Ru–Sc phases

11 phases (tier A 6, tier B 1, 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 · Ru–Sc system page · Markdown · field reference

Phases of the Ru–Sc system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:ru-sc:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1320–1818.12 K, x(Sc) 0.93048–1	4	2
B2_BCC phase:ru-sc:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2032.47 K, x(Sc) 0.49387–1	6	1
FCC_A1 phase:ru-sc: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-sc:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2625.97 K, x(Sc) 0–1	6	1
LIQUID phase:ru-sc:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1433.14–4000 K, x(Sc) 0–1	16	1
RU13SC57 phase:ru-sc:ru13sc57	Rh13Sc57 · cP140 · Pm-3 (200)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1542.87 K, x(Sc) 0.81429–0.81429	14	1
RU2SC_C14 phase:ru-sc:ru2sc-c14	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2093.07 K, x(Sc) 0.33333–1	6	1
RU3SC5_D88 phase:ru-sc:ru3sc5-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1572.87 K, x(Sc) 0.625–0.625	6	1
RU4SC11 phase:ru-sc:ru4sc11	Ir4Sc11 · cF120 · Fm-3m (225)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–1343.02 K, x(Sc) 0.73333–0.73333	2	1
RU7SC44 phase:ru-sc:ru7sc44	Mg44Rh7 · cF408 · F-43m (216)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1222.99 K, x(Sc) 0.86275–0.86275	2	1
RUSC2 phase:ru-sc:rusc2	NiTi2 · cF96 · Fd-3m (227)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1403.04 K, x(Sc) 0.66667–0.66667	4	1

BCC_A2 (Ru–Sc)

Id: phase:ru-sc: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): 1320–1818.12 K, x(Sc) 0.93048–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ru-sc:bcc-a2
paper: paper:10.1016/j.jallcom.2006.03.029:bcc(Sc)
tdb: tdb:RuSc-07Du.tdb:A2_BCC, tdb:RuSc-07Du.tdb:BCC_A2

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

RuSc-07Du.tdb: A2_BCC, type code %B, sha256 69e3b912bc65c049…

40: PHASE A2_BCC %B 2 1 3 !
41: CONST A2_BCC : RU SC : VA : !

RuSc-07Du.tdb: BCC_A2, type code %B, sha256 69e3b912bc65c049…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : RU SC : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

B2_BCC (Ru–Sc)

Id: phase:ru-sc:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: RuSc-07Du.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: partitioned order/disorder model in RuSc-07Du.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2032.47 K, x(Sc) 0.49387–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-sc:bcc-b2
paper: paper:10.1016/j.jallcom.2006.03.029:RuSc
tdb: tdb:RuSc-07Du.tdb:B2_BCC

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

RuSc-07Du.tdb: B2_BCC, type code %BO, sha256 69e3b912bc65c049…

45: PHASE B2_BCC %BO 3 0.5 0.5 3 !
46: CONST B2_BCC : RU% SC : RU SC% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

FCC_A1 (Ru–Sc)

Id: phase:ru-sc: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-sc:fcc-a1
tdb: tdb:RuSc-07Du.tdb:FCC_A1

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

RuSc-07Du.tdb: FCC_A1, type code %A, sha256 69e3b912bc65c049…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : RU SC : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase

HCP_A3 (Ru–Sc)

Id: phase:ru-sc: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): 300–2625.97 K, x(Sc) 0–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ru-sc:hcp-a3
paper: paper:10.1016/j.jallcom.2006.03.029:hcp(Ru), paper:10.1016/j.jallcom.2006.03.029:hcp(Sc)
tdb: tdb:RuSc-07Du.tdb:HCP_A3

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

RuSc-07Du.tdb: HCP_A3, type code %, sha256 69e3b912bc65c049…

50: PHASE HCP_A3 % 2 1 0.5 !
51: CONST HCP_A3 : RU% SC% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

LIQUID (Ru–Sc)

Id: phase:ru-sc:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1433.14–4000 K, x(Sc) 0–1
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-sc:liquid
paper: paper:10.1016/j.jallcom.2006.03.029:L
tdb: tdb:RuSc-07Du.tdb:LIQUID

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

RuSc-07Du.tdb: LIQUID, type code %, sha256 69e3b912bc65c049…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : RU SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

RU13SC57 (Ru–Sc)

Id: phase:ru-sc:ru13sc57; status assigned
Structure: Rh13Sc57 · cP140 · Pm-3 (200); type st:rh13sc57-cp140; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ru 0.1857, Sc 0.8143
Stability: stable in 1 of 1 calculated diagram(s): 300–1542.87 K, x(Sc) 0.81429–0.81429
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-sc:ru13sc57
paper: paper:10.1016/j.jallcom.2006.03.029:Ru13Sc57
tdb: tdb:RuSc-07Du.tdb:RU13SC57

TDB models of RU13SC57 (1): PHASE and CONSTITUENT statements as written

RuSc-07Du.tdb: RU13SC57, type code %, sha256 69e3b912bc65c049…

75: PHASE RU13SC57 % 2 13 57 !
76: CONST RU13SC57 : RU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

RU2SC_C14 (Ru–Sc)

Id: phase:ru-sc:ru2sc-c14; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2093.07 K, x(Sc) 0.33333–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-sc:ru2sc-c14
paper: paper:10.1016/j.jallcom.2006.03.029:Ru2Sc
tdb: tdb:RuSc-07Du.tdb:RU2SC_C14

TDB models of RU2SC_C14 (1): PHASE and CONSTITUENT statements as written

RuSc-07Du.tdb: RU2SC_C14, type code %, sha256 69e3b912bc65c049…

55: PHASE RU2SC_C14 % 2 2 1 !
56: CONST RU2SC_C14 : RU% SC : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

RU3SC5_D88 (Ru–Sc)

Id: phase:ru-sc:ru3sc5-d88; status assigned
Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high
Stoichiometry: Ru 0.3750, Sc 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–1572.87 K, x(Sc) 0.625–0.625
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-sc:ru3sc5-d88
paper: paper:10.1016/j.jallcom.2006.03.029:Ru3Sc5
tdb: tdb:RuSc-07Du.tdb:RU3SC5_D88

TDB models of RU3SC5_D88 (1): PHASE and CONSTITUENT statements as written

RuSc-07Du.tdb: RU3SC5_D88, type code %, sha256 69e3b912bc65c049…

60: PHASE RU3SC5_D88 % 2 3 5 !
61: CONST RU3SC5_D88 : RU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

RU4SC11 (Ru–Sc)

Id: phase:ru-sc:ru4sc11; status assigned
Structure: Ir4Sc11 · cF120 · Fm-3m (225); type st:ir4sc11-cf120; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Ru 0.2667, Sc 0.7333
Stability: stable in 1 of 1 calculated diagram(s): 300–1343.02 K, x(Sc) 0.73333–0.73333
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ru-sc:ru4sc11
mp: mp:mp-aaacpymp
oqmd: oqmd:oqmd-2053170
paper: paper:10.1016/j.jallcom.2006.03.029:Ru4Sc11
tdb: tdb:RuSc-07Du.tdb:RU4SC11

TDB models of RU4SC11 (1): PHASE and CONSTITUENT statements as written

RuSc-07Du.tdb: RU4SC11, type code %, sha256 69e3b912bc65c049…

70: PHASE RU4SC11 % 2 4 11 !
71: CONST RU4SC11 : RU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

RU7SC44 (Ru–Sc)

Id: phase:ru-sc:ru7sc44; status assigned
Structure: Mg44Rh7 · cF408 · F-43m (216); type st:mg44rh7-cf408; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ru 0.1373, Sc 0.8627
Stability: stable in 1 of 1 calculated diagram(s): 300–1222.99 K, x(Sc) 0.86275–0.86275
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-sc:ru7sc44
paper: paper:10.1016/j.jallcom.2006.03.029:Ru7Sc44
tdb: tdb:RuSc-07Du.tdb:RU7SC44

TDB models of RU7SC44 (1): PHASE and CONSTITUENT statements as written

RuSc-07Du.tdb: RU7SC44, type code %, sha256 69e3b912bc65c049…

80: PHASE RU7SC44 % 2 7 44 !
81: CONST RU7SC44 : RU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
cited as the source of values for this phase

RUSC2 (Ru–Sc)

Id: phase:ru-sc:rusc2; 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 (no_on_hull_entry_in_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ru 0.3333, Sc 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1403.04 K, x(Sc) 0.66667–0.66667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ru-sc:rusc2
paper: paper:10.1016/j.jallcom.2006.03.029:RuSc2
tdb: tdb:RuSc-07Du.tdb:RUSC2

TDB models of RUSC2 (1): PHASE and CONSTITUENT statements as written

RuSc-07Du.tdb: RUSC2, type code %, sha256 69e3b912bc65c049…

65: PHASE RUSC2 % 2 1 2 !
66: CONST RUSC2 : RU : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.03.029 Zhenmin Du, Zhenquan Jiang, Changrong Li, Thermodynamic optimization of the Ru–Sc system, Journal of Alloys and Compounds 427, 148-152 (2007).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01321-7 V.N. Eremenko, V.G. Khorujaya, P.S. Martsenyuk, K.Ye. Korniyenko, The scandium-ruthenium phase diagram, Journal of Alloys and Compounds 217, 213-217 (1995).
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}
}