Re–U phases

8 phases (tier A 4, liquid 1, needs_review 3); 7 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 · Re–U system page · Markdown · field reference

Phases of the Re–U system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A20 phase:re-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	2	1
BCC_A2 phase:re-u:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 962.7–1411.51 K, x(U) 0.88657–1	8	1
FCC_A1 phase:re-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:re-u:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–3494.94 K, x(U) 0–0.00502	5	1
LIQUID phase:re-u:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1379.79–4000 K, x(U) 0–1	12	1
RE2U phase:re-u:re2u		needs_review	stable in 1 of 1 calculated diagram(s): 300–2498.84 K, x(U) 0.33333–0.33333	14	1
REU2 phase:re-u:reu2		needs_review	stable in 1 of 1 calculated diagram(s): 300–1019.9 K, x(U) 0.66667–0.66667	6	1
TETRAGONAL_U phase:re-u:u-tetragonal		needs_review	stable in 1 of 1 calculated diagram(s): 907.59–1048.99 K, x(U) 0.97931–1	4	1

ORTHORHOMBIC_A20 (Re–U)

Id: phase:re-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: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:re-u:a20-orthorhombic, corpus:phase:re-u:orthorhombic-a20
paper: paper:10.1016/j.jnucmat.2011.01.043:α-U
tdb: tdb:ReU-11Ber.tdb:ORTHORHOMBIC_A20

TDB models of ORTHORHOMBIC_A20 (1): PHASE and CONSTITUENT statements as written

ReU-11Ber.tdb: ORTHORHOMBIC_A20, type code %, sha256 a43b5b0bf7f00026…

42: PHASE ORTHORHOMBIC_A20 % 1 1 !
43: CONST ORTHORHOMBIC_A20 : U : !

Example references (2 of 2; assessments first):

doi: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:10.1016/0022-5088(63)90059-6 R.J. Jackson, D.E. Williams, W.L. Larsen, The uraniumrhenium alloy system, Journal of the Less Common Metals 5, 443-461 (1963).
cited as the source of values for this phase

BCC_A2 (Re–U)

Id: phase:re-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): 962.7–1411.51 K, x(U) 0.88657–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-u:bcc-a2
paper: paper:10.1016/j.jnucmat.2011.01.043:γ-U
tdb: tdb:ReU-11Ber.tdb:BCC_A2

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

ReU-11Ber.tdb: BCC_A2, type code %B, sha256 a43b5b0bf7f00026…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : RE U : VA : !

Example references (3 of 3; assessments first):

doi: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:10.1016/0022-5088(63)90059-6 R.J. Jackson, D.E. Williams, W.L. Larsen, The uraniumrhenium alloy system, Journal of the Less Common Metals 5, 443-461 (1963).
cited as the source of values for this phase
doi:10.1016/0022-3115(77)90078-2 S.P. Garg, R.J. Ackermann, The high temperature phase diagrams for Th-Mo, Th-Re, U-Mo, and U-Re; derived thermodynamic properties of refractory metal solutes in liquid thorium and uranium, Journal of Nuclear Materials 64, 265-274 (1977).
cited as the source of values for this phase

FCC_A1 (Re–U)

Id: phase:re-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

Names (2): corpus: corpus:phase:re-u:fcc-a1
tdb: tdb:ReU-11Ber.tdb:FCC_A1

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

ReU-11Ber.tdb: FCC_A1, type code %A, sha256 a43b5b0bf7f00026…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : RE U : VA : !

Example references (1 of 1; assessments first):

doi: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 (Re–U)

Id: phase:re-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): 300–3494.94 K, x(U) 0–0.00502
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-u:hcp-a3
paper: paper:10.1016/j.jnucmat.2011.01.043:(Re)
tdb: tdb:ReU-11Ber.tdb:HCP_A3

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

ReU-11Ber.tdb: HCP_A3, type code %A, sha256 a43b5b0bf7f00026…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : RE% U : VA : !

Example references (4 of 4; assessments first):

doi: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(77)90078-2 S.P. Garg, R.J. Ackermann, The high temperature phase diagrams for Th-Mo, Th-Re, U-Mo, and U-Re; derived thermodynamic properties of refractory metal solutes in liquid thorium and uranium, Journal of Nuclear Materials 64, 265-274 (1977).
cited as the source of values for this phase
doi:10.1016/0022-3115(94)90381-6 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:10.1016/0022-5088(63)90059-6 R.J. Jackson, D.E. Williams, W.L. Larsen, The uraniumrhenium alloy system, Journal of the Less Common Metals 5, 443-461 (1963).
cited as the source of values for this phase

LIQUID (Re–U)

Id: phase:re-u:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1379.79–4000 K, x(U) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-u:liquid
paper: paper:10.1016/j.jnucmat.2011.01.043:Liquid
tdb: tdb:ReU-11Ber.tdb:LIQUID

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

ReU-11Ber.tdb: LIQUID, type code %, sha256 a43b5b0bf7f00026…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : RE U : !

Example references (4 of 4; assessments first):

doi: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:10.1016/0022-5088(63)90059-6 R.J. Jackson, D.E. Williams, W.L. Larsen, The uraniumrhenium alloy system, Journal of the Less Common Metals 5, 443-461 (1963).
cited as the source of values for this phase
doi:10.1016/0022-3115(77)90078-2 S.P. Garg, R.J. Ackermann, The high temperature phase diagrams for Th-Mo, Th-Re, U-Mo, and U-Re; derived thermodynamic properties of refractory metal solutes in liquid thorium and uranium, Journal of Nuclear Materials 64, 265-274 (1977).
cited as the source of values for this phase
doi:10.1016/0022-3115(94)90381-6 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

RE2U (Re–U)

Id: phase:re-u:re2u; status needs_review
No structure assigned. Why: dft_space_group_63_matches_4_structure_types; no_structure_token; sgte_mmc2_row_disagrees_with_dft; sgte_mmc2_rows_disagree
Candidate (dft_mp): Cmcm (63) — on-hull MP URe2 at x(U)=0.3333
Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD Re2 U1 at x(U)=0.3333
Candidate (dft_space_group_and_stoichiometry): Au2V · oC12 · Cmcm (63) — space group 63 and stoichiometry match
Candidate (dft_space_group_and_stoichiometry): ZrSi2 · C49 · oC12 · Cmcm (63) — space group 63 and stoichiometry match
Candidate (dft_space_group_and_stoichiometry): GaLi2 · oC12 · Cmcm (63) — space group 63 and stoichiometry match
Candidate (dft_space_group_and_stoichiometry): Re2U · oC24 · Cmcm (63) — space group 63 and stoichiometry match
Candidate (literature_printed): MgZn2 · hP12 — printed with a label mapped to this phase
Candidate (sgte_mmc2): MgZn2 · C14 · hP12 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for RE2U: Re2U (high T, see also Re2U)
Stoichiometry: Re 0.6667, U 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–2498.84 K, x(U) 0.33333–0.33333
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-u:re2u
paper: paper:10.1016/j.jnucmat.2011.01.043:URe2
tdb: tdb:ReU-11Ber.tdb:RE2U

TDB models of RE2U (1): PHASE and CONSTITUENT statements as written

ReU-11Ber.tdb: RE2U, type code %, sha256 a43b5b0bf7f00026…

53: PHASE RE2U % 2 2 1 !
54: CONST RE2U : RE : U : !

Example references (4 of 4; assessments first):

doi: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:10.1016/0022-5088(63)90059-6 R.J. Jackson, D.E. Williams, W.L. Larsen, The uraniumrhenium alloy system, Journal of the Less Common Metals 5, 443-461 (1963).
cited as the source of values for this phase
doi:10.1016/0022-3115(77)90078-2 S.P. Garg, R.J. Ackermann, The high temperature phase diagrams for Th-Mo, Th-Re, U-Mo, and U-Re; derived thermodynamic properties of refractory metal solutes in liquid thorium and uranium, Journal of Nuclear Materials 64, 265-274 (1977).
cited as the source of values for this phase
doi:10.1016/0022-3115(94)90381-6 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

REU2 (Re–U)

Id: phase:re-u:reu2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (ReU2) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (ReU2) — Hallstedt 2025 mmc2 row for REU2: ReU2
Stoichiometry: Re 0.3333, U 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1019.9 K, x(U) 0.66667–0.66667
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:re-u:reu2
paper: paper:10.1016/j.jnucmat.2011.01.043:U2Re
tdb: tdb:ReU-11Ber.tdb:REU2

TDB models of REU2 (1): PHASE and CONSTITUENT statements as written

ReU-11Ber.tdb: REU2, type code %, sha256 a43b5b0bf7f00026…

58: PHASE REU2 % 2 1 2 !
59: CONST REU2 : RE : U : !

Example references (2 of 2; assessments first):

doi: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:10.1016/0022-5088(63)90059-6 R.J. Jackson, D.E. Williams, W.L. Larsen, The uraniumrhenium alloy system, Journal of the Less Common Metals 5, 443-461 (1963).
cited as the source of values for this phase

TETRAGONAL_U (Re–U)

Id: phase:re-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 — ReU-11Ber.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Stability: stable in 1 of 1 calculated diagram(s): 907.59–1048.99 K, x(U) 0.97931–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:re-u:u-tetragonal, corpus:phase:re-u:tetragonal-u
paper: paper:10.1016/j.jnucmat.2011.01.043:β-U
tdb: tdb:ReU-11Ber.tdb:TETRAGONAL_U

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

ReU-11Ber.tdb: TETRAGONAL_U, type code %, sha256 a43b5b0bf7f00026…

47: PHASE TETRAGONAL_U % 1 1 !
48: CONST TETRAGONAL_U : RE U% : !

Example references (2 of 2; assessments first):

doi: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:10.1016/0022-5088(63)90059-6 R.J. Jackson, D.E. Williams, W.L. Larsen, The uraniumrhenium alloy system, Journal of the Less Common Metals 5, 443-461 (1963).
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}
}