Rh–Zr phases

11 phases (tier A 5, tier C 4, liquid 1, needs_review 1); 11 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–Zr system page · Markdown · field reference

Phases of the Rh–Zr system (11)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:rh-zr:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1013.26–2322.86 K, x(Zr) 0.8888–1	1
FCC_A1 phase:rh-zr:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2240 K, x(Zr) 0–0.08191	1
HCP_A3 phase:rh-zr:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2118.26 K, x(Zr) 1–1	1
LIQUID phase:rh-zr:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1352.68–4000 K, x(Zr) 0–1	1
RH3ZR_L12 phase:rh-zr:rh3zr-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2192.99 K, x(Zr) 0.19803–0.25609	1
RH4ZR3_HT phase:rh-zr:rh4zr3-ht		needs_review	stable in 1 of 1 calculated diagram(s): 1772.54–1930 K, x(Zr) 0.43386–0.44322	1
RH4ZR3_LT phase:rh-zr:rh4zr3-lt	Pd4Pu3 · hR14 · R-3 (148)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1902.97 K, x(Zr) 0.42857–0.44815	1
RH5ZR3 phase:rh-zr:rh5zr3	Pd5Pu3 · oC32 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2026.12 K, x(Zr) 0.36675–0.375	1
RHZR_LT phase:rh-zr:rhzr	IrZr · oC16 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–943.01 K, x(Zr) 0.48845–0.5	1
RHZR_B2 phase:rh-zr:rhzr-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 580–2197.58 K, x(Zr) 0.40136–0.5	1
RHZR2 phase:rh-zr:rhzr2	NiTi2 · cF96 · Fd-3m (227)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1448.19 K, x(Zr) 0.66667–0.66667	1

BCC_A2 (Rh–Zr)

Id: phase:rh-zr: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): 1013.26–2322.86 K, x(Zr) 0.8888–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:bcc-a2
tdb: tdb:RhZr-04Du.tdb:BCC_A2

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

RhZr-04Du.tdb: BCC_A2, type code %B, sha256 406172764982f8ba…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : RH ZR% : VA : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

FCC_A1 (Rh–Zr)

Id: phase:rh-zr: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): 300–2240 K, x(Zr) 0–0.08191
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:fcc-a1
tdb: tdb:RhZr-04Du.tdb:FCC_A1

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

RhZr-04Du.tdb: FCC_A1, type code %A, sha256 406172764982f8ba…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : RH% ZR : VA : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

HCP_A3 (Rh–Zr)

Id: phase:rh-zr: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): 300–2118.26 K, x(Zr) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:hcp-a3
tdb: tdb:RhZr-04Du.tdb:HCP_A3

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

RhZr-04Du.tdb: HCP_A3, type code %A, sha256 406172764982f8ba…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : RH ZR% : VA : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

LIQUID (Rh–Zr)

Id: phase:rh-zr:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1352.68–4000 K, x(Zr) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:liquid
tdb: tdb:RhZr-04Du.tdb:LIQUID

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

RhZr-04Du.tdb: LIQUID, type code %, sha256 406172764982f8ba…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : RH ZR : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

RH3ZR_L12 (Rh–Zr)

Id: phase:rh-zr:rh3zr-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: partitioned order/disorder model in RhZr-04Du.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2192.99 K, x(Zr) 0.19803–0.25609
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:rh3zr-l12
tdb: tdb:RhZr-04Du.tdb:RH3ZR_L12

TDB models of RH3ZR_L12 (1): PHASE and CONSTITUENT statements as written

RhZr-04Du.tdb: RH3ZR_L12, type code %, sha256 406172764982f8ba…

47: PHASE RH3ZR_L12 % 2 3 1 !
48: CONST RH3ZR_L12 : RH% ZR : RH ZR% : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

RH4ZR3_HT (Rh–Zr)

Id: phase:rh-zr:rh4zr3-ht; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Rh4Zr3-ht) — Hallstedt 2025 mmc2 row for RH4ZR3_HT: Rh4Zr3 (high T)
Stability: stable in 1 of 1 calculated diagram(s): 1772.54–1930 K, x(Zr) 0.43386–0.44322
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:rh4zr3-ht
tdb: tdb:RhZr-04Du.tdb:RH4ZR3_HT

TDB models of RH4ZR3_HT (1): PHASE and CONSTITUENT statements as written

RhZr-04Du.tdb: RH4ZR3_HT, type code %, sha256 406172764982f8ba…

62: PHASE RH4ZR3_HT % 2 4 3 !
63: CONST RH4ZR3_HT : RH% ZR : ZR : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

RH4ZR3_LT (Rh–Zr)

Id: phase:rh-zr:rh4zr3-lt; status assigned
Structure: Pd4Pu3 · hR14 · R-3 (148); type st:pd4pu3-hr14; 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_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–1902.97 K, x(Zr) 0.42857–0.44815
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:rh4zr3-lt
tdb: tdb:RhZr-04Du.tdb:RH4ZR3_LT

TDB models of RH4ZR3_LT (1): PHASE and CONSTITUENT statements as written

RhZr-04Du.tdb: RH4ZR3_LT, type code %, sha256 406172764982f8ba…

57: PHASE RH4ZR3_LT % 2 4 3 !
58: CONST RH4ZR3_LT : RH% ZR : ZR : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

RH5ZR3 (Rh–Zr)

Id: phase:rh-zr:rh5zr3; status assigned
Structure: Pd5Pu3 · oC32 · Cmcm (63); type st:pd5pu3-oc32; 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_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–2026.12 K, x(Zr) 0.36675–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:rh5zr3
tdb: tdb:RhZr-04Du.tdb:RH5ZR3

TDB models of RH5ZR3 (1): PHASE and CONSTITUENT statements as written

RhZr-04Du.tdb: RH5ZR3, type code %, sha256 406172764982f8ba…

52: PHASE RH5ZR3 % 2 5 3 !
53: CONST RH5ZR3 : RH : RH ZR% : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

RHZR_LT (Rh–Zr)

Id: phase:rh-zr:rhzr; status assigned
Structure: IrZr · oC16 · Cmcm (63); type st:irzr-oc16; 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_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–943.01 K, x(Zr) 0.48845–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:rhzr
tdb: tdb:RhZr-04Du.tdb:RHZR_LT

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

RhZr-04Du.tdb: RHZR_LT, type code %, sha256 406172764982f8ba…

67: PHASE RHZR_LT % 2 1 1 !
68: CONST RHZR_LT : RH : RH ZR% : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

RHZR_B2 (Rh–Zr)

Id: phase:rh-zr:rhzr-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 580–2197.58 K, x(Zr) 0.40136–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:rhzr-b2
tdb: tdb:RhZr-04Du.tdb:RHZR_B2

TDB models of RHZR_B2 (1): PHASE and CONSTITUENT statements as written

RhZr-04Du.tdb: RHZR_B2, type code %, sha256 406172764982f8ba…

72: PHASE RHZR_B2 % 2 1 1 !
73: CONST RHZR_B2 : RH : RH ZR% : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
assessment that models this phase

RHZR2 (Rh–Zr)

Id: phase:rh-zr:rhzr2; status assigned
Structure: NiTi2 · cF96 · Fd-3m (227); type st:niti2-cf96; 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 (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Rh 0.3333, Zr 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1448.19 K, x(Zr) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:rh-zr:rhzr2
tdb: tdb:RhZr-04Du.tdb:RHZR2

TDB models of RHZR2 (1): PHASE and CONSTITUENT statements as written

RhZr-04Du.tdb: RHZR2, type code %, sha256 406172764982f8ba…

77: PHASE RHZR2 % 2 1 2 !
78: CONST RHZR2 : RH : ZR : !

Example references (1 of 1; assessments first):

doi:10.3139/ijmr-2004-0017 Z. Du, Z. Metallkd., 95, 70-75(2004).
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}
}