Ru–Y phases

9 phases (tier A 5, tier C 3, liquid 1); 8 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 · Ru–Y system page · Markdown · field reference

Phases of the Ru–Y system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:ru-y:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1751–3999.75 K, x(Y) 0.99996–1	2	1
FCC_A1 phase:ru-y:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
HCP_A3 phase:ru-y:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2635.93 K, x(Y) 0–1	8	1
LIQUID phase:ru-y:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1357.86–4000 K, x(Y) 0–1	26	1
RU25Y44 phase:ru-y:ru25y44	Ru25Y44 · oP276 · Pnna (52)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1546.93 K, x(Y) 0.63768–0.63768	8	1
RU2Y_C14 phase:ru-y:ru2y-c14	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2248.43 K, x(Y) 0.33333–0.33333	12	1
RU2Y3 phase:ru-y:ru2y3	Er3Ru2 · hP10 · P6_3/m (176)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 310.97–1568.17 K, x(Y) 0.6–0.6	8	1
RU2Y5 phase:ru-y:ru2y5	Mn5C2 · mC28 · C2/c (15)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1573.39 K, x(Y) 0.71429–0.71429	12	1
RUY3_D011 phase:ru-y:ruy3-d011	Fe3C · D0_11 · oP16 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 315.35–1509.78 K, x(Y) 0.75–0.75	8	1

BCC_A2 (Ru–Y)

Id: phase:ru-y: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): 1751–3999.75 K, x(Y) 0.99996–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-y:bcc-a2
paper: paper:10.1007/s10973-010-1076-2:βY
tdb: tdb:RuY-11Ait.tdb:BCC_A2

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

RuY-11Ait.tdb: BCC_A2, type code %B, sha256 67a1011da0969b03…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : RU Y% : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase

FCC_A1 (Ru–Y)

Id: phase:ru-y: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 (2): corpus: corpus:phase:ru-y:fcc-a1
tdb: tdb:RuY-11Ait.tdb:FCC_A1

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

RuY-11Ait.tdb: FCC_A1, type code %A, sha256 67a1011da0969b03…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : RU Y : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase

HCP_A3 (Ru–Y)

Id: phase:ru-y: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): 300–2635.93 K, x(Y) 0–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ru-y:hcp-a3
paper: paper:10.1007/s10973-010-1076-2:Ru, paper:10.1007/s10973-010-1076-2:αY
tdb: tdb:RuY-11Ait.tdb:HCP_A3

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

RuY-11Ait.tdb: HCP_A3, type code %A, sha256 67a1011da0969b03…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : RU% Y% : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase
doi:10.1006/jssc.1998.7795 Selhaoui N, Charles J, Kleppa OJ, Bouirden L, Gachon JC. The Ruthenuim-Yttrium system: an experimental calorimetric study with a phase diagram optimization. J Solid State Chem. 1998; 138:302–6.
cited as the source of values for this phase

LIQUID (Ru–Y)

Id: phase:ru-y:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1357.86–4000 K, x(Y) 0–1
Literature: 26 values (26 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-y:liquid
paper: paper:10.1007/s10973-010-1076-2:Liq
tdb: tdb:RuY-11Ait.tdb:LIQUID

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

RuY-11Ait.tdb: LIQUID, type code %, sha256 67a1011da0969b03…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : RU Y : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase
doi:10.1006/jssc.1998.7795 Selhaoui N, Charles J, Kleppa OJ, Bouirden L, Gachon JC. The Ruthenuim-Yttrium system: an experimental calorimetric study with a phase diagram optimization. J Solid State Chem. 1998; 138:302–6.
cited as the source of values for this phase

RU25Y44 (Ru–Y)

Id: phase:ru-y:ru25y44; status assigned
Structure: Ru25Y44 · oP276 · Pnna (52); type st:ru25y44-op276; 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_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ru 0.3623, Y 0.6377
Stability: stable in 1 of 1 calculated diagram(s): 300–1546.93 K, x(Y) 0.63768–0.63768
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-y:ru25y44
paper: paper:10.1007/s10973-010-1076-2:Ru25Y44
tdb: tdb:RuY-11Ait.tdb:RU25Y44

TDB models of RU25Y44 (1): PHASE and CONSTITUENT statements as written

RuY-11Ait.tdb: RU25Y44, type code %, sha256 67a1011da0969b03…

58: PHASE RU25Y44 % 2 25 44 !
59: CONST RU25Y44 : RU : Y : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase
doi:10.1006/jssc.1998.7795 Selhaoui N, Charles J, Kleppa OJ, Bouirden L, Gachon JC. The Ruthenuim-Yttrium system: an experimental calorimetric study with a phase diagram optimization. J Solid State Chem. 1998; 138:302–6.
cited as the source of values for this phase

RU2Y_C14 (Ru–Y)

Id: phase:ru-y:ru2y-c14; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabgini and oqmd-19316, space group 194
Stoichiometry: Ru 0.6667, Y 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–2248.43 K, x(Y) 0.33333–0.33333
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ru-y:ru2y-c14
mp: mp:mp-aaabgini
oqmd: oqmd:oqmd-19316
paper: paper:10.1007/s10973-010-1076-2:Ru2Y
tdb: tdb:RuY-11Ait.tdb:RU2Y_C14

TDB models of RU2Y_C14 (1): PHASE and CONSTITUENT statements as written

RuY-11Ait.tdb: RU2Y_C14, type code %, sha256 67a1011da0969b03…

48: PHASE RU2Y_C14 % 2 2 1 !
49: CONST RU2Y_C14 : RU : Y : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase
doi:10.1006/jssc.1998.7795 Selhaoui N, Charles J, Kleppa OJ, Bouirden L, Gachon JC. The Ruthenuim-Yttrium system: an experimental calorimetric study with a phase diagram optimization. J Solid State Chem. 1998; 138:302–6.
cited as the source of values for this phase
doi:10.1051/jcp/1993900435 N Selhaoui, OJ Kleppa, Standard enthalpies of formation of yttrium alloys, Y-Me (Me = Ru, Rh, Pd, Os, Ir, Pt), by high-temperature calorimetry, J. Chim. Phys. 90, 435-443 (1993).
cited as the source of values for this phase

RU2Y3 (Ru–Y)

Id: phase:ru-y:ru2y3; status assigned
Structure: Er3Ru2 · hP10 · P6_3/m (176); type st:er3ru2-hp10; 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_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ru 0.4000, Y 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 310.97–1568.17 K, x(Y) 0.6–0.6
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-y:ru2y3
paper: paper:10.1007/s10973-010-1076-2:Ru2Y3
tdb: tdb:RuY-11Ait.tdb:RU2Y3

TDB models of RU2Y3 (1): PHASE and CONSTITUENT statements as written

RuY-11Ait.tdb: RU2Y3, type code %, sha256 67a1011da0969b03…

53: PHASE RU2Y3 % 2 2 3 !
54: CONST RU2Y3 : RU : Y : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase
doi:10.1006/jssc.1998.7795 Selhaoui N, Charles J, Kleppa OJ, Bouirden L, Gachon JC. The Ruthenuim-Yttrium system: an experimental calorimetric study with a phase diagram optimization. J Solid State Chem. 1998; 138:302–6.
cited as the source of values for this phase

RU2Y5 (Ru–Y)

Id: phase:ru-y:ru2y5; status assigned
Structure: Mn5C2 · mC28 · C2/c (15); type st:mn5c2-mc28; 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_15_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ru 0.2857, Y 0.7143
Stability: stable in 1 of 1 calculated diagram(s): 300–1573.39 K, x(Y) 0.71429–0.71429
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-y:ru2y5
paper: paper:10.1007/s10973-010-1076-2:Ru2Y5
tdb: tdb:RuY-11Ait.tdb:RU2Y5

TDB models of RU2Y5 (1): PHASE and CONSTITUENT statements as written

RuY-11Ait.tdb: RU2Y5, type code %, sha256 67a1011da0969b03…

63: PHASE RU2Y5 % 2 2 5 !
64: CONST RU2Y5 : RU : Y : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase
doi:10.1006/jssc.1998.7795 Selhaoui N, Charles J, Kleppa OJ, Bouirden L, Gachon JC. The Ruthenuim-Yttrium system: an experimental calorimetric study with a phase diagram optimization. J Solid State Chem. 1998; 138:302–6.
cited as the source of values for this phase
doi:10.1051/jcp/1993900435 N Selhaoui, OJ Kleppa, Standard enthalpies of formation of yttrium alloys, Y-Me (Me = Ru, Rh, Pd, Os, Ir, Pt), by high-temperature calorimetry, J. Chim. Phys. 90, 435-443 (1993).
cited as the source of values for this phase

RUY3_D011 (Ru–Y)

Id: phase:ru-y:ruy3-d011; status assigned
Structure: Fe3C · D0_11 · oP16 · Pnma (62); type st:d0-11-fe3c-op16; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacqsrd and oqmd-1437321, space group 62
Stoichiometry: Ru 0.2500, Y 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 315.35–1509.78 K, x(Y) 0.75–0.75
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ru-y:ruy3-d011
mp: mp:mp-aaacqsrd
oqmd: oqmd:oqmd-1437321
paper: paper:10.1007/s10973-010-1076-2:RuY3
tdb: tdb:RuY-11Ait.tdb:RUY3_D011

TDB models of RUY3_D011 (1): PHASE and CONSTITUENT statements as written

RuY-11Ait.tdb: RUY3_D011, type code %, sha256 67a1011da0969b03…

68: PHASE RUY3_D011 % 2 1 3 !
69: CONST RUY3_D011 : RU : Y : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-010-1076-2 M. Ait Amar, M. Idbenali, N. Selhaoui, K. Mahdouk, A. Aharoune, L. Bouirden, Thermodynamic description of the Ru–Y binary system, J Therm Anal Calorim 103, 141-145 (2011).
assessment that models this phase; reports values for this phase
doi:10.1006/jssc.1998.7795 Selhaoui N, Charles J, Kleppa OJ, Bouirden L, Gachon JC. The Ruthenuim-Yttrium system: an experimental calorimetric study with a phase diagram optimization. J Solid State Chem. 1998; 138:302–6.
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}
}