# Ru–U phases > Ru–U system: 12 phases (tier A 5, tier C 1, liquid 1, needs_review 5); 11 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references. HTML: https://data.orchid-project.org/phases/pages/RU-U.html · Markdown: https://data.orchid-project.org/phases/pages/RU-U.md 12 phases (tier A 5, tier C 1, liquid 1, needs_review 5); 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](https://orchid-project.org/phases/?q=RU-U) · [full JSON](https://data.orchid-project.org/phases/systems/RU-U.json) · [Ru–U system page](https://data.orchid-project.org/systems/RU-U.html) · [Markdown](https://data.orchid-project.org/phases/pages/RU-U.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Ru–U system (12) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [ORTHORHOMBIC_A20](#phase-ru-u-a20-orthorhombic); _phase:ru-u:a20-orthorhombic_ | alpha-U · A20 · oC4 · Cmcm (63) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1047.02 K, x(U) 1–1 | 0 | 1 | | [BCC_A2](#phase-ru-u-bcc-a2); _phase:ru-u:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 962.06–3999.24 K, x(U) 0.92248–1 | 14 | 1 | | [FCC_A1](#phase-ru-u-fcc-a1); _phase:ru-u: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-u-hcp-a3); _phase:ru-u:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–2676.37 K, x(U) 0–3e-05 | 6 | 1 | | [LIQUID](#phase-ru-u-liquid); _phase:ru-u:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 1149.14–4000 K, x(U) 0–1 | 40 | 1 | | [RU3U_L12](#phase-ru-u-ru3u-l12); _phase:ru-u:ru3u-l12_ | AuCu3 · L1_2 · cP4 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1998.76 K, x(U) 0.25–0.25 | 16 | 1 | | [RU4U3](#phase-ru-u-ru4u3); _phase:ru-u:ru4u3_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1451.77 K, x(U) 0.42857–0.42857 | 10 | 1 | | [RU5U3](#phase-ru-u-ru5u3); _phase:ru-u:ru5u3_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1466.23 K, x(U) 0.375–0.375 | 12 | 1 | | [RUU_HT](#phase-ru-u-ruu-ht); _phase:ru-u:ruu-ht_ | | needs_review | stable in 1 of 1 calculated diagram(s): 1060–1413.54 K, x(U) 0.52–0.52 | 18 | 1 | | [RUU_LT](#phase-ru-u-ruu-lt); _phase:ru-u:ruu-lt_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1405 K, x(U) 0.52–0.52 | 4 | 1 | | [RUU2](#phase-ru-u-ruu2); _phase:ru-u:ruu2_ | RuU2 · mC12 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1218.09 K, x(U) 0.66667–0.66667 | 30 | 1 | | [TETRAGONAL_U](#phase-ru-u-u-tetragonal); _phase:ru-u:u-tetragonal_ | | needs_review | stable in 1 of 1 calculated diagram(s): 900.42–1047.02 K, x(U) 0.97921–1 | 20 | 1 | ## ORTHORHOMBIC_A20 (Ru–U) - Id: `phase:ru-u:a20-orthorhombic`; status `assigned` - Structure: alpha-U · A20 · oC4 · Cmcm (63); type `st:a20-alpha-u-oc4`; tier A: standard phase name; confidence high - Stoichiometry: U 1.0000 - Stability: stable in 1 of 1 calculated diagram(s): 300–1047.02 K, x(U) 1–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:a20-orthorhombic) Names (2): _corpus: _corpus:phase:ru-u:a20-orthorhombic _tdb: _tdb:RuU-11Ber.tdb:ORTHORHOMBIC_A20 ### TDB models of ORTHORHOMBIC_A20 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): ORTHORHOMBIC_A20, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 45: PHASE ORTHORHOMBIC_A20 % 1 1 ! 46: CONST ORTHORHOMBIC_A20 : U : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase_ ## BCC_A2 (Ru–U) - Id: `phase:ru-u: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): 962.06–3999.24 K, x(U) 0.92248–1 - Literature: 14 values (14 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:bcc-a2) Names (3): _corpus: _corpus:phase:ru-u:bcc-a2 _paper: _paper:10.1016/j.jnucmat.2011.01.043:bcc _tdb: _tdb:RuU-11Ber.tdb:BCC_A2 ### TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): BCC_A2, type code %B, sha256 `10085bc2e845e4f3…` ~~~~text 35: PHASE BCC_A2 %B 2 1 3 ! 36: CONST BCC_A2 : RU U : VA : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ - [doi:10.1016/0022-3115(65)90044-9](https://doi.org/10.1016/0022-3115%2865%2990044-9) R.F. Hills, B.W. Howlett, B.R. Butcher, D. Stewart, The effect of cooling rate and composition on the transformation of the gamma-phase in uranium ruthenium alloys (with an appendix on ruthenium as a grain-refining element), Journal of Nuclear Materials 16, 109-128 (1965). _cited as the source of values for this phase_ - [doi:10.1016/0022-5088(76)90244-7](https://doi.org/10.1016/0022-5088%2876%2990244-7) A.A. Abou-Zahra, F.H. Hammad, The uranium-rich region of the uranium-ruthenium binary system, Journal of the Less Common Metals 48, 177-181 (1976). _cited as the source of values for this phase_ ## FCC_A1 (Ru–U) - Id: `phase:ru-u: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](https://orchid-project.org/phases/#phase:ru-u:fcc-a1) Names (2): _corpus: _corpus:phase:ru-u:fcc-a1 _tdb: _tdb:RuU-11Ber.tdb:FCC_A1 ### TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): FCC_A1, type code %A, sha256 `10085bc2e845e4f3…` ~~~~text 30: PHASE FCC_A1 %A 2 1 1 ! 31: CONST FCC_A1 : RU U : VA : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase_ ## HCP_A3 (Ru–U) - Id: `phase:ru-u: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): 300–2676.37 K, x(U) 0–3e-05 - Literature: 6 values (6 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:hcp-a3) Names (3): _corpus: _corpus:phase:ru-u:hcp-a3 _paper: _paper:10.1016/j.jnucmat.2011.01.043:hcp _tdb: _tdb:RuU-11Ber.tdb:HCP_A3 ### TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): HCP_A3, type code %A, sha256 `10085bc2e845e4f3…` ~~~~text 40: PHASE HCP_A3 %A 2 1 0.5 ! 41: CONST HCP_A3 : RU% U : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0022-3115(94)90381-6](https://doi.org/10.1016/0022-3115%2894%2990381-6) Richard E. Mason, Mohamed S. El-Genk, Experimental investigation of the ruthenium-uranium and rhenium-uranium binary systems, Journal of Nuclear Materials 217, 304-321 (1994). _cited as the source of values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ ## LIQUID (Ru–U) - Id: `phase:ru-u:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 1 of 1 calculated diagram(s): 1149.14–4000 K, x(U) 0–1 - Literature: 40 values (40 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:liquid) Names (4): _corpus: _corpus:phase:ru-u:liquid _paper: _paper:10.1016/j.jnucmat.2011.01.043:L, paper:10.1016/j.jnucmat.2011.01.043:Liquid _tdb: _tdb:RuU-11Ber.tdb:LIQUID ### TDB models of LIQUID (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): LIQUID, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 25: PHASE LIQUID:L % 1 1 ! 26: CONST LIQUID:L : RU U : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ - [doi:10.1016/0022-3115(94)90381-6](https://doi.org/10.1016/0022-3115%2894%2990381-6) Richard E. Mason, Mohamed S. El-Genk, Experimental investigation of the ruthenium-uranium and rhenium-uranium binary systems, Journal of Nuclear Materials 217, 304-321 (1994). _cited as the source of values for this phase_ ## RU3U_L12 (Ru–U) - Id: `phase:ru-u:ru3u-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: DFT agrees: on-hull mp-aaaaabwp and oqmd-18098, space group 221 - Stoichiometry: Ru 0.7500, U 0.2500 - Stability: stable in 1 of 1 calculated diagram(s): 300–1998.76 K, x(U) 0.25–0.25 - Literature: 16 values (16 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:ru3u-l12) Names (5): _corpus: _corpus:phase:ru-u:ru3u-l12 _mp: _mp:mp-aaaaabwp _oqmd: _oqmd:oqmd-18098 _paper: _paper:10.1016/j.jnucmat.2011.01.043:Ru3U _tdb: _tdb:RuU-11Ber.tdb:RU3U_L12 ### TDB models of RU3U_L12 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): RU3U_L12, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 55: PHASE RU3U_L12 % 2 3 1 ! 56: CONST RU3U_L12 : RU : U : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0022-3115(94)90381-6](https://doi.org/10.1016/0022-3115%2894%2990381-6) Richard E. Mason, Mohamed S. El-Genk, Experimental investigation of the ruthenium-uranium and rhenium-uranium binary systems, Journal of Nuclear Materials 217, 304-321 (1994). _cited as the source of values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ ## RU4U3 (Ru–U) - Id: `phase:ru-u:ru4u3`; status `needs_review` - No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete - Candidate (literature_printed): (Ru4U3) · ? — printed with a label mapped to this phase - Candidate (sgte_mmc2): (Ru4U3) — Hallstedt 2025 mmc2 row for RU4U3: Ru4U3 - Stoichiometry: Ru 0.5714, U 0.4286 - Stability: stable in 1 of 1 calculated diagram(s): 300–1451.77 K, x(U) 0.42857–0.42857 - Literature: 10 values (10 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:ru4u3) Names (3): _corpus: _corpus:phase:ru-u:ru4u3 _paper: _paper:10.1016/j.jnucmat.2011.01.043:Ru4U3 _tdb: _tdb:RuU-11Ber.tdb:RU4U3 ### TDB models of RU4U3 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): RU4U3, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 65: PHASE RU4U3 % 2 4 3 ! 66: CONST RU4U3 : RU : U : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ - [doi:10.1016/0022-3115(94)90381-6](https://doi.org/10.1016/0022-3115%2894%2990381-6) Richard E. Mason, Mohamed S. El-Genk, Experimental investigation of the ruthenium-uranium and rhenium-uranium binary systems, Journal of Nuclear Materials 217, 304-321 (1994). _cited as the source of values for this phase_ ## RU5U3 (Ru–U) - Id: `phase:ru-u:ru5u3`; status `needs_review` - No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete - Candidate (literature_printed): (Ru5U3) · ? — printed with a label mapped to this phase - Candidate (sgte_mmc2): (Ru5U3) — Hallstedt 2025 mmc2 row for RU5U3: Ru5U3 - Stoichiometry: Ru 0.6250, U 0.3750 - Stability: stable in 1 of 1 calculated diagram(s): 300–1466.23 K, x(U) 0.375–0.375 - Literature: 12 values (12 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:ru5u3) Names (3): _corpus: _corpus:phase:ru-u:ru5u3 _paper: _paper:10.1016/j.jnucmat.2011.01.043:Ru5U3 _tdb: _tdb:RuU-11Ber.tdb:RU5U3 ### TDB models of RU5U3 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): RU5U3, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 60: PHASE RU5U3 % 2 5 3 ! 61: CONST RU5U3 : RU : U : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0022-3115(94)90381-6](https://doi.org/10.1016/0022-3115%2894%2990381-6) Richard E. Mason, Mohamed S. El-Genk, Experimental investigation of the ruthenium-uranium and rhenium-uranium binary systems, Journal of Nuclear Materials 217, 304-321 (1994). _cited as the source of values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ ## RUU_HT (Ru–U) - Id: `phase:ru-u:ruu-ht`; status `needs_review` - No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete - Candidate (literature_printed): (RuU-HT) · ? — printed with a label mapped to this phase - Candidate (sgte_mmc2): (RuU-HT) — Hallstedt 2025 mmc2 row for RUU_HT: RuU (high T) - Stoichiometry: Ru 0.4800, U 0.5200 - Stability: stable in 1 of 1 calculated diagram(s): 1060–1413.54 K, x(U) 0.52–0.52 - Literature: 18 values (18 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:ruu-ht) Names (3): _corpus: _corpus:phase:ru-u:ruu-ht _paper: _paper:10.1016/j.jnucmat.2011.01.043:RuU-H _tdb: _tdb:RuU-11Ber.tdb:RUU_HT ### TDB models of RUU_HT (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): RUU_HT, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 75: PHASE RUU_HT % 2 0.48 0.52 ! 76: CONST RUU_HT : RU : U : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ ## RUU_LT (Ru–U) - Id: `phase:ru-u:ruu-lt`; status `needs_review` - No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete - Candidate (literature_printed): (RuU-LT) · ? — printed with a label mapped to this phase - Candidate (sgte_mmc2): (RuU-LT) — Hallstedt 2025 mmc2 row for RUU_LT: RuU (low T) - Stoichiometry: Ru 0.4800, U 0.5200 - Stability: stable in 1 of 1 calculated diagram(s): 300–1405 K, x(U) 0.52–0.52 - Literature: 4 values (4 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:ruu-lt) Names (3): _corpus: _corpus:phase:ru-u:ruu-lt _paper: _paper:10.1016/j.jnucmat.2011.01.043:RuU-L _tdb: _tdb:RuU-11Ber.tdb:RUU_LT ### TDB models of RUU_LT (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): RUU_LT, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 70: PHASE RUU_LT % 2 0.48 0.52 ! 71: CONST RUU_LT : RU : U : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ ## RUU2 (Ru–U) - Id: `phase:ru-u:ruu2`; status `assigned` - Structure: RuU2 · mC12 · C2/m (12); type `st:ruu2-mc12`; 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](https://doi.org/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 0.3333, U 0.6667 - Stability: stable in 1 of 1 calculated diagram(s): 300–1218.09 K, x(U) 0.66667–0.66667 - Literature: 30 values (30 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:ruu2) Names (3): _corpus: _corpus:phase:ru-u:ruu2 _paper: _paper:10.1016/j.jnucmat.2011.01.043:RuU2 _tdb: _tdb:RuU-11Ber.tdb:RUU2 ### TDB models of RUU2 (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): RUU2, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 80: PHASE RUU2 % 2 1 2 ! 81: CONST RUU2 : RU : U : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _cited as the source of values for this phase_ - [doi:10.1016/0022-3115(65)90044-9](https://doi.org/10.1016/0022-3115%2865%2990044-9) R.F. Hills, B.W. Howlett, B.R. Butcher, D. Stewart, The effect of cooling rate and composition on the transformation of the gamma-phase in uranium ruthenium alloys (with an appendix on ruthenium as a grain-refining element), Journal of Nuclear Materials 16, 109-128 (1965). _cited as the source of values for this phase_ - [doi:10.1016/0022-5088(76)90244-7](https://doi.org/10.1016/0022-5088%2876%2990244-7) A.A. Abou-Zahra, F.H. Hammad, The uranium-rich region of the uranium-ruthenium binary system, Journal of the Less Common Metals 48, 177-181 (1976). _cited as the source of values for this phase_ ## TETRAGONAL_U (Ru–U) - Id: `phase:ru-u:u-tetragonal`; status `needs_review` - No structure assigned. Why: name_has_descriptive_tokens:TETRAGONAL; no_structure_token - Candidate (sgte_mmc2): beta-U · A_b · tP30 · P4_2/mnm (136) — Hallstedt 2025 mmc2 row for TETRAGONAL_U: beta-U - Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — RuU-11Ber.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)' - Stability: stable in 1 of 1 calculated diagram(s): 900.42–1047.02 K, x(U) 0.97921–1 - Literature: 20 values (20 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ru-u:u-tetragonal) Names (3): _corpus: _corpus:phase:ru-u:u-tetragonal _paper: _paper:10.1016/j.jnucmat.2011.01.043:β-U _tdb: _tdb:RuU-11Ber.tdb:TETRAGONAL_U ### TDB models of TETRAGONAL_U (1): PHASE and CONSTITUENT statements as written [RuU-11Ber.tdb](https://orchid-project.org/data/databases/sgte-binary/RuU-11Ber.tdb): TETRAGONAL_U, type code %, sha256 `10085bc2e845e4f3…` ~~~~text 50: PHASE TETRAGONAL_U % 1 1 ! 51: CONST TETRAGONAL_U : RU U% : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/j.jnucmat.2011.01.043](https://doi.org/10.1016/j.jnucmat.2011.01.043) A. Berche, N. Dupin, C. Guéneau, C. Rado, B. Sundman, J.C. Dumas, Calphad thermodynamic description of some binary systems involving U, Journal of Nuclear Materials 411, 131-143 (2011). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/0022-3115(65)90044-9](https://doi.org/10.1016/0022-3115%2865%2990044-9) R.F. Hills, B.W. Howlett, B.R. Butcher, D. Stewart, The effect of cooling rate and composition on the transformation of the gamma-phase in uranium ruthenium alloys (with an appendix on ruthenium as a grain-refining element), Journal of Nuclear Materials 16, 109-128 (1965). _cited as the source of values for this phase_ - [doi:10.1016/0022-5088(76)90244-7](https://doi.org/10.1016/0022-5088%2876%2990244-7) A.A. Abou-Zahra, F.H. Hammad, The uranium-rich region of the uranium-ruthenium binary system, Journal of the Less Common Metals 48, 177-181 (1976). _cited as the source of values for this phase_ - [doi:10.6028/jres.072a.001](https://doi.org/10.6028/jres.072a.001) John J. Park, Reactions of uranium with the platinide elements. I. The uranium-ruthenium system, J. RES. NATL. BUR. STAN. SECT. A. 72A, 1 (1968). _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). https://doi.org/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). https://doi.org/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. ```bibtex @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} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).