Ce–Rh phases

11 phases (tier A 7, tier C 3, 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 · Ce–Rh system page · Markdown · field reference

Phases of the Ce–Rh system (11)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:ce-rh:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1000–1076.25 K, x(Rh) 0–0	1
CE3RH2 phase:ce-rh:ce3rh2	Er3Ni2 · hR15 · R-3 (148)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1082.66 K, x(Rh) 0.4–0.4	1
CE5RH3 phase:ce-rh:ce5rh3	Pu5Rh3 · tP32 · P4/ncc (130)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–993.98 K, x(Rh) 0.375–0.375	1
CE5RH4 phase:ce-rh:ce5rh4	Ge4Sm5 · oP36 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1229.18 K, x(Rh) 0.44444–0.44444	1
CE7RH3_D102 phase:ce-rh:ce7rh3-d102	Fe3Th7 · D10_2 · hP20 · P6_3mc (186)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1024.48 K, x(Rh) 0.3–0.3	1
CERH_B33 phase:ce-rh:cerh-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1330 K, x(Rh) 0.5–0.5	1
CERH2_C15 phase:ce-rh:cerh2-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1714.27 K, x(Rh) 0.66667–0.66667	1
CERH3_L12 phase:ce-rh:cerh3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1822.08 K, x(Rh) 0.75–0.75	1
FCC_A1 phase:ce-rh:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2238 K, x(Rh) 0–1	1
HCP_A3 phase:ce-rh:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
LIQUID phase:ce-rh:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 892.47–4000 K, x(Rh) 0–1	1

BCC_A2 (Ce–Rh)

Id: phase:ce-rh: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): 1000–1076.25 K, x(Rh) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:bcc-a2
tdb: tdb:CeRh-24Bou.tdb:BCC_A2

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

CeRh-24Bou.tdb: BCC_A2, type code %B, sha256 4df20ec37e9a2992…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : CE% RH : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

CE3RH2 (Ce–Rh)

Id: phase:ce-rh:ce3rh2; status assigned
Structure: Er3Ni2 · hR15 · R-3 (148); type st:er3ni2-hr15; 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_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ce 0.6000, Rh 0.4000
Stability: stable in 1 of 1 calculated diagram(s): 300–1082.66 K, x(Rh) 0.4–0.4
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:ce3rh2
tdb: tdb:CeRh-24Bou.tdb:CE3RH2

TDB models of CE3RH2 (1): PHASE and CONSTITUENT statements as written

CeRh-24Bou.tdb: CE3RH2, type code %, sha256 4df20ec37e9a2992…

58: PHASE CE3RH2 % 2 3 2 !
59: CONST CE3RH2 : CE : RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

CE5RH3 (Ce–Rh)

Id: phase:ce-rh:ce5rh3; status assigned
Structure: Pu5Rh3 · tP32 · P4/ncc (130); type st:pu5rh3-tp32; 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_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ce 0.6250, Rh 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–993.98 K, x(Rh) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:ce5rh3
tdb: tdb:CeRh-24Bou.tdb:CE5RH3

TDB models of CE5RH3 (1): PHASE and CONSTITUENT statements as written

CeRh-24Bou.tdb: CE5RH3, type code %, sha256 4df20ec37e9a2992…

53: PHASE CE5RH3 % 2 5 3 !
54: CONST CE5RH3 : CE : RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

CE5RH4 (Ce–Rh)

Id: phase:ce-rh:ce5rh4; status assigned
Structure: Ge4Sm5 · oP36 · Pnma (62); type st:ge4sm5-op36; 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_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ce 0.5556, Rh 0.4444
Stability: stable in 1 of 1 calculated diagram(s): 300–1229.18 K, x(Rh) 0.44444–0.44444
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:ce5rh4
tdb: tdb:CeRh-24Bou.tdb:CE5RH4

TDB models of CE5RH4 (1): PHASE and CONSTITUENT statements as written

CeRh-24Bou.tdb: CE5RH4, type code %, sha256 4df20ec37e9a2992…

63: PHASE CE5RH4 % 2 5 4 !
64: CONST CE5RH4 : CE : RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

CE7RH3_D102 (Ce–Rh)

Id: phase:ce-rh:ce7rh3-d102; status assigned
Structure: Fe3Th7 · D10_2 · hP20 · P6_3mc (186); type st:d10-2-fe3th7-hp20; tier A: standard phase name; confidence high
Stoichiometry: Ce 0.7000, Rh 0.3000
Stability: stable in 1 of 1 calculated diagram(s): 300–1024.48 K, x(Rh) 0.3–0.3
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:ce7rh3-d102
tdb: tdb:CeRh-24Bou.tdb:CE7RH3_D102

TDB models of CE7RH3_D102 (1): PHASE and CONSTITUENT statements as written

CeRh-24Bou.tdb: CE7RH3_D102, type code %, sha256 4df20ec37e9a2992…

48: PHASE CE7RH3_D102 % 2 7 3 !
49: CONST CE7RH3_D102 : CE : RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

CERH_B33 (Ce–Rh)

Id: phase:ce-rh:cerh-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacfycj and oqmd-29165, space group 63
Stoichiometry: Ce 0.5000, Rh 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1330 K, x(Rh) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ce-rh:cerh-b33
mp: mp:mp-aaacfycj
oqmd: oqmd:oqmd-29165
tdb: tdb:CeRh-24Bou.tdb:CERH_B33

TDB models of CERH_B33 (1): PHASE and CONSTITUENT statements as written

CeRh-24Bou.tdb: CERH_B33, type code %, sha256 4df20ec37e9a2992…

68: PHASE CERH_B33 % 2 1 1 !
69: CONST CERH_B33 : CE : RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

CERH2_C15 (Ce–Rh)

Id: phase:ce-rh:cerh2-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaabkp and oqmd-18272, space group 227
Stoichiometry: Ce 0.3333, Rh 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1714.27 K, x(Rh) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ce-rh:cerh2-c15
mp: mp:mp-aaaaabkp
oqmd: oqmd:oqmd-18272
tdb: tdb:CeRh-24Bou.tdb:CERH2_C15

TDB models of CERH2_C15 (1): PHASE and CONSTITUENT statements as written

CeRh-24Bou.tdb: CERH2_C15, type code %, sha256 4df20ec37e9a2992…

73: PHASE CERH2_C15 % 2 1 2 !
74: CONST CERH2_C15 : CE : RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

CERH3_L12 (Ce–Rh)

Id: phase:ce-rh:cerh3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Stoichiometry: Ce 0.2500, Rh 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1822.08 K, x(Rh) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:cerh3-l12
tdb: tdb:CeRh-24Bou.tdb:CERH3_L12

TDB models of CERH3_L12 (1): PHASE and CONSTITUENT statements as written

CeRh-24Bou.tdb: CERH3_L12, type code %, sha256 4df20ec37e9a2992…

78: PHASE CERH3_L12 % 2 1 3 !
79: CONST CERH3_L12 : CE : RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

FCC_A1 (Ce–Rh)

Id: phase:ce-rh: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): 300–2238 K, x(Rh) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:fcc-a1
tdb: tdb:CeRh-24Bou.tdb:FCC_A1

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

CeRh-24Bou.tdb: FCC_A1, type code %A, sha256 4df20ec37e9a2992…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : CE% RH% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

HCP_A3 (Ce–Rh)

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

Names (2): corpus: corpus:phase:ce-rh:hcp-a3
tdb: tdb:CeRh-24Bou.tdb:HCP_A3

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

CeRh-24Bou.tdb: HCP_A3, type code %A, sha256 4df20ec37e9a2992…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : CE RH : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
assessment that models this phase

LIQUID (Ce–Rh)

Id: phase:ce-rh:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 892.47–4000 K, x(Rh) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ce-rh:liquid
tdb: tdb:CeRh-24Bou.tdb:LIQUID

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

CeRh-24Bou.tdb: LIQUID, type code %, sha256 4df20ec37e9a2992…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : CE CERH RH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2024.102747 H. Bouchta, N. Selhaoui, D.O. Poltetaev, M.A. Boukideur, A. Bendarma, S. Kardellass, A. Marjaoui, M. Zanouni, A. Khadija, Calphad, 87, 102747(2024).
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}
}