U–Zr phases

8 phases (tier A 4, tier C 1, liquid 1, needs_review 2); 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 · U–Zr system page · Markdown · field reference

Phases of the U–Zr system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A20 phase:u-zr:a20-orthorhombic	alpha-U · A20 · oC4 · Cmcm (63)	tier A: standard phase name	stable in 9 of 9 calculated diagram(s): 300–964.93 K, x(Zr) 0–0.01709	9	9
BCC_A2 phase:u-zr:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 9 of 9 calculated diagram(s): 872.18–3999.6 K, x(Zr) 0–1	46	9
FCC_A1 phase:u-zr:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 9 calculated diagram(s)	0	9
HCP_A3 phase:u-zr:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 9 of 9 calculated diagram(s): 300–2123.99 K, x(Zr) 0.98173–1	8	9
LIQUID phase:u-zr:liquid	liquid	liquid	stable in 9 of 9 calculated diagram(s): 1320.49–4000 K, x(Zr) 0–1	0	9
TETRAGONAL_U phase:u-zr:u-tetragonal		needs_review	stable in 9 of 9 calculated diagram(s): 933–1131.44 K, x(Zr) 0–0.01971	13	9
U3ZR7 phase:u-zr:u3zr7		needs_review	stable in 1 of 1 calculated diagram(s): 300–880.85 K, x(Zr) 0.7–0.7	0	1
UZR2_DELTA phase:u-zr:uzr2-delta	Hg2U · hP3 · P6/mmm (191)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 8 of 8 calculated diagram(s): 300–893.38 K, x(Zr) 0.59543–0.89214	16	8

ORTHORHOMBIC_A20 (U–Zr)

Id: phase:u-zr:a20-orthorhombic; status assigned
Structure: alpha-U · A20 · oC4 · Cmcm (63); type st:a20-alpha-u-oc4; tier A: standard phase name; confidence high
Stability: stable in 9 of 9 calculated diagram(s): 300–964.93 K, x(Zr) 0–0.01709
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (12): corpus: corpus:phase:u-zr:a20-orthorhombic, corpus:phase:u-zr:orthorhombic-a20
paper: paper:10.1016/j.jnucmat.2013.07.034:α(U)
tdb: tdb:UZr-04Che-LB.tdb:ORTHORHOMBIC_A20, tdb:UZr-10Kur.tdb:ORTHORHOMBIC_A20, tdb:UZr-13Xio.tdb:ORTHORHOMBIC_A20, tdb:UZr-18Qua.tdb:ORTHORHOMBIC_A20, tdb:UZr-18Xie.tdb:ORTHORHOMBIC_A20, tdb:UZr-25Wil.tdb:ORTHORHOMBIC_A20, tdb:UZr-98AEA.tdb:ORTHORHOMBIC_A20, tdb:UZr-98Che.tdb:ORTHORHOMBIC_A20, tdb:UZr-98Kur.tdb:ORTHORHOMBIC_A20

TDB models of ORTHORHOMBIC_A20 (9): PHASE and CONSTITUENT statements as written

UZr-04Che-LB.tdb: ORTHORHOMBIC_A20, type code %, sha256 6481e0aab32c5025…

40: PHASE ORTHORHOMBIC_A20 % 1 1 !
41: CONST ORTHORHOMBIC_A20 : U% ZR : !

UZr-10Kur.tdb: ORTHORHOMBIC_A20, type code %, sha256 ffe4a27268b05f08…

40: PHASE ORTHORHOMBIC_A20 % 1 1 !
41: CONST ORTHORHOMBIC_A20 : U% ZR : !

UZr-13Xio.tdb: ORTHORHOMBIC_A20, type code %, sha256 eafa259a3af659a1…

40: PHASE ORTHORHOMBIC_A20 % 1 1 !
41: CONST ORTHORHOMBIC_A20 : U% ZR : !

UZr-18Qua.tdb: ORTHORHOMBIC_A20, type code %, sha256 03a5d10eb8a85d30…

43: PHASE ORTHORHOMBIC_A20 % 1 1 !
44: CONST ORTHORHOMBIC_A20 : U% ZR : !

UZr-18Xie.tdb: ORTHORHOMBIC_A20, type code %, sha256 7469615c052eb943…

44: PHASE ORTHORHOMBIC_A20 % 1 1 !
45: CONST ORTHORHOMBIC_A20 : U% ZR : !

UZr-25Wil.tdb: ORTHORHOMBIC_A20, type code %, sha256 82222cb1e3065b7a…

45: PHASE ORTHORHOMBIC_A20 % 1 1 !
46: CONST ORTHORHOMBIC_A20 : U% ZR : !

UZr-98AEA.tdb: ORTHORHOMBIC_A20, type code %, sha256 bcf26f6ed9ab56b8…

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

UZr-98Che.tdb: ORTHORHOMBIC_A20, type code %, sha256 f8840e9375fb1dd8…

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

UZr-98Kur.tdb: ORTHORHOMBIC_A20, type code %, sha256 50af5e7e903bfaec…

44: PHASE ORTHORHOMBIC_A20 % 1 1 !
45: CONST ORTHORHOMBIC_A20 : U% ZR : !

Example references (10 of 10; assessments first):

doi:10.1016/j.jnucmat.2013.07.034 Wei Xiong, Wei Xie, Chao Shen, Dane Morgan, Thermodynamic modeling of the U–Zr system – A revisit, Journal of Nuclear Materials 443, 331-341 (2013).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2004.03.005 Pierre-Yves Chevalier, Evelyne Fischer, Bertrand Cheynet, Progress in the thermodynamic modelling of the O–U–Zr ternary system, Calphad 28, 15-40 (2004).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.commatsci.2017.11.042 Wei Xie, Dane Morgan, CALPHAD modeling and ab initio calculations of the Np-U-Zr system, Computational Materials Science 143, 505-514 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2018.01.023 A. Quaini, C. Guéneau, S. Gossé, N. Dupin, B. Sundman, E. Brackx et al., Contribution to the thermodynamic description of the corium – The U-Zr-O system, Journal of Nuclear Materials 501, 104-131 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2024.155378 W.J. Williams, J. Lund, R.E. García, M.A. Okuniewski, A modern reappraisal of the U-Zr phase diagram, Journal of Nuclear Materials 603, 155378 (2025).
assessment that models this phase
doi:10.1016/S0022-3115(98)00450-4 P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998).
assessment that models this phase
doi:10.1016/S0925-8388(98)00176-5 M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998).
assessment that models this phase
doi:10.1007/bf02881432 R. I. Sheldon, D. E. Peterson, The U-Zr (Uranium-Zirconium) system, Bulletin of Alloy Phase Diagrams 10, 165-171 (1989).
cited as the source of values for this phase
doi:10.2172/4351828 F.A. Rough, A.E. Austin, A.A. Bauer, J.R. Doig, THE STABILITY AND EXISTENCE RANGE OF THE ZIRCONIUM-URANIUM EPSILON PHASE, (1956).
cited as the source of values for this phase
doi:10.2172/4783490 S T Zegler, THE URANIUM-RICH END OF THE URANIUM-ZIRCONIUM SYSTEM. Final Report- Metallurgy Program 3.1.3., (1962).
cited as the source of values for this phase

BCC_A2 (U–Zr)

Id: phase:u-zr: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 9 of 9 calculated diagram(s): 872.18–3999.6 K, x(Zr) 0–1
Literature: 46 values (46 accepted) from 2 papers
Interactive: phase registry entry

Names (12): corpus: corpus:phase:u-zr:bcc-a2
paper: paper:10.1016/j.jnucmat.2013.07.034:γ, paper:10.1016/s0022-3115(98)00450-4:bcc_A2
tdb: tdb:UZr-04Che-LB.tdb:BCC_A2, tdb:UZr-10Kur.tdb:BCC_A2, tdb:UZr-13Xio.tdb:BCC_A2, tdb:UZr-18Qua.tdb:BCC_A2, tdb:UZr-18Xie.tdb:BCC_A2, tdb:UZr-25Wil.tdb:BCC_A2, tdb:UZr-98AEA.tdb:BCC_A2, tdb:UZr-98Che.tdb:BCC_A2, tdb:UZr-98Kur.tdb:BCC_A2

TDB models of BCC_A2 (9): PHASE and CONSTITUENT statements as written

UZr-04Che-LB.tdb: BCC_A2, type code %B, sha256 6481e0aab32c5025…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : U% ZR% : VA : !

UZr-10Kur.tdb: BCC_A2, type code %B, sha256 ffe4a27268b05f08…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : U% ZR% : VA : !

UZr-13Xio.tdb: BCC_A2, type code %B, sha256 eafa259a3af659a1…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : U% ZR% : VA : !

UZr-18Qua.tdb: BCC_A2, type code %B, sha256 03a5d10eb8a85d30…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : U% ZR% : VA : !

UZr-18Xie.tdb: BCC_A2, type code %B, sha256 7469615c052eb943…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : U% ZR% : VA : !

UZr-25Wil.tdb: BCC_A2, type code %B, sha256 82222cb1e3065b7a…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : U% ZR% : VA : !

UZr-98AEA.tdb: BCC_A2, type code %B, sha256 bcf26f6ed9ab56b8…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : U% ZR% : VA : !

UZr-98Che.tdb: BCC_A2, type code %B, sha256 f8840e9375fb1dd8…

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

UZr-98Kur.tdb: BCC_A2, type code %B, sha256 50af5e7e903bfaec…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : U% ZR% : VA : !

Example references (10 of 10; assessments first):

doi:10.1016/j.jnucmat.2013.07.034 Wei Xiong, Wei Xie, Chao Shen, Dane Morgan, Thermodynamic modeling of the U–Zr system – A revisit, Journal of Nuclear Materials 443, 331-341 (2013).
assessment that models this phase; reports values for this phase
doi:10.1016/S0022-3115(98)00450-4 P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2004.03.005 Pierre-Yves Chevalier, Evelyne Fischer, Bertrand Cheynet, Progress in the thermodynamic modelling of the O–U–Zr ternary system, Calphad 28, 15-40 (2004).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.commatsci.2017.11.042 Wei Xie, Dane Morgan, CALPHAD modeling and ab initio calculations of the Np-U-Zr system, Computational Materials Science 143, 505-514 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2018.01.023 A. Quaini, C. Guéneau, S. Gossé, N. Dupin, B. Sundman, E. Brackx et al., Contribution to the thermodynamic description of the corium – The U-Zr-O system, Journal of Nuclear Materials 501, 104-131 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2024.155378 W.J. Williams, J. Lund, R.E. García, M.A. Okuniewski, A modern reappraisal of the U-Zr phase diagram, Journal of Nuclear Materials 603, 155378 (2025).
assessment that models this phase
doi:10.1016/S0925-8388(98)00176-5 M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998).
assessment that models this phase
doi:10.1007/bf02881432 R. I. Sheldon, D. E. Peterson, The U-Zr (Uranium-Zirconium) system, Bulletin of Alloy Phase Diagrams 10, 165-171 (1989).
cited as the source of values for this phase
doi:10.2172/4351828 F.A. Rough, A.E. Austin, A.A. Bauer, J.R. Doig, THE STABILITY AND EXISTENCE RANGE OF THE ZIRCONIUM-URANIUM EPSILON PHASE, (1956).
cited as the source of values for this phase
doi:10.2172/4783490 S T Zegler, THE URANIUM-RICH END OF THE URANIUM-ZIRCONIUM SYSTEM. Final Report- Metallurgy Program 3.1.3., (1962).
cited as the source of values for this phase

FCC_A1 (U–Zr)

Id: phase:u-zr: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 9 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:u-zr:fcc-a1
tdb: tdb:UZr-04Che-LB.tdb:FCC_A1, tdb:UZr-10Kur.tdb:FCC_A1, tdb:UZr-13Xio.tdb:FCC_A1, tdb:UZr-18Qua.tdb:FCC_A1, tdb:UZr-18Xie.tdb:FCC_A1, tdb:UZr-25Wil.tdb:FCC_A1, tdb:UZr-98AEA.tdb:FCC_A1, tdb:UZr-98Che.tdb:FCC_A1, tdb:UZr-98Kur.tdb:FCC_A1

TDB models of FCC_A1 (9): PHASE and CONSTITUENT statements as written

UZr-04Che-LB.tdb: FCC_A1, type code %A, sha256 6481e0aab32c5025…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : U ZR : VA : !

UZr-10Kur.tdb: FCC_A1, type code %A, sha256 ffe4a27268b05f08…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : U ZR : VA : !

UZr-13Xio.tdb: FCC_A1, type code %A, sha256 eafa259a3af659a1…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : U ZR : VA : !

UZr-18Qua.tdb: FCC_A1, type code %A, sha256 03a5d10eb8a85d30…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : U ZR : VA : !

UZr-18Xie.tdb: FCC_A1, type code %A, sha256 7469615c052eb943…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : U ZR : VA : !

UZr-25Wil.tdb: FCC_A1, type code %A, sha256 82222cb1e3065b7a…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : U ZR : VA : !

UZr-98AEA.tdb: FCC_A1, type code %A, sha256 bcf26f6ed9ab56b8…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : U ZR : VA : !

UZr-98Che.tdb: FCC_A1, type code %A, sha256 f8840e9375fb1dd8…

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

UZr-98Kur.tdb: FCC_A1, type code %A, sha256 50af5e7e903bfaec…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : U ZR : VA : !

Example references (7 of 7; assessments first):

doi:10.1016/j.calphad.2004.03.005 Pierre-Yves Chevalier, Evelyne Fischer, Bertrand Cheynet, Progress in the thermodynamic modelling of the O–U–Zr ternary system, Calphad 28, 15-40 (2004).
assessment that models this phase
doi:10.1016/j.commatsci.2017.11.042 Wei Xie, Dane Morgan, CALPHAD modeling and ab initio calculations of the Np-U-Zr system, Computational Materials Science 143, 505-514 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2013.07.034 Wei Xiong, Wei Xie, Chao Shen, Dane Morgan, Thermodynamic modeling of the U–Zr system – A revisit, Journal of Nuclear Materials 443, 331-341 (2013).
assessment that models this phase
doi:10.1016/j.jnucmat.2018.01.023 A. Quaini, C. Guéneau, S. Gossé, N. Dupin, B. Sundman, E. Brackx et al., Contribution to the thermodynamic description of the corium – The U-Zr-O system, Journal of Nuclear Materials 501, 104-131 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2024.155378 W.J. Williams, J. Lund, R.E. García, M.A. Okuniewski, A modern reappraisal of the U-Zr phase diagram, Journal of Nuclear Materials 603, 155378 (2025).
assessment that models this phase
doi:10.1016/S0022-3115(98)00450-4 P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998).
assessment that models this phase
doi:10.1016/S0925-8388(98)00176-5 M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998).
assessment that models this phase

HCP_A3 (U–Zr)

Id: phase:u-zr: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 9 of 9 calculated diagram(s): 300–2123.99 K, x(Zr) 0.98173–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (11): corpus: corpus:phase:u-zr:hcp-a3
paper: paper:10.1016/j.jnucmat.2013.07.034:α(Zr)
tdb: tdb:UZr-04Che-LB.tdb:HCP_A3, tdb:UZr-10Kur.tdb:HCP_A3, tdb:UZr-13Xio.tdb:HCP_A3, tdb:UZr-18Qua.tdb:HCP_A3, tdb:UZr-18Xie.tdb:HCP_A3, tdb:UZr-25Wil.tdb:HCP_A3, tdb:UZr-98AEA.tdb:HCP_A3, tdb:UZr-98Che.tdb:HCP_A3, tdb:UZr-98Kur.tdb:HCP_A3

TDB models of HCP_A3 (9): PHASE and CONSTITUENT statements as written

UZr-04Che-LB.tdb: HCP_A3, type code %A, sha256 6481e0aab32c5025…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : U ZR% : VA : !

UZr-10Kur.tdb: HCP_A3, type code %A, sha256 ffe4a27268b05f08…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : U ZR% : VA : !

UZr-13Xio.tdb: HCP_A3, type code %A, sha256 eafa259a3af659a1…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : U ZR% : VA : !

UZr-18Qua.tdb: HCP_A3, type code %A, sha256 03a5d10eb8a85d30…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : U ZR% : VA : !

UZr-18Xie.tdb: HCP_A3, type code %A, sha256 7469615c052eb943…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : U ZR% : VA : !

UZr-25Wil.tdb: HCP_A3, type code %A, sha256 82222cb1e3065b7a…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : U ZR% : VA : !

UZr-98AEA.tdb: HCP_A3, type code %A, sha256 bcf26f6ed9ab56b8…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : U ZR% : VA : !

UZr-98Che.tdb: HCP_A3, type code %A, sha256 f8840e9375fb1dd8…

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

UZr-98Kur.tdb: HCP_A3, type code %A, sha256 50af5e7e903bfaec…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : U ZR% : VA : !

Example references (9 of 9; assessments first):

doi:10.1016/j.jnucmat.2013.07.034 Wei Xiong, Wei Xie, Chao Shen, Dane Morgan, Thermodynamic modeling of the U–Zr system – A revisit, Journal of Nuclear Materials 443, 331-341 (2013).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2004.03.005 Pierre-Yves Chevalier, Evelyne Fischer, Bertrand Cheynet, Progress in the thermodynamic modelling of the O–U–Zr ternary system, Calphad 28, 15-40 (2004).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.commatsci.2017.11.042 Wei Xie, Dane Morgan, CALPHAD modeling and ab initio calculations of the Np-U-Zr system, Computational Materials Science 143, 505-514 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2018.01.023 A. Quaini, C. Guéneau, S. Gossé, N. Dupin, B. Sundman, E. Brackx et al., Contribution to the thermodynamic description of the corium – The U-Zr-O system, Journal of Nuclear Materials 501, 104-131 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2024.155378 W.J. Williams, J. Lund, R.E. García, M.A. Okuniewski, A modern reappraisal of the U-Zr phase diagram, Journal of Nuclear Materials 603, 155378 (2025).
assessment that models this phase
doi:10.1016/S0022-3115(98)00450-4 P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998).
assessment that models this phase
doi:10.1016/S0925-8388(98)00176-5 M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998).
assessment that models this phase
doi:10.1007/bf02881432 R. I. Sheldon, D. E. Peterson, The U-Zr (Uranium-Zirconium) system, Bulletin of Alloy Phase Diagrams 10, 165-171 (1989).
cited as the source of values for this phase
doi:10.2172/4351828 F.A. Rough, A.E. Austin, A.A. Bauer, J.R. Doig, THE STABILITY AND EXISTENCE RANGE OF THE ZIRCONIUM-URANIUM EPSILON PHASE, (1956).
cited as the source of values for this phase

LIQUID (U–Zr)

Id: phase:u-zr:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 9 of 9 calculated diagram(s): 1320.49–4000 K, x(Zr) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:u-zr:liquid
tdb: tdb:UZr-04Che-LB.tdb:LIQUID, tdb:UZr-10Kur.tdb:LIQUID, tdb:UZr-13Xio.tdb:LIQUID, tdb:UZr-18Qua.tdb:LIQUID, tdb:UZr-18Xie.tdb:LIQUID, tdb:UZr-25Wil.tdb:LIQUID, tdb:UZr-98AEA.tdb:LIQUID, tdb:UZr-98Che.tdb:LIQUID, tdb:UZr-98Kur.tdb:LIQUID

TDB models of LIQUID (9): PHASE and CONSTITUENT statements as written

UZr-04Che-LB.tdb: LIQUID, type code %, sha256 6481e0aab32c5025…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : U ZR : !

UZr-10Kur.tdb: LIQUID, type code %, sha256 ffe4a27268b05f08…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : U ZR : !

UZr-13Xio.tdb: LIQUID, type code %, sha256 eafa259a3af659a1…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : U ZR : !

UZr-18Qua.tdb: LIQUID, type code %, sha256 03a5d10eb8a85d30…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : U ZR : !

UZr-18Xie.tdb: LIQUID, type code %, sha256 7469615c052eb943…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : U ZR : !

UZr-25Wil.tdb: LIQUID, type code %, sha256 82222cb1e3065b7a…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : U ZR : !

UZr-98AEA.tdb: LIQUID, type code %, sha256 bcf26f6ed9ab56b8…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : U ZR : !

UZr-98Che.tdb: LIQUID, type code %, sha256 f8840e9375fb1dd8…

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

UZr-98Kur.tdb: LIQUID, type code %, sha256 50af5e7e903bfaec…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : U ZR : !

Example references (7 of 7; assessments first):

doi:10.1016/j.calphad.2004.03.005 Pierre-Yves Chevalier, Evelyne Fischer, Bertrand Cheynet, Progress in the thermodynamic modelling of the O–U–Zr ternary system, Calphad 28, 15-40 (2004).
assessment that models this phase
doi:10.1016/j.commatsci.2017.11.042 Wei Xie, Dane Morgan, CALPHAD modeling and ab initio calculations of the Np-U-Zr system, Computational Materials Science 143, 505-514 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2013.07.034 Wei Xiong, Wei Xie, Chao Shen, Dane Morgan, Thermodynamic modeling of the U–Zr system – A revisit, Journal of Nuclear Materials 443, 331-341 (2013).
assessment that models this phase
doi:10.1016/j.jnucmat.2018.01.023 A. Quaini, C. Guéneau, S. Gossé, N. Dupin, B. Sundman, E. Brackx et al., Contribution to the thermodynamic description of the corium – The U-Zr-O system, Journal of Nuclear Materials 501, 104-131 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2024.155378 W.J. Williams, J. Lund, R.E. García, M.A. Okuniewski, A modern reappraisal of the U-Zr phase diagram, Journal of Nuclear Materials 603, 155378 (2025).
assessment that models this phase
doi:10.1016/S0022-3115(98)00450-4 P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998).
assessment that models this phase
doi:10.1016/S0925-8388(98)00176-5 M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998).
assessment that models this phase

TETRAGONAL_U (U–Zr)

Id: phase:u-zr: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 — UZr-04Che-LB.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — UZr-10Kur.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — UZr-13Xio.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — UZr-18Qua.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — UZr-18Xie.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — UZr-25Wil.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — UZr-98AEA.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Stability: stable in 9 of 9 calculated diagram(s): 933–1131.44 K, x(Zr) 0–0.01971
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (12): corpus: corpus:phase:u-zr:u-tetragonal, corpus:phase:u-zr:tetragonal-u
paper: paper:10.1016/j.jnucmat.2013.07.034:β(U)
tdb: tdb:UZr-04Che-LB.tdb:TETRAGONAL_U, tdb:UZr-10Kur.tdb:TETRAGONAL_U, tdb:UZr-13Xio.tdb:TETRAGONAL_U, tdb:UZr-18Qua.tdb:TETRAGONAL_U, tdb:UZr-18Xie.tdb:TETRAGONAL_U, tdb:UZr-25Wil.tdb:TETRAGONAL_U, tdb:UZr-98AEA.tdb:TETRAGONAL_U, tdb:UZr-98Che.tdb:TETRAGONAL_U, tdb:UZr-98Kur.tdb:TETRAGONAL_U

TDB models of TETRAGONAL_U (9): PHASE and CONSTITUENT statements as written

UZr-04Che-LB.tdb: TETRAGONAL_U, type code %, sha256 6481e0aab32c5025…

45: PHASE TETRAGONAL_U % 1 1 !
46: CONST TETRAGONAL_U : U% ZR : !

UZr-10Kur.tdb: TETRAGONAL_U, type code %, sha256 ffe4a27268b05f08…

45: PHASE TETRAGONAL_U % 1 1 !
46: CONST TETRAGONAL_U : U% ZR : !

UZr-13Xio.tdb: TETRAGONAL_U, type code %, sha256 eafa259a3af659a1…

45: PHASE TETRAGONAL_U % 1 1 !
46: CONST TETRAGONAL_U : U% ZR : !

UZr-18Qua.tdb: TETRAGONAL_U, type code %, sha256 03a5d10eb8a85d30…

48: PHASE TETRAGONAL_U % 1 1 !
49: CONST TETRAGONAL_U : U% ZR : !

UZr-18Xie.tdb: TETRAGONAL_U, type code %, sha256 7469615c052eb943…

49: PHASE TETRAGONAL_U % 1 1 !
50: CONST TETRAGONAL_U : U% ZR : !

UZr-25Wil.tdb: TETRAGONAL_U, type code %, sha256 82222cb1e3065b7a…

50: PHASE TETRAGONAL_U % 1 1 !
51: CONST TETRAGONAL_U : U% ZR : !

UZr-98AEA.tdb: TETRAGONAL_U, type code %, sha256 bcf26f6ed9ab56b8…

48: PHASE TETRAGONAL_U % 1 1 !
49: CONST TETRAGONAL_U : U : !

UZr-98Che.tdb: TETRAGONAL_U, type code %, sha256 f8840e9375fb1dd8…

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

UZr-98Kur.tdb: TETRAGONAL_U, type code %, sha256 50af5e7e903bfaec…

49: PHASE TETRAGONAL_U % 1 1 !
50: CONST TETRAGONAL_U : U% ZR : !

Example references (9 of 9; assessments first):

doi:10.1016/j.jnucmat.2013.07.034 Wei Xiong, Wei Xie, Chao Shen, Dane Morgan, Thermodynamic modeling of the U–Zr system – A revisit, Journal of Nuclear Materials 443, 331-341 (2013).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2004.03.005 Pierre-Yves Chevalier, Evelyne Fischer, Bertrand Cheynet, Progress in the thermodynamic modelling of the O–U–Zr ternary system, Calphad 28, 15-40 (2004).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.commatsci.2017.11.042 Wei Xie, Dane Morgan, CALPHAD modeling and ab initio calculations of the Np-U-Zr system, Computational Materials Science 143, 505-514 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2018.01.023 A. Quaini, C. Guéneau, S. Gossé, N. Dupin, B. Sundman, E. Brackx et al., Contribution to the thermodynamic description of the corium – The U-Zr-O system, Journal of Nuclear Materials 501, 104-131 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2024.155378 W.J. Williams, J. Lund, R.E. García, M.A. Okuniewski, A modern reappraisal of the U-Zr phase diagram, Journal of Nuclear Materials 603, 155378 (2025).
assessment that models this phase
doi:10.1016/S0022-3115(98)00450-4 P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998).
assessment that models this phase
doi:10.1016/S0925-8388(98)00176-5 M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998).
assessment that models this phase
doi:10.1007/bf02881432 R. I. Sheldon, D. E. Peterson, The U-Zr (Uranium-Zirconium) system, Bulletin of Alloy Phase Diagrams 10, 165-171 (1989).
cited as the source of values for this phase
doi:10.2172/4783490 S T Zegler, THE URANIUM-RICH END OF THE URANIUM-ZIRCONIUM SYSTEM. Final Report- Metallurgy Program 3.1.3., (1962).
cited as the source of values for this phase

U3ZR7 (U–Zr)

Id: phase:u-zr:u3zr7; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token
Candidate (tdb_comment): Hg2U · hP3 · P6/mmm — UZr-98Che.tdb: 'Prototype Hg2U (hP3, P6/mmm)'
Stoichiometry: U 0.3000, Zr 0.7000
Stability: stable in 1 of 1 calculated diagram(s): 300–880.85 K, x(Zr) 0.7–0.7
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:u-zr:u3zr7
tdb: tdb:UZr-98Che.tdb:U3ZR7

TDB models of U3ZR7 (1): PHASE and CONSTITUENT statements as written

UZr-98Che.tdb: U3ZR7, type code %, sha256 f8840e9375fb1dd8…

52: PHASE U3ZR7 % 2 3 7 !
53: CONST U3ZR7 : U : ZR : !

Example references (1 of 1; assessments first):

doi:10.1016/S0022-3115(98)00450-4 P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998).
assessment that models this phase

UZR2_DELTA (U–Zr)

Id: phase:u-zr:uzr2-delta; status assigned
Structure: Hg2U · hP3 · P6/mmm (191); type st:hg2u-hp3; 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_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 8 of 8 calculated diagram(s): 300–893.38 K, x(Zr) 0.59543–0.89214
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:u-zr:uzr2-delta
paper: paper:10.1016/j.jnucmat.2013.07.034:δ
tdb: tdb:UZr-04Che-LB.tdb:UZR2_DELTA, tdb:UZr-10Kur.tdb:UZR2_DELTA, tdb:UZr-13Xio.tdb:UZR2_DELTA, tdb:UZr-18Qua.tdb:UZR2_DELTA, tdb:UZr-18Xie.tdb:UZR2_DELTA, tdb:UZr-25Wil.tdb:UZR2_DELTA, tdb:UZr-98AEA.tdb:UZR2_DELTA, tdb:UZr-98Kur.tdb:UZR2_DELTA

TDB models of UZR2_DELTA (8): PHASE and CONSTITUENT statements as written

UZr-04Che-LB.tdb: UZR2_DELTA, type code %, sha256 6481e0aab32c5025…

50: PHASE UZR2_DELTA % 2 2 1 !
51: CONST UZR2_DELTA : U ZR : ZR : !

UZr-10Kur.tdb: UZR2_DELTA, type code %, sha256 ffe4a27268b05f08…

51: PHASE UZR2_DELTA % 2 1 2 !
52: CONST UZR2_DELTA : U% ZR : U ZR% : !

UZr-13Xio.tdb: UZR2_DELTA, type code %, sha256 eafa259a3af659a1…

51: PHASE UZR2_DELTA % 2 1 2 !
52: CONST UZR2_DELTA : ZR : U ZR : !

UZr-18Qua.tdb: UZR2_DELTA, type code %, sha256 03a5d10eb8a85d30…

54: PHASE UZR2_DELTA % 2 1 2 !
55: CONST UZR2_DELTA : ZR : U ZR : !

UZr-18Xie.tdb: UZR2_DELTA, type code %, sha256 7469615c052eb943…

55: PHASE UZR2_DELTA % 2 1 2 !
56: CONST UZR2_DELTA : ZR : U ZR : !

UZr-25Wil.tdb: UZR2_DELTA, type code %, sha256 82222cb1e3065b7a…

56: PHASE UZR2_DELTA % 2 1 2 !
57: CONST UZR2_DELTA : ZR : U ZR : !

UZr-98AEA.tdb: UZR2_DELTA, type code %, sha256 bcf26f6ed9ab56b8…

53: PHASE UZR2_DELTA % 1 1 !
54: CONST UZR2_DELTA : U ZR : !

UZr-98Kur.tdb: UZR2_DELTA, type code %, sha256 50af5e7e903bfaec…

54: PHASE UZR2_DELTA % 2 1 2 !
55: CONST UZR2_DELTA : U% ZR : U ZR% : !

Example references (8 of 8; assessments first):

doi:10.1016/j.jnucmat.2013.07.034 Wei Xiong, Wei Xie, Chao Shen, Dane Morgan, Thermodynamic modeling of the U–Zr system – A revisit, Journal of Nuclear Materials 443, 331-341 (2013).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2004.03.005 Pierre-Yves Chevalier, Evelyne Fischer, Bertrand Cheynet, Progress in the thermodynamic modelling of the O–U–Zr ternary system, Calphad 28, 15-40 (2004).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/j.commatsci.2017.11.042 Wei Xie, Dane Morgan, CALPHAD modeling and ab initio calculations of the Np-U-Zr system, Computational Materials Science 143, 505-514 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2018.01.023 A. Quaini, C. Guéneau, S. Gossé, N. Dupin, B. Sundman, E. Brackx et al., Contribution to the thermodynamic description of the corium – The U-Zr-O system, Journal of Nuclear Materials 501, 104-131 (2018).
assessment that models this phase
doi:10.1016/j.jnucmat.2024.155378 W.J. Williams, J. Lund, R.E. García, M.A. Okuniewski, A modern reappraisal of the U-Zr phase diagram, Journal of Nuclear Materials 603, 155378 (2025).
assessment that models this phase
doi:10.1016/S0925-8388(98)00176-5 M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998).
assessment that models this phase
doi:10.1007/bf02881432 R. I. Sheldon, D. E. Peterson, The U-Zr (Uranium-Zirconium) system, Bulletin of Alloy Phase Diagrams 10, 165-171 (1989).
cited as the source of values for this phase
doi:10.2172/4351828 F.A. Rough, A.E. Austin, A.A. Bauer, J.R. Doig, THE STABILITY AND EXISTENCE RANGE OF THE ZIRCONIUM-URANIUM EPSILON PHASE, (1956).
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}
}