389a4aa…

69: PHASE RHTI2 % 2 1 2 !
70: CONST RHTI2 : RH : TI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2021.102386 X. Hu, L. Chen, C. Zhan, K. Xu, M. Lou, K. Chang, Calphad, 76, 102386(2022).
assessment that models 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}
}