Cr–Ru phases

7 phases (tier A 4, liquid 1, needs_review 2); 6 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 · Cr–Ru system page · Markdown · field reference

Phases of the Cr–Ru system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:cr-ru:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2180.98 K, x(Ru) 0–0.32063	13	2
CR2RU_D8B phase:cr-ru:cr2ru-d8b		needs_review	stable in 1 of 1 calculated diagram(s): 1106.06–1841.2 K, x(Ru) 0.33333–0.33333	6	1
CR3RU_A15 phase:cr-ru:cr3ru-a15		needs_review	stable in 2 of 2 calculated diagram(s): 1022.26–1272.95 K, x(Ru) 0.25–0.315	15	2
SIGMA_D8B phase:cr-ru:d8b-sigma	sigma-CrFe · D8_b · tP30 · P4_2/mnm (136)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1072.87–1852.76 K, x(Ru) 0.31166–0.35329	9	1
FCC_A1 phase:cr-ru:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
HCP_A3 phase:cr-ru:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–3999.5 K, x(Ru) 0.46554–1	13	2
LIQUID phase:cr-ru:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1880.45–4000 K, x(Ru) 0–1	4	2

BCC_A2 (Cr–Ru)

Id: phase:cr-ru: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 2 of 2 calculated diagram(s): 300–2180.98 K, x(Ru) 0–0.32063
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cr-ru:bcc-a2
paper: paper:10.1016/j.intermet.2015.04.011:bcc (Cr), paper:10.1016/j.intermet.2015.04.011:bcc(Cr)
tdb: tdb:CrRu-05Che-LB.tdb:BCC_A2, tdb:CrRu-15Zhu.tdb:BCC_A2

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

CrRu-05Che-LB.tdb: BCC_A2, type code %B, sha256 6aaa1a7c6fe998e3…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : CR% RU : VA : !

CrRu-15Zhu.tdb: BCC_A2, type code %B, sha256 8548a182cf1b5ea4…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : CR% RU : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.intermet.2015.04.011 L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Experimental determination of the Ni–Cr–Ru phase diagram and thermodynamic reassessments of the Cr–Ru and Ni–Cr–Ru systems, Intermetallics 64, 86-95 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02873189 M. Venkatraman, J. P. Neumann, The Cr−Ru (chromium-ruthenium) system, JPE 8, 109-112 (1987).
cited as the source of values for this phase

CR2RU_D8B (Cr–Ru)

Id: phase:cr-ru:cr2ru-d8b; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_D8_b; stoichiometry_contradicts_D8_b:CrRu-05Che-LB.tdb
Candidate (literature_printed): CrFe · tP30 — printed with a label mapped to this phase
Candidate (name_token): sigma-CrFe · D8_b · tP30 · P4_2/mnm (136) — Strukturbericht/word 'D8B' in the TDB name
Candidate (sgte_mmc2): sigma-CrFe · D8_b · tP30 · P4_2/mnm (136) — Hallstedt 2025 mmc2 row for CR2RU_D8B: Cr2Ru
Candidate (tdb_comment): CrFe · tP30 · P4_2/mnm — CrRu-05Che-LB.tdb: 'Prototype CrFe (tP30, P4_2/mnm) sigma'
Stoichiometry: Cr 0.6667, Ru 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 1106.06–1841.2 K, x(Ru) 0.33333–0.33333
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-ru:cr2ru-d8b
paper: paper:10.1016/s1001-0521(06)60106-x:Cr2Ru
tdb: tdb:CrRu-05Che-LB.tdb:CR2RU_D8B

TDB models of CR2RU_D8B (1): PHASE and CONSTITUENT statements as written

CrRu-05Che-LB.tdb: CR2RU_D8B, type code %, sha256 6aaa1a7c6fe998e3…

46: PHASE CR2RU_D8B % 2 2 1 !
47: CONST CR2RU_D8B : CR : RU : !

Example references (1 of 1; assessments first):

doi:10.1016/s1001-0521(06)60106-x A WATSON, L CORNISH, R SUSS, Development of a database for the prediction of phases in Pt-based Superalloys: Cr-Pt-Ru, Rare Metals 25, 597-607 (2006).
reports values for this phase

CR3RU_A15 (Cr–Ru)

Id: phase:cr-ru:cr3ru-a15; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:models_disagree_on_composition; models_disagree_on_composition; stoichiometry_contradicts_A15:CrRu-15Zhu.tdb
Candidate (literature_printed): Cr3Si · cP8 — printed with a label mapped to this phase
Candidate (name_token): Cr3Si · A15 · cP8 · Pm-3n (223) — Strukturbericht/word 'A15' in the TDB name
Candidate (sgte_mmc2): Cr3Si · A15 · cP8 · Pm-3n (223) — Hallstedt 2025 mmc2 row for CR3RU_A15: Cr3Ru
Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — CrRu-05Che-LB.tdb: 'Prototype Cr3Si (cP8, Pm-3n)'
Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — CrRu-15Zhu.tdb: 'Prototype Cr3Si (cP8, Pm-3n)'
Stability: stable in 2 of 2 calculated diagram(s): 1022.26–1272.95 K, x(Ru) 0.25–0.315
Literature: 15 values (15 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cr-ru:cr3ru-a15
paper: paper:10.1016/j.intermet.2015.04.011:Cr3Ru, paper:10.1016/s1001-0521(06)60106-x:Cr3Ru
tdb: tdb:CrRu-05Che-LB.tdb:CR3RU_A15, tdb:CrRu-15Zhu.tdb:CR3RU_A15

TDB models of CR3RU_A15 (2): PHASE and CONSTITUENT statements as written

CrRu-05Che-LB.tdb: CR3RU_A15, type code %, sha256 6aaa1a7c6fe998e3…

41: PHASE CR3RU_A15 % 2 3 1 !
42: CONST CR3RU_A15 : CR : RU : !

CrRu-15Zhu.tdb: CR3RU_A15, type code %, sha256 8548a182cf1b5ea4…

40: PHASE CR3RU_A15 % 2 0.685 0.315 !
41: CONST CR3RU_A15 : CR : RU : !

Example references (3 of 3; assessments first):

doi:10.1016/j.intermet.2015.04.011 L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Experimental determination of the Ni–Cr–Ru phase diagram and thermodynamic reassessments of the Cr–Ru and Ni–Cr–Ru systems, Intermetallics 64, 86-95 (2015).
assessment that models this phase; reports values for this phase
doi:10.1016/s1001-0521(06)60106-x A WATSON, L CORNISH, R SUSS, Development of a database for the prediction of phases in Pt-based Superalloys: Cr-Pt-Ru, Rare Metals 25, 597-607 (2006).
reports values for this phase
doi:10.1007/bf02873189 M. Venkatraman, J. P. Neumann, The Cr−Ru (chromium-ruthenium) system, JPE 8, 109-112 (1987).
cited as the source of values for this phase

SIGMA_D8B (Cr–Ru)

Id: phase:cr-ru:d8b-sigma; status assigned
Structure: sigma-CrFe · D8_b · tP30 · P4_2/mnm (136); type st:d8-b-sigma-crfe-tp30; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in CrRu-15Zhu.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 1072.87–1852.76 K, x(Ru) 0.31166–0.35329
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cr-ru:d8b-sigma, corpus:phase:cr-ru:sigma-d8b
paper: paper:10.1016/j.intermet.2015.04.011:σ
tdb: tdb:CrRu-15Zhu.tdb:SIGMA_D8B

TDB models of SIGMA_D8B (1): PHASE and CONSTITUENT statements as written

CrRu-15Zhu.tdb: SIGMA_D8B, type code %, sha256 8548a182cf1b5ea4…

45: PHASE SIGMA_D8B % 2 20 10 !
46: CONST SIGMA_D8B : CR% RU : CR RU% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.intermet.2015.04.011 L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Experimental determination of the Ni–Cr–Ru phase diagram and thermodynamic reassessments of the Cr–Ru and Ni–Cr–Ru systems, Intermetallics 64, 86-95 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02873189 M. Venkatraman, J. P. Neumann, The Cr−Ru (chromium-ruthenium) system, JPE 8, 109-112 (1987).
cited as the source of values for this phase

FCC_A1 (Cr–Ru)

Id: phase:cr-ru: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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-ru:fcc-a1
tdb: tdb:CrRu-05Che-LB.tdb:FCC_A1, tdb:CrRu-15Zhu.tdb:FCC_A1

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

CrRu-05Che-LB.tdb: FCC_A1, type code %A, sha256 6aaa1a7c6fe998e3…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : CR RU : VA : !

CrRu-15Zhu.tdb: FCC_A1, type code %A, sha256 8548a182cf1b5ea4…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : CR RU : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.intermet.2015.04.011 L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Experimental determination of the Ni–Cr–Ru phase diagram and thermodynamic reassessments of the Cr–Ru and Ni–Cr–Ru systems, Intermetallics 64, 86-95 (2015).
assessment that models this phase

HCP_A3 (Cr–Ru)

Id: phase:cr-ru: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 2 of 2 calculated diagram(s): 300–3999.5 K, x(Ru) 0.46554–1
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cr-ru:hcp-a3
paper: paper:10.1016/j.intermet.2015.04.011:hcp (Ru)
tdb: tdb:CrRu-05Che-LB.tdb:HCP_A3, tdb:CrRu-15Zhu.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

CrRu-05Che-LB.tdb: HCP_A3, type code %A, sha256 6aaa1a7c6fe998e3…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : CR RU% : VA : !

CrRu-15Zhu.tdb: HCP_A3, type code %A, sha256 8548a182cf1b5ea4…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : CR RU% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.intermet.2015.04.011 L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Experimental determination of the Ni–Cr–Ru phase diagram and thermodynamic reassessments of the Cr–Ru and Ni–Cr–Ru systems, Intermetallics 64, 86-95 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02873189 M. Venkatraman, J. P. Neumann, The Cr−Ru (chromium-ruthenium) system, JPE 8, 109-112 (1987).
cited as the source of values for this phase

LIQUID (Cr–Ru)

Id: phase:cr-ru:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1880.45–4000 K, x(Ru) 0–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cr-ru:liquid
paper: paper:10.1016/j.intermet.2015.04.011:L
tdb: tdb:CrRu-05Che-LB.tdb:LIQUID, tdb:CrRu-15Zhu.tdb:LIQUID

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

CrRu-05Che-LB.tdb: LIQUID, type code %, sha256 6aaa1a7c6fe998e3…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : CR RU : !

CrRu-15Zhu.tdb: LIQUID, type code %, sha256 8548a182cf1b5ea4…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : CR RU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.intermet.2015.04.011 L.L. Zhu, H.Y. Qi, L. Jiang, Z.P. Jin, J.-C. Zhao, Experimental determination of the Ni–Cr–Ru phase diagram and thermodynamic reassessments of the Cr–Ru and Ni–Cr–Ru systems, Intermetallics 64, 86-95 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02873189 M. Venkatraman, J. P. Neumann, The Cr−Ru (chromium-ruthenium) system, JPE 8, 109-112 (1987).
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}
}