# U–Zr system

> U–Zr system: 66 accepted literature values (invariant reaction 30, activity / EMF / Gibbs energy 20, phase transition 16) and 9 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/U-ZR.html · Markdown: https://data.orchid-project.org/systems/U-ZR.md

66 accepted literature values from 2 paper(s) (experimental 46, model 20); 9 calculated phase diagram(s). 12 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/U-ZR.json) · [CSV](https://data.orchid-project.org/systems/U-ZR.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#U-ZR) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-04Che-LB.json) · [phases (8)](https://data.orchid-project.org/phases/pages/U-ZR.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/U-ZR.html) · [Markdown](https://data.orchid-project.org/systems/U-ZR.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 46 |
| model | 20 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 30 |
| phase transition | 16 |
| activity / EMF / Gibbs energy | 20 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| UZr-04Che-LB.tdb | P.-Y. Chevalier, E. Fischer, B. Cheynet, Calphad, 28, 15-40(2004). [doi:10.1016/j.calphad.2004.03.005](https://doi.org/10.1016/j.calphad.2004.03.005) | `6481e0aab32c502553eec19fcbdb8d8df901d380f73dd5b6114027da6a71f311` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-04Che-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-04Che-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-04Che-LB.json) |
| UZr-10Kur.tdb | M. Kurata, IOP Conf. Ser.: Mater. Sci. Eng., 9, 012022(2010). | `ffe4a27268b05f0884c247e73ce1d396826440856b5ce0091416fb94c489446a` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-10Kur.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-10Kur.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-10Kur.json) |
| UZr-13Xio.tdb | W. Xiong, W. Xie, C. Shen, D. Morgan, J. Nuclear Mater., 443, 331-41(2013). [doi:10.1016/j.jnucmat.2013.07.034](https://doi.org/10.1016/j.jnucmat.2013.07.034) | `eafa259a3af659a1670bc5131aa91abddb149212bbca65466ed9587554f684aa` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-13Xio.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-13Xio.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-13Xio.json) |
| UZr-18Qua.tdb | A. Quaini, C. Gueneau, S. Gosse, N. Dupin, B. Sundman, E. Brackx R. Domenger, M. Kurata, F. Hodaj, J. Nuclear Mater., 501, 104-31(2018). [doi:10.1016/j.jnucmat.2018.01.023](https://doi.org/10.1016/j.jnucmat.2018.01.023) | `03a5d10eb8a85d302f4d569f32fc5bcadc8a11dd99177506228d1724e55a18cc` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-18Qua.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-18Qua.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-18Qua.json) |
| UZr-18Xie.tdb | W. Xie, D. Morgan, Comput. Mater. Sci., 143, 505-14(2018). [doi:10.1016/j.commatsci.2017.11.042](https://doi.org/10.1016/j.commatsci.2017.11.042) | `7469615c052eb9435d2951c01b509f0f4770b39295e10b70605ecba96f883e81` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-18Xie.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-18Xie.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-18Xie.json) |
| UZr-25Wil.tdb | W.J. Williams, J. Lund, R.E. Garcia, M.A. Okuniewski, J. Nucl. Mater., 603, 155378(2025). [doi:10.1016/j.jnucmat.2024.155378](https://doi.org/10.1016/j.jnucmat.2024.155378) | `82222cb1e3065b7a62218733f8869b152ceeccb5bb5b05f1ab7eb4c2d684dd96` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-25Wil.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-25Wil.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-25Wil.json) |
| UZr-98AEA.tdb | AEA Harwell, unpublished, 1998. | `bcf26f6ed9ab56b8f6e7002b90ea7fa8b80e0605367144fa22a77a495b2ef44c` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-98AEA.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-98AEA.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-98AEA.json) |
| UZr-98Che.tdb | P.-Y. Chevalier, E. Fischer, J. Nucl. Mater., 257, 213-55(1998). [doi:10.1016/S0022-3115(98)00450-4](https://doi.org/10.1016/S0022-3115%2898%2900450-4) | `f8840e9375fb1dd81b0b5ff7dd16d781d9d2f4e547f3185dcd3b2e1cfb28ebf9` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-98Che.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-98Che.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-98Che.json) |
| UZr-98Kur.tdb | M. Kurata, T. Ogata, K. Nakamura, T. Ogawa, J. Alloys Compd., 271-273, 636-40(1998). [doi:10.1016/S0925-8388(98)00176-5](https://doi.org/10.1016/S0925-8388%2898%2900176-5) | `50af5e7e903bfaece1b5c166f9b4f36b4ea447b8f2c5a579177d5106f13a57f6` | [viewer](https://orchid-project.org/phase-diagrams/#U-ZR/UZr-98Kur.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/UZr-98Kur.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/UZr-98Kur.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| UZr-04Che-LB.tdb | 965.48 | TETRAGONAL_U (x(Zr) 0.01016) + BCC_A2 (x(Zr) 0.17159) + BCC_A2#2 (x(Zr) 0.44603) |
| UZr-04Che-LB.tdb | 934.23 | ORTHORHOMBIC_A20 (x(Zr) 0.00703) + TETRAGONAL_U (x(Zr) 0.00998) + BCC_A2 (x(Zr) 0.55433) |
| UZr-04Che-LB.tdb | 888.4 | ORTHORHOMBIC_A20 (x(Zr) 0.00659) + BCC_A2 (x(Zr) 0.63973) + UZR2_DELTA (x(Zr) 0.64144) |
| UZr-04Che-LB.tdb | 882.86 | UZR2_DELTA (x(Zr) 0.78341) + BCC_A2 (x(Zr) 0.80102) + HCP_A3 (x(Zr) 0.99532) |
| UZr-10Kur.tdb | 967.73 | TETRAGONAL_U (x(Zr) 0.01871) + BCC_A2 (x(Zr) 0.1146) + BCC_A2#2 (x(Zr) 0.47965) |
| UZr-10Kur.tdb | 936.97 | ORTHORHOMBIC_A20 (x(Zr) 0.01709) + TETRAGONAL_U (x(Zr) 0.01919) + BCC_A2 (x(Zr) 0.62558) |
| UZr-10Kur.tdb | 887.82 | ORTHORHOMBIC_A20 (x(Zr) 0.01643) + UZR2_DELTA (x(Zr) 0.63474) + BCC_A2 (x(Zr) 0.77864) |
| UZr-10Kur.tdb | 883.54 | UZR2_DELTA (x(Zr) 0.752) + BCC_A2 (x(Zr) 0.81433) + HCP_A3 (x(Zr) 0.98173) |
| UZr-13Xio.tdb | 963.74 | TETRAGONAL_U (x(Zr) 0.01171) + BCC_A2 (x(Zr) 0.1124) + BCC_A2#2 (x(Zr) 0.44034) |
| UZr-13Xio.tdb | 934.7 | ORTHORHOMBIC_A20 (x(Zr) 0.00797) + TETRAGONAL_U (x(Zr) 0.01093) + BCC_A2 (x(Zr) 0.56358) |
| UZr-13Xio.tdb | 891.85 | ORTHORHOMBIC_A20 (x(Zr) 0.00685) + UZR2_DELTA (x(Zr) 0.63657) + BCC_A2 (x(Zr) 0.67584) |
| UZr-13Xio.tdb | 876.7 | UZR2_DELTA (x(Zr) 0.77223) + BCC_A2 (x(Zr) 0.81241) + HCP_A3 (x(Zr) 0.98718) |
| UZr-18Qua.tdb | 965.95 | TETRAGONAL_U (x(Zr) 0.01789) + BCC_A2 (x(Zr) 0.12686) + BCC_A2#2 (x(Zr) 0.41517) |
| UZr-18Qua.tdb | 935.97 | ORTHORHOMBIC_A20 (x(Zr) 0.01405) + TETRAGONAL_U (x(Zr) 0.01756) + BCC_A2 (x(Zr) 0.53892) |
| UZr-18Qua.tdb | 890.68 | ORTHORHOMBIC_A20 (x(Zr) 0.0132) + UZR2_DELTA (x(Zr) 0.6414) + BCC_A2 (x(Zr) 0.66954) |
| UZr-18Qua.tdb | 881.2 | UZR2_DELTA (x(Zr) 0.78762) + BCC_A2 (x(Zr) 0.80683) + HCP_A3 (x(Zr) 0.99034) |
| UZr-18Xie.tdb | 963.74 | TETRAGONAL_U (x(Zr) 0.01171) + BCC_A2 (x(Zr) 0.1124) + BCC_A2#2 (x(Zr) 0.44034) |
| UZr-18Xie.tdb | 934.7 | ORTHORHOMBIC_A20 (x(Zr) 0.00797) + TETRAGONAL_U (x(Zr) 0.01093) + BCC_A2 (x(Zr) 0.56358) |
| UZr-18Xie.tdb | 893.38 | ORTHORHOMBIC_A20 (x(Zr) 0.00689) + UZR2_DELTA (x(Zr) 0.63621) + BCC_A2 (x(Zr) 0.67271) |
| UZr-18Xie.tdb | 877.28 | UZR2_DELTA (x(Zr) 0.79303) + BCC_A2 (x(Zr) 0.81295) + HCP_A3 (x(Zr) 0.98719) |
| UZr-25Wil.tdb | 964.93 | TETRAGONAL_U (x(Zr) 0.00552) + ORTHORHOMBIC_A20 (x(Zr) 0.01422) + BCC_A2 (x(Zr) 0.07924) |
| UZr-25Wil.tdb | 955.45 | ORTHORHOMBIC_A20 (x(Zr) 0.01623) + BCC_A2#2 (x(Zr) 0.12017) + BCC_A2 (x(Zr) 0.47164) |
| UZr-25Wil.tdb | 883.82 | ORTHORHOMBIC_A20 (x(Zr) 0.0133) + UZR2_DELTA (x(Zr) 0.64887) + BCC_A2 (x(Zr) 0.69696) |
| UZr-25Wil.tdb | 877.42 | BCC_A2 (x(Zr) 0.82751) + UZR2_DELTA (x(Zr) 0.89189) + HCP_A3 (x(Zr) 0.9883) |
| UZr-25Wil.tdb | 568.87 | ORTHORHOMBIC_A20 (x(Zr) 8.800e-4) + UZR2_DELTA (x(Zr) 0.73327) + HCP_A3 (x(Zr) 0.9991) |
| UZr-98AEA.tdb | 954.31 | TETRAGONAL_U (x(Zr) 0) + BCC_A2 (x(Zr) 0.09881) + BCC_A2#2 (x(Zr) 0.4569) |
| UZr-98AEA.tdb | 942.02 | ORTHORHOMBIC_A20 (x(Zr) 0) + TETRAGONAL_U (x(Zr) 0) + BCC_A2 (x(Zr) 0.51422) |
| UZr-98AEA.tdb | 888.5 | ORTHORHOMBIC_A20 (x(Zr) 0) + UZR2_DELTA (x(Zr) 0.69475) + BCC_A2 (x(Zr) 0.70781) |
| UZr-98AEA.tdb | 888.5 | ORTHORHOMBIC_A20 (x(Zr) 0) + UZR2_DELTA (x(Zr) 0.69481) + BCC_A2 (x(Zr) 0.70794) |
| UZr-98AEA.tdb | 884.46 | UZR2_DELTA (x(Zr) 0.74287) + BCC_A2 (x(Zr) 0.79728) + HCP_A3 (x(Zr) 0.99957) |
| UZr-98AEA.tdb | 688.08 | ORTHORHOMBIC_A20 (x(Zr) 0) + UZR2_DELTA (x(Zr) 0.69236) + HCP_A3 (x(Zr) 0.99996) |
| UZr-98AEA.tdb | 688.08 | ORTHORHOMBIC_A20 (x(Zr) 0) + UZR2_DELTA (x(Zr) 0.69228) + HCP_A3 (x(Zr) 0.99996) |
| UZr-98AEA.tdb | 320.32 | ORTHORHOMBIC_A20 (x(Zr) 0) + UZR2_DELTA (x(Zr) 0.60638) + HCP_A3 (x(Zr) 1) |
| UZr-98AEA.tdb | 320.32 | ORTHORHOMBIC_A20 (x(Zr) 0) + UZR2_DELTA (x(Zr) 0.60645) + HCP_A3 (x(Zr) 1) |
| UZr-98AEA.tdb | 320.32 | ORTHORHOMBIC_A20 (x(Zr) 0) + UZR2_DELTA (x(Zr) 0.6064) + HCP_A3 (x(Zr) 1) |
| UZr-98Che.tdb | 968.62 | TETRAGONAL_U (x(Zr) 0.01971) + BCC_A2 (x(Zr) 0.17954) + BCC_A2#2 (x(Zr) 0.51707) |
| UZr-98Che.tdb | 933 | ORTHORHOMBIC_A20 (x(Zr) 0.015) + TETRAGONAL_U (x(Zr) 0.01842) + BCC_A2 (x(Zr) 0.61721) |
| UZr-98Che.tdb | 880.85 | ORTHORHOMBIC_A20 (x(Zr) 0.01319) + U3ZR7 (x(Zr) 0.7) + BCC_A2 (x(Zr) 0.71134) |
| UZr-98Che.tdb | 880.35 | U3ZR7 (x(Zr) 0.7) + BCC_A2 (x(Zr) 0.72859) + HCP_A3 (x(Zr) 0.99745) |
| UZr-98Che.tdb | 880.35 | U3ZR7 (x(Zr) 0.7) + BCC_A2 (x(Zr) 0.72891) + HCP_A3 (x(Zr) 0.99745) |
| UZr-98Kur.tdb | 962.14 | TETRAGONAL_U (x(Zr) 0.01584) + BCC_A2 (x(Zr) 0.12163) + BCC_A2#2 (x(Zr) 0.43845) |
| UZr-98Kur.tdb | 934.74 | ORTHORHOMBIC_A20 (x(Zr) 0.01294) + TETRAGONAL_U (x(Zr) 0.01593) + BCC_A2 (x(Zr) 0.56698) |
| UZr-98Kur.tdb | 890.13 | ORTHORHOMBIC_A20 (x(Zr) 0.01223) + UZR2_DELTA (x(Zr) 0.63811) + BCC_A2 (x(Zr) 0.70532) |
| UZr-98Kur.tdb | 879.37 | UZR2_DELTA (x(Zr) 0.79473) + BCC_A2 (x(Zr) 0.83628) + HCP_A3 (x(Zr) 0.98983) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/U/U-ZR.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/U/U-ZR.json) · [CALPHAD hull UZr-04Che-LB](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-04Che-LB.json) · [CALPHAD hull UZr-10Kur](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-10Kur.json) · [CALPHAD hull UZr-13Xio](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-13Xio.json) · [CALPHAD hull UZr-18Qua](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-18Qua.json) · [CALPHAD hull UZr-18Xie](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-18Xie.json) · [CALPHAD hull UZr-98AEA](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-98AEA.json) · [CALPHAD hull UZr-98Che](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-98Che.json) · [CALPHAD hull UZr-98Kur](https://data.orchid-project.org/hulls/calphad-sgte/U/U-ZR--UZr-98Kur.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the U–Zr system (30)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 967.7 | γ ↔ γ' + β(U) | γ: Zr 0.11; γ': Zr 0.48; β(U): Zr 0.019 | model | [1] Xiong 2013; _cites Kurata 2010_ | Table 1, p. 4, row 2; `ORC-OWNIWRCJ5A` |  |
| 966 | γ ↔ γ' + β(U) | γ: Zr 0.11; γ': Zr 0.424; β(U): Zr 0.0106 | experimental | [1] Xiong 2013; _cites Zegler 1962_ [doi](https://doi.org/10.2172/4783490) | Table 1, p. 4, row 7; `ORC-LHQXKHFG3C` |  |
| 966 | γ ↔ γ' + β(U) | γ: Zr 0.109; γ': Zr 0.424; β(U): Zr 0.011 | model | [1] Xiong 2013; _cites Sheldon 1989_ [doi](https://doi.org/10.1007/bf02881432) | Table 1, p. 4, row 4; `ORC-LOVNVK2WGT` |  |
| 966 | γ ↔ γ' + β(U) | γ: Zr 0.145; γ': Zr 0.57; β(U): Zr 0.025 | experimental | [1] Xiong 2013; _cites Summers-Smith 1955_ | Table 1, p. 4, row 6; `ORC-UGK3VDWAH3` |  |
| 965.5 | γ ↔ γ' + β(U) | γ: Zr 0.172; γ': Zr 0.446; β(U): Zr 0.01 | model | [1] Xiong 2013; _cites Chevalier 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.03.005) | Table 1, p. 4, row 1; `ORC-PI5YWBOU7Q` |  |
| 963.7 | γ ↔ γ' + β(U) | γ: Zr 0.112; γ': Zr 0.44; β(U): Zr 0.012 | model | [1] Xiong 2013 | Table 1, p. 4, row 3; `ORC-MUWRLZ24HU` |  |
| 961 | γ ↔ γ' + β(U) | γ: Zr 0.097; γ': Zr 0.47 | model | [1] Xiong 2013; _cites Baker 1992_ | Table 1, p. 4, row 5; `ORC-UWXQQQRCYB` |  |
| 937 | β(U) ↔ α(U) + γ | β(U): Zr 0.019; γ: Zr 0.626 | model | [1] Xiong 2013; _cites Kurata 2010_ | Table 1, p. 4, row 9; `ORC-66SK4AYPLV` |  |
| 935 | β(U) ↔ α(U) + γ | β(U): Zr 0.015; γ: Zr 0.61 | experimental | [1] Xiong 2013; _cites Summers-Smith 1955_ | Table 1, p. 4, row 13; `ORC-4UR25X6ZHL` |  |
| 935 | β(U) ↔ α(U) + γ | α(U): Zr 0.0055 | experimental | [1] Xiong 2013; _cites Zegler 1962_ [doi](https://doi.org/10.2172/4783490) | Table 1, p. 4, row 14; `ORC-GRSONWIGP5` |  |
| 935 | β(U) ↔ α(U) + γ | β(U): Zr 0.008; γ: Zr 0.6 | model | [1] Xiong 2013; _cites Sheldon 1989_ [doi](https://doi.org/10.1007/bf02881432) | Table 1, p. 4, row 11; `ORC-QZ6NS2RLXN` |  |
| 934.7 | β(U) ↔ α(U) + γ | β(U): Zr 0.011; γ: Zr 0.563 | model | [1] Xiong 2013 | Table 1, p. 4, row 10; `ORC-GZTRLQK3T5` |  |
| 934.2 | β(U) ↔ α(U) + γ | β(U): Zr 0.01; γ: Zr 0.554 | model | [1] Xiong 2013; _cites Chevalier 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.03.005) | Table 1, p. 4, row 8; `ORC-GPDJHGMZ2T` |  |
| 932 | β(U) ↔ α(U) + γ | β(U): Zr 0.011; γ: Zr 0.57 | model | [1] Xiong 2013; _cites Baker 1992_ | Table 1, p. 4, row 12; `ORC-IPINE7UCDQ` |  |
| 893.3 | γ + α(U) ↔ δ | γ: Zr 0.673; α(U): Zr 0.0069; δ: Zr 0.636 | model | [1] Xiong 2013 | Table 1, p. 4, row 17; `ORC-FSLDIOTILF` |  |
| 890 | γ + α(U) ↔ δ | γ: Zr 0.66; α(U): Zr 0.005; δ: Zr 0.63 | model | [1] Xiong 2013; _cites Sheldon 1989_ [doi](https://doi.org/10.1007/bf02881432) | Table 1, p. 4, row 18; `ORC-54E6JN5VCH` |  |
| 890 | γ + α(U) ↔ δ | δ: Zr 0.625 | experimental | [1] Xiong 2013; _cites Duffey 1958_ | Table 1, p. 4, row 21; `ORC-DFLPZDVQNI` |  |
| 888.4 | γ ↔ α(U) + δ | γ: Zr 0.641; α(U): Zr 0.007; δ: Zr 0.64 | model | [1] Xiong 2013; _cites Chevalier 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.03.005) | Table 1, p. 4, row 15; `ORC-N74BIRE5RG` |  |
| 887.8 | γ + α(U) ↔ δ | γ: Zr 0.779; α(U): Zr 0.016; δ: Zr 0.635 | model | [1] Xiong 2013; _cites Kurata 2010_ | Table 1, p. 4, row 16; `ORC-GMDEM7IWPW` |  |
| 885 | γ + α(U) ↔ δ | δ: U 0.333333, Zr 0.666667 | experimental | [1] Xiong 2013; _cites Holden 1956_ | Table 1, p. 4, row 20; `ORC-UXCW6HAC3A` |  |
| 885 | γ + α(U) ↔ δ | γ: Zr 0.68; α(U): Zr 0.005; δ: Zr 0.65 | model | [1] Xiong 2013; _cites Baker 1992_ | Table 1, p. 4, row 19; `ORC-UZMM3XVZYS` |  |
| 883.5 | γ ↔ δ + α(Zr) | γ: Zr 0.814; δ: Zr 0.752; α(Zr): Zr 0.982 | model | [1] Xiong 2013; _cites Kurata 2010_ | Table 1, p. 4, row 24; `ORC-DUDWQNXCSS` |  |
| 883 | γ ↔ δ + α(Zr) | γ: Zr 0.78; δ: Zr 0.76; α(Zr): Zr 0.996 | model | [1] Xiong 2013; _cites Baker 1992_ | Table 1, p. 4, row 27; `ORC-LCCRELUQ75` |  |
| 882.9 | γ ↔ δ + α(Zr) | γ: Zr 0.801; δ: Zr 0.783; α(Zr): Zr 0.995 | model | [1] Xiong 2013; _cites Chevalier 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.03.005) | Table 1, p. 4, row 23; `ORC-PHWNY3KHJC` |  |
| 880 | γ + α(U) ↔ δ | δ: U 0.333333, Zr 0.666667 | experimental | [1] Xiong 2013; _cites Rough 1956_ [doi](https://doi.org/10.2172/4351828) | Table 1, p. 4, row 22; `ORC-NHLD7TLMIK` |  |
| 879 | γ ↔ δ + α(Zr) | γ: Zr 0.81; δ: Zr 0.78; α(Zr): Zr 0.996 | model | [1] Xiong 2013; _cites Sheldon 1989_ [doi](https://doi.org/10.1007/bf02881432) | Table 1, p. 4, row 26; `ORC-GQ6HNCD4YS` |  |
| 879 | γ ↔ δ + α(Zr) | γ: Zr 0.761; δ: U 0.333333, Zr 0.666667 | experimental | [1] Xiong 2013; _cites Duffey 1958_ | Table 1, p. 4, row 29; `ORC-NY7VDOJL5M` |  |
| 877.2 | γ ↔ δ + α(Zr) | γ: Zr 0.813; δ: Zr 0.793; α(Zr): Zr 0.987 | model | [1] Xiong 2013 | Table 1, p. 4, row 25; `ORC-247R462UAT` |  |
| 868 | γ ↔ δ + α(Zr) | δ: U 0.333333, Zr 0.666667 | experimental | [1] Xiong 2013; _cites Holden 1956_ | Table 1, p. 4, row 28; `ORC-WKRIUH5GWH` |  |
| 866 | γ ↔ δ + α(Zr) | δ: U 0.333333, Zr 0.666667 | experimental | [1] Xiong 2013; _cites Rough 1956_ [doi](https://doi.org/10.2172/4351828) | Table 1, p. 4, row 30; `ORC-QSX7BY2FUU` |  |

## Other properties

### Phase transition (16)

Table: Phase transition, U–Zr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 879.35 K | 879.35 | δ + bcc_A2; _alloy: U 0.219, Zr 0.781_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 8; `ORC-K7PMZM3WBP` |  |
| Phase transition | 879.4 K | 879.4 | δ + bcc_A2; _alloy: U 0.204, Zr 0.796_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 9; `ORC-L3FYN2NP55` |  |
| Phase transition | 880.05 K | 880.05 | δ + bcc_A2; _alloy: U 0.246, Zr 0.754_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 7; `ORC-PGPQA3CGKR` |  |
| Phase transition | 880.65 K | 880.65 | other: wt% Zr 60 (x(Zr) 0.796), T upper; _alloy: U 0.204, Zr 0.796_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 16; `ORC-IGIMRYHGXQ` |  |
| Phase transition | 881.2 K | 881.2 | δ + bcc_A2; _alloy: U 0.262, Zr 0.738_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 6; `ORC-W3GA426A3F` |  |
| Phase transition | 881.35 K | 881.35 | δ + bcc_A2; _alloy: U 0.277, Zr 0.723_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 5; `ORC-46ONGLHA2S` |  |
| Phase transition | 882.45 K | 882.45 | δ + bcc_A2; _alloy: U 0.293, Zr 0.707_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 4; `ORC-VO5XWS4TDQ` |  |
| Phase transition | 882.55 K | 882.55 | other: wt% Zr 54 (x(Zr) 0.754), T upper; _alloy: U 0.246, Zr 0.754_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 15; `ORC-XSBB6ZPPHX` |  |
| Phase transition | 884.25 K | 884.25 | other: wt% Zr 52 (x(Zr) 0.738), T upper; _alloy: U 0.262, Zr 0.738_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 14; `ORC-OGR2U4DC3F` |  |
| Phase transition | 884.45 K | 884.45 | other: wt% Zr 50 (x(Zr) 0.723), T upper; _alloy: U 0.277, Zr 0.723_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 13; `ORC-C5BJ63K5WM` |  |
| Phase transition | 884.8 K | 884.8 | δ + bcc_A2; _alloy: U 0.31, Zr 0.69_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 3; `ORC-BX7PZFVST3` |  |
| Phase transition | 885.95 K | 885.95 | other: wt% Zr 48 (x(Zr) 0.707), T upper; _alloy: U 0.293, Zr 0.707_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 12; `ORC-RDQLUJZIH7` |  |
| Phase transition | 886.9 K | 886.9 | δ + bcc_A2; _alloy: U 0.328, Zr 0.672_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 2; `ORC-7YCKNSTUKO` |  |
| Phase transition | 887.6 K | 887.6 | δ + bcc_A2; _alloy: U 0.365, Zr 0.635_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 1; `ORC-Q3S2UBZBFV` |  |
| Phase transition | 889.15 K | 889.15 | other: wt% Zr 40 (x(Zr) 0.635), T upper; _alloy: U 0.365, Zr 0.635_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 10; `ORC-W2EY5CBPOZ` |  |
| Phase transition | 890.65 K | 890.65 | other: wt% Zr 44 (x(Zr) 0.672), T upper; _alloy: U 0.328, Zr 0.672_ | experimental | [2] Chevalier 1998; _cites Duey 1958_ | Table 18, p. 18, row 11; `ORC-LIC3DJ4KPO` |  |

### Activity / EMF / Gibbs energy (20)

Table: Activity / EMF / Gibbs energy, U–Zr system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Activity U; _printed: a_U_ | 0.784 1 | 1773 | UNKNOWN; _alloy: U 0.86, Zr 0.14_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 5; `ORC-7VWGEBBUN3.b6eebb` |  |
| Activity U; _printed: a_U_ | 0.384 1 | 1773 | UNKNOWN; _alloy: U 0.654, Zr 0.346_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 4; `ORC-BYRX5BKQS7.25cbc8` |  |
| Activity U; _printed: a_U_ | 0.029 1 | 1773 | UNKNOWN; _alloy: U 0.098, Zr 0.902_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 1; `ORC-LARY6NMZU4.2c471a` |  |
| Activity U; _printed: a_U_ | 0.221 1 | 1773 | UNKNOWN; _alloy: U 0.285, Zr 0.715_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 2; `ORC-T3X7ZLJDYP.ccc39f` |  |
| Activity U; _printed: a_U_ | 0.231 1 | 1773 | UNKNOWN; _alloy: U 0.478, Zr 0.522_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 3; `ORC-ZW4NBEE3LZ.75239b` |  |
| Activity Zr; _printed: a_Zr_ | 0.033 1 | 1773 | UNKNOWN; _alloy: U 0.86, Zr 0.14_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 5; `ORC-7VWGEBBUN3.aa7ba1` |  |
| Activity Zr; _printed: a_Zr_ | 0.24 1 | 1773 | UNKNOWN; _alloy: U 0.654, Zr 0.346_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 4; `ORC-BYRX5BKQS7.9a2105` |  |
| Activity Zr; _printed: a_Zr_ | 0.861 1 | 1773 | UNKNOWN; _alloy: U 0.098, Zr 0.902_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 1; `ORC-LARY6NMZU4.7d4b8f` |  |
| Activity Zr; _printed: a_Zr_ | 0.571 1 | 1773 | UNKNOWN; _alloy: U 0.285, Zr 0.715_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 2; `ORC-T3X7ZLJDYP.eaeb5d` |  |
| Activity Zr; _printed: a_Zr_ | 0.557 1 | 1773 | UNKNOWN; _alloy: U 0.478, Zr 0.522_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 3; `ORC-ZW4NBEE3LZ.76bf27` |  |
| Chemical potential; _printed: ΔG_Zr_ | -50287 J/mol | 1773 | UNKNOWN; _alloy: U 0.86, Zr 0.14_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 5; `ORC-7VWGEBBUN3.09c806` |  |
| Chemical potential; _printed: ΔG_U_ | -3587 J/mol | 1773 | UNKNOWN; _alloy: U 0.86, Zr 0.14_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 5; `ORC-7VWGEBBUN3.0ea4f1` |  |
| Chemical potential; _printed: ΔG_Zr_ | -21038 J/mol | 1773 | UNKNOWN; _alloy: U 0.654, Zr 0.346_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 4; `ORC-BYRX5BKQS7.5e4e8f` |  |
| Chemical potential; _printed: ΔG_U_ | -14109 J/mol | 1773 | UNKNOWN; _alloy: U 0.654, Zr 0.346_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 4; `ORC-BYRX5BKQS7.e4baad` |  |
| Chemical potential; _printed: ΔG_U_ | -52191 J/mol | 1773 | UNKNOWN; _alloy: U 0.098, Zr 0.902_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 1; `ORC-LARY6NMZU4.277680` |  |
| Chemical potential; _printed: ΔG_Zr_ | -2206 J/mol | 1773 | UNKNOWN; _alloy: U 0.098, Zr 0.902_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 1; `ORC-LARY6NMZU4.89fb46` |  |
| Chemical potential; _printed: ΔG_U_ | -22254 J/mol | 1773 | UNKNOWN; _alloy: U 0.285, Zr 0.715_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 2; `ORC-T3X7ZLJDYP.5f13ea` |  |
| Chemical potential; _printed: ΔG_Zr_ | -8261 J/mol | 1773 | UNKNOWN; _alloy: U 0.285, Zr 0.715_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 2; `ORC-T3X7ZLJDYP.7ac168` |  |
| Chemical potential; _printed: ΔG_U_ | -21601 J/mol | 1773 | UNKNOWN; _alloy: U 0.478, Zr 0.522_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 3; `ORC-ZW4NBEE3LZ.1db536` |  |
| Chemical potential; _printed: ΔG_Zr_ | -8626 J/mol | 1773 | UNKNOWN; _alloy: U 0.478, Zr 0.522_ | experimental | [2] Chevalier 1998; _cites Kanno 1988_ [doi](https://doi.org/10.1016/0022-3115%2888%2990129-8) | Table 19, p. 18, row 3; `ORC-ZW4NBEE3LZ.828d9f` |  |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. 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). [doi:10.1016/j.jnucmat.2013.07.034](https://doi.org/10.1016/j.jnucmat.2013.07.034)
2. P.Y. Chevalier, E. Fischer, Thermodynamic modelling of the O–U–Zr system, Journal of Nuclear Materials 257, 213-255 (1998). [doi:10.1016/s0022-3115(98)00450-4](https://doi.org/10.1016/s0022-3115%2898%2900450-4)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- 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 the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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).

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_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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 ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).