# Al–U system

> Al–U system: 57 accepted literature values (crystal structure 21, invariant reaction 20, heat capacity / entropy / enthalpy 11, formation 5) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

57 accepted literature values from 3 paper(s) (experimental 15, model 17, DFT 25); 3 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/AL-U.json) · [CSV](https://data.orchid-project.org/systems/AL-U.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#AL-U) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#AL-U/AlU-08Wan.json) · [phases (10)](https://data.orchid-project.org/phases/pages/AL-U.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/AL-U.html) · [Markdown](https://data.orchid-project.org/systems/AL-U.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 15 |
| model | 17 |
| DFT | 25 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 20 |
| formation | 5 |
| heat capacity / entropy / enthalpy | 11 |
| crystal structure | 21 |

## 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 |
|---|---|---|---|
| AlU-08Wan.tdb | J. Wang, X.J. Liu, C.P. Wang, J. Nucl. Mater., 374, 79-86(2008). [doi:10.1016/j.jnucmat.2007.06.023](https://doi.org/10.1016/j.jnucmat.2007.06.023) | `c873310a9de11c896661cae78b9edf85d8cf05572f27b1e1755845df52d02b19` | [viewer](https://orchid-project.org/phase-diagrams/#AL-U/AlU-08Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlU-08Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlU-08Wan.json) |
| AlU-10Sed.tdb | D. Sedmidubsky, R.J.M. Konings, P. Soucek, J. Nucl. Mater., 397, 1-7(2010). [doi:10.1016/j.jnucmat.2009.11.023](https://doi.org/10.1016/j.jnucmat.2009.11.023) | `064d1a3f1f9b0fa854e84e76825929d3856a08b96c0f7b136bb6ef1f7e165190` | [viewer](https://orchid-project.org/phase-diagrams/#AL-U/AlU-10Sed.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlU-10Sed.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlU-10Sed.json) |
| AlU-10Zha.tdb | X. Zhang, Y.F. Cui, G.L. Xu, W.J. Zhu, H.S. Liu, B.Y. Yin, Z.P. Jin, J. Nucl. Mater., 402, 15-24(2010). [doi:10.1016/j.jnucmat.2010.04.018](https://doi.org/10.1016/j.jnucmat.2010.04.018) | `2ca2fd5f09bedc79b6e3665dbbdc0f84424e506f3ec039d8c617206a18c3de73` | [viewer](https://orchid-project.org/phase-diagrams/#AL-U/AlU-10Zha.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AlU-10Zha.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AlU-10Zha.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| AlU-08Wan.tdb | 1623.85 | LIQUID (x(U) 0.1586) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333) |
| AlU-08Wan.tdb | 1623.85 | LIQUID (x(U) 0.15854) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333) |
| AlU-08Wan.tdb | 1623.85 | LIQUID (x(U) 0.15868) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333) |
| AlU-08Wan.tdb | 1377.57 | AL2U_C15 (x(U) 0.33333) + LIQUID (x(U) 0.92813) + BCC_A2 (x(U) 0.9511) |
| AlU-08Wan.tdb | 1029.45 | AL2U_C15 (x(U) 0.33333) + BCC_A2 (x(U) 0.98591) + TETRAGONAL_U (x(U) 0.996) |
| AlU-08Wan.tdb | 1003.91 | LIQUID (x(U) 0.02959) + AL4U_BETA (x(U) 0.19197) + AL3U_L12 (x(U) 0.25) |
| AlU-08Wan.tdb | 1003.91 | LIQUID (x(U) 0.02959) + AL4U_BETA (x(U) 0.19197) + AL3U_L12 (x(U) 0.25) |
| AlU-08Wan.tdb | 938.89 | AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99829) + ORTHORHOMBIC_A20 (x(U) 0.99951) |
| AlU-08Wan.tdb | 938.89 | AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99833) + ORTHORHOMBIC_A20 (x(U) 0.99952) |
| AlU-08Wan.tdb | 919.34 | AL4U_BETA (x(U) 0.19202) + AL4U_D1B (x(U) 0.19202) + AL3U_L12 (x(U) 0.25) |
| AlU-08Wan.tdb | 919.34 | LIQUID (x(U) 0.01908) + AL4U_D1B (x(U) 0.18688) + AL4U_BETA (x(U) 0.18688) |
| AlU-08Wan.tdb | 914.25 | FCC_A1 (x(U) 0) + LIQUID (x(U) 0.0185) + AL4U_D1B (x(U) 0.18651) |
| AlU-10Sed.tdb | 1623.75 | LIQUID (x(U) 0.15957) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333) |
| AlU-10Sed.tdb | 1397.35 | AL2U_C15 (x(U) 0.33333) + LIQUID (x(U) 0.93659) + BCC_A2 (x(U) 0.95962) |
| AlU-10Sed.tdb | 1030.14 | AL2U_C15 (x(U) 0.33333) + BCC_A2 (x(U) 0.99011) + TETRAGONAL_U (x(U) 1) |
| AlU-10Sed.tdb | 1009.44 | LIQUID (x(U) 0.00391) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25) |
| AlU-10Sed.tdb | 942.02 | AL2U_C15 (x(U) 0.33333) + ORTHORHOMBIC_A20 (x(U) 1) + TETRAGONAL_U (x(U) 1) |
| AlU-10Sed.tdb | 932.53 | FCC_A1 (x(U) 0) + LIQUID (x(U) 0.00138) + AL4U_D1B (x(U) 0.2) |
| AlU-10Zha.tdb | 1623.85 | LIQUID (x(U) 0.1586) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333) |
| AlU-10Zha.tdb | 1623.85 | LIQUID (x(U) 0.15854) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333) |
| AlU-10Zha.tdb | 1623.85 | LIQUID (x(U) 0.15866) + AL3U_L12 (x(U) 0.25) + AL2U_C15 (x(U) 0.33333) |
| AlU-10Zha.tdb | 1377.57 | AL2U_C15 (x(U) 0.33333) + LIQUID (x(U) 0.92813) + BCC_A2 (x(U) 0.9511) |
| AlU-10Zha.tdb | 1029.45 | AL2U_C15 (x(U) 0.33333) + BCC_A2 (x(U) 0.98591) + TETRAGONAL_U (x(U) 0.996) |
| AlU-10Zha.tdb | 1002.52 | LIQUID (x(U) 0.02944) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25) |
| AlU-10Zha.tdb | 1002.52 | LIQUID (x(U) 0.02946) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25) |
| AlU-10Zha.tdb | 1002.52 | LIQUID (x(U) 0.02942) + AL4U_D1B (x(U) 0.2) + AL3U_L12 (x(U) 0.25) |
| AlU-10Zha.tdb | 938.89 | AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99829) + ORTHORHOMBIC_A20 (x(U) 0.99951) |
| AlU-10Zha.tdb | 938.89 | AL2U_C15 (x(U) 0.33333) + TETRAGONAL_U (x(U) 0.99833) + ORTHORHOMBIC_A20 (x(U) 0.99952) |
| AlU-10Zha.tdb | 913.76 | FCC_A1 (x(U) 0) + LIQUID (x(U) 0.01896) + AL4U_D1B (x(U) 0.2) |
| AlU-10Zha.tdb | 913.76 | FCC_A1 (x(U) 0) + LIQUID (x(U) 0.01885) + AL4U_D1B (x(U) 0.2) |
| AlU-10Zha.tdb | 913.76 | FCC_A1 (x(U) 0) + LIQUID (x(U) 0.01883) + AL4U_D1B (x(U) 0.2) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/AL/AL-U.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/AL/AL-U.json) · [CALPHAD hull AlU-08Wan](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-U--AlU-08Wan.json) · [CALPHAD hull AlU-10Zha](https://data.orchid-project.org/hulls/calphad-sgte/AL/AL-U--AlU-10Zha.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Al–U system (20)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1893.15 | congruent melting: L -> Al2U | Al2U: Al 0.667 | model | [1] Wang 2008 | Table 2, p. 5, row 20; `ORC-GNAOCYSWCG` |  |
| 1893.15 | congruent melting: L -> Al2U | Al2U: Al 0.667 | model | [1] Wang 2008; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 2, p. 5, row 19; `ORC-Y42CPML4L7` |  |
| 1863.15 | congruent melting: L -> Al2U | Al2U: Al 0.667 | experimental | [1] Wang 2008; _cites Cabane 1955_ | Table 2, p. 5, row 18; `ORC-HEV3GLGGDI` |  |
| 1624.15 | peritectic: L + Al2U -> Al3U | L: Al 0.845; Al2U: Al 0.667; Al3U: Al 0.75 | model | [1] Wang 2008 | Table 2, p. 5, row 15; `ORC-HL5CBLXQLS` |  |
| 1623.15 | peritectic: L + Al2U -> Al3U | L: Al 0.832; Al2U: Al 0.667; Al3U: Al 0.75 | experimental | [1] Wang 2008; _cites Cabane 1955_ | Table 2, p. 5, row 13; `ORC-43XSMSGLQO` |  |
| 1623.15 | peritectic: L + Al2U -> Al3U | L: Al 0.87; Al2U: Al 0.667; Al3U: Al 0.75 | model | [1] Wang 2008; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 2, p. 5, row 14; `ORC-JFUPSIP3XI` |  |
| 1378.15 | eutectic: L -> γ (U) + Al2U | L: Al 0.0713; γ (U): Al 0.0488; Al2U: Al 0.667 | model | [1] Wang 2008 | Table 2, p. 5, row 5; `ORC-6NF6PA2AQH` |  |
| 1378.15 | eutectic: L -> γ (U) + Al2U | γ (U): Al 0.047; Al2U: Al 0.667 | experimental | [1] Wang 2008; _cites Straatman 1964_ | Table 2, p. 5, row 3; `ORC-GMAH72XEVS` |  |
| 1378.15 | eutectic: L -> γ (U) + Al2U | L: Al 0.06; γ (U): Al 0.047; Al2U: Al 0.667 | model | [1] Wang 2008; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 2, p. 5, row 4; `ORC-TMWBHVENTM` |  |
| 1033.15 | eutectoid: γ (U) -> β (U) + Al2U | γ (U): Al 0.014; β (U): Al 0.0054; Al2U: Al 0.667 | experimental | [1] Wang 2008; _cites Straatman 1964_ | Table 2, p. 5, row 7; `ORC-CL63UXZXNM` |  |
| 1031.15 | eutectoid: γ (U) -> β (U) + Al2U | Al2U: Al 0.667 | model | [1] Wang 2008; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 2, p. 5, row 8; `ORC-EEE7LPW5PF` |  |
| 1029.15 | eutectoid: γ (U) -> β (U) + Al2U | γ (U): Al 0.0141; β (U): Al 0.004; Al2U: Al 0.667 | model | [1] Wang 2008 | Table 2, p. 5, row 9; `ORC-XR63QPS7WD` |  |
| 1023.15 | eutectoid: γ (U) -> β (U) + Al2U | γ (U): Al 0.014; β (U): Al 0.0054; Al2U: Al 0.667 | experimental | [1] Wang 2008; _cites Straatman 1964_ | Table 2, p. 5, row 6; `ORC-JYOQCS5TY7` |  |
| 1005.15 | peritectic: L + Al3U -> Al4U (β) | Al3U: Al 0.75, U 0.25; Al4U (β): Al 0.8, U 0.2 | experimental | [1] Wang 2008; _cites Cabane 1955_ | Table 2, p. 5, row 10; `ORC-KHE6DQ3MZS` |  |
| 1004.15 | peritectic: L + Al3U -> Al4U (β) | L: Al 0.972; Al3U: Al 0.75; Al4U (β): Al 0.814 | model | [1] Wang 2008 | Table 2, p. 5, row 12; `ORC-JTMSTH433H` |  |
| 1004.15 | peritectic: L + Al3U -> Al4U (β) | L: Al 0.977; Al3U: Al 0.75; Al4U (β): Al 0.818 | model | [1] Wang 2008; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 2, p. 5, row 11; `ORC-ORNBUBZIAO` |  |
| 919.15 | polymorphic: Al4U (α) -> Al4U (β) | Al4U (α): Al 0.8; Al4U (β): Al 0.828 | model | [1] Wang 2008; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 2, p. 5, row 16; `ORC-5CH4FFEDJH` |  |
| 919.15 | polymorphic: Al4U (α) -> Al4U (β) | Al4U (α): Al 0.809; Al4U (β): Al 0.824 | model | [1] Wang 2008 | Table 2, p. 5, row 17; `ORC-BYSIYYIPIE` |  |
| 914.15 | eutectic: L -> fcc (Al) + Al4U (α) | L: Al 0.982; fcc (Al): Al 1; Al4U (α): Al 0.824 | model | [1] Wang 2008 | Table 2, p. 5, row 2; `ORC-HA3L5ME46F` |  |
| 914.15 | eutectic: L -> fcc (Al) + Al4U (α) | L: Al 0.983; fcc (Al): Al 0.99993; Al4U (α): Al 0.828 | model | [1] Wang 2008; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 2, p. 5, row 1; `ORC-V6BILLWUX3` |  |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Al–U system (3)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| UAl2 |  | -86.1 kJ/mol (basis unstated) |  | DFT |  |  | [2] Sedmidubský 2010 | Table 2, p. 3, row 1; `ORC-MZ2XRS7TQV.bc1b6b` |  |
| UAl3 |  | -87 kJ/mol (basis unstated) |  | DFT |  |  | [2] Sedmidubský 2010 | Table 2, p. 3, row 4; `ORC-OZIZ5AB43L.9be73b` |  |
| UAl4 |  | -91.4 kJ/mol (basis unstated) |  | DFT |  |  | [2] Sedmidubský 2010 | Table 2, p. 3, row 9; `ORC-Q4GJG6AOOD.244cc8` |  |

## Other properties

### Formation (2)

Table: Formation, Al–U system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation; _printed: ΔfS°298_ | -1.1 J/mol (basis unstated)/K | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 1; `ORC-MZ2XRS7TQV.2f4240` |  |
| Entropy of formation; _printed: ΔfS°298_ | -13.1 J/mol (basis unstated)/K | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 4; `ORC-OZIZ5AB43L.95d6c3` |  |

### Heat capacity / entropy / enthalpy (11)

Table: Heat capacity / entropy / enthalpy, Al–U system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| heat content contribution; _printed: H°298 - H°0 (el.)_ | 0.67 kJ mol^-1 | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 1; `ORC-MZ2XRS7TQV.1460d1` |  |
| heat content contribution; _printed: H°298 - H°0 (ph.)_ | 24.2 kJ mol^-1 | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 1; `ORC-MZ2XRS7TQV.99d0f9` |  |
| heat content contribution; _printed: H°298 - H°0 (el.)_ | 0.65 kJ mol^-1 | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 4; `ORC-OZIZ5AB43L.ea4941` |  |
| heat content contribution; _printed: H°298 - H°0 (ph.)_ | 32.3 kJ mol^-1 | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 4; `ORC-OZIZ5AB43L.f45e55` |  |
| heat content contribution; _printed: H°298 − H°0 (el.)_ | 1 kJ mol−1 | 298.15 | UAl4; _alloy: U 0.2_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 9; `ORC-Q4GJG6AOOD.2fefc5` |  |
| heat content contribution; _printed: H°298 - H°0 (el.)_ | 1 kJ mol^-1 | 298.15 | UAl4; _alloy: U 0.2_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 9; `ORC-Q4GJG6AOOD.bab04f` |  |
| sm contribution; _printed: S°298 (ph.)_ | 101.2 J/mol (basis unstated)/K | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 1; `ORC-MZ2XRS7TQV.d5528a` |  |
| sm contribution; _printed: S°298 (el.)_ | 4.5 J/mol (basis unstated)/K | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 1; `ORC-MZ2XRS7TQV.e33b02` |  |
| sm contribution; _printed: S°298 (ph.)_ | 117.5 J/mol (basis unstated)/K | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 4; `ORC-OZIZ5AB43L.613532` |  |
| sm contribution; _printed: S°298 (el.)_ | 4.4 J/mol (basis unstated)/K | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 4; `ORC-OZIZ5AB43L.aa8542` |  |
| sm contribution; _printed: S°298 (el.)_ | 5.7 J/mol (basis unstated)/K | 298.15 | UAl4; _alloy: U 0.2_ | DFT | [2] Sedmidubský 2010 | Table 2, p. 3, row 9; `ORC-Q4GJG6AOOD.22d1ca` |  |

### Crystal structure (21)

Table: Crystal structure, Al–U system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 7.776 Å |  | UAl2; _alloy: U 0.333333_ | experimental | [3] Moussa 2018; _cites Steeb 1961_ [doi](https://doi.org/10.1007/bf00622102) | Table 1, p. 3, row 6; `ORC-7DYQUXIIPT.86f1ea` |  |
| Lattice a | 4.266 Å |  | UAl3; _alloy: U 0.25_ | experimental | [3] Moussa 2018; _cites Rundle 1949_ [doi](https://doi.org/10.1107/s0365110x49000400) | Table 1, p. 3, row 7; `ORC-6G2LISOKMO.ff4814` |  |
| Lattice a | 4.401 Å |  | UAl4; _alloy: U 0.2_ | experimental | [3] Moussa 2018; _cites Tougait 2004_ [doi](https://doi.org/10.1016/j.intermet.2003.09.012) | Table 1, p. 3, row 8; `ORC-VIIVCLH6Y4.2ad603` |  |
| Lattice a | 2.854 Å |  | αU; _αU: Al 0.001_ | model | [3] Moussa 2018; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 1, p. 3, row 1; `ORC-JFQL3FBXEF.f2cd2b` |  |
| Lattice a | 7.76 Å | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010; _cites Katz 1962_ [doi](https://doi.org/10.1016/0022-3115%2862%2990074-0) | Table 1, p. 2, row 1; `ORC-XYZXCX57VM.162a5a` |  |
| Lattice a | 4.253 Å | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010; _cites Petzow 1968_ [doi](https://doi.org/10.1016/0022-3115%2868%2990134-7) | Table 1, p. 2, row 4; `ORC-LVG7M6ZH2C.1c03c2` |  |
| Lattice a | 4.401 Å | 298.15 | UAl4; _alloy: U 0.2_ | DFT | [2] Sedmidubský 2010; _cites Zenou 2001_ [doi](https://doi.org/10.1016/s0925-8388%2801%2901675-9) | Table 1, p. 2, row 8; `ORC-MM2NNOL3R5.0c933e` |  |
| Lattice b | 7.776 Å |  | UAl2; _alloy: U 0.333333_ | experimental | [3] Moussa 2018; _cites Steeb 1961_ [doi](https://doi.org/10.1007/bf00622102) | Table 1, p. 3, row 6; `ORC-7DYQUXIIPT.1927f6` |  |
| Lattice b | 4.266 Å |  | UAl3; _alloy: U 0.25_ | experimental | [3] Moussa 2018; _cites Rundle 1949_ [doi](https://doi.org/10.1107/s0365110x49000400) | Table 1, p. 3, row 7; `ORC-6G2LISOKMO.9313a5` |  |
| Lattice b | 6.255 Å |  | UAl4; _alloy: U 0.2_ | experimental | [3] Moussa 2018; _cites Tougait 2004_ [doi](https://doi.org/10.1016/j.intermet.2003.09.012) | Table 1, p. 3, row 8; `ORC-VIIVCLH6Y4.aa2feb` |  |
| Lattice b | 5.867 Å |  | αU; _αU: Al 0.001_ | model | [3] Moussa 2018; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 1, p. 3, row 1; `ORC-JFQL3FBXEF.3fa83f` |  |
| Lattice b | 7.76 Å | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010; _cites Katz 1962_ [doi](https://doi.org/10.1016/0022-3115%2862%2990074-0) | Table 1, p. 2, row 1; `ORC-XYZXCX57VM.768a5b` |  |
| Lattice b | 4.253 Å | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010; _cites Petzow 1968_ [doi](https://doi.org/10.1016/0022-3115%2868%2990134-7) | Table 1, p. 2, row 4; `ORC-LVG7M6ZH2C.e9a27d` |  |
| Lattice b | 6.246 Å | 298.15 | UAl4; _alloy: U 0.2_ | DFT | [2] Sedmidubský 2010; _cites Zenou 2001_ [doi](https://doi.org/10.1016/s0925-8388%2801%2901675-9) | Table 1, p. 2, row 8; `ORC-MM2NNOL3R5.7cd4a2` |  |
| Lattice c | 7.776 Å |  | UAl2; _alloy: U 0.333333_ | experimental | [3] Moussa 2018; _cites Steeb 1961_ [doi](https://doi.org/10.1007/bf00622102) | Table 1, p. 3, row 6; `ORC-7DYQUXIIPT.6f6b74` |  |
| Lattice c | 4.266 Å |  | UAl3; _alloy: U 0.25_ | experimental | [3] Moussa 2018; _cites Rundle 1949_ [doi](https://doi.org/10.1107/s0365110x49000400) | Table 1, p. 3, row 7; `ORC-6G2LISOKMO.64ddd4` |  |
| Lattice c | 13.727 Å |  | UAl4; _alloy: U 0.2_ | experimental | [3] Moussa 2018; _cites Tougait 2004_ [doi](https://doi.org/10.1016/j.intermet.2003.09.012) | Table 1, p. 3, row 8; `ORC-VIIVCLH6Y4.a626a5` |  |
| Lattice c | 4.954 Å |  | αU; _αU: Al 0.001_ | model | [3] Moussa 2018; _cites Kassner 1989_ [doi](https://doi.org/10.1016/0022-3115%2889%2990438-8) | Table 1, p. 3, row 1; `ORC-JFQL3FBXEF.8ee429` |  |
| Lattice c | 7.76 Å | 298.15 | UAl2; _alloy: U 0.333333_ | DFT | [2] Sedmidubský 2010; _cites Katz 1962_ [doi](https://doi.org/10.1016/0022-3115%2862%2990074-0) | Table 1, p. 2, row 1; `ORC-XYZXCX57VM.fcc328` |  |
| Lattice c | 4.253 Å | 298.15 | UAl3; _alloy: U 0.25_ | DFT | [2] Sedmidubský 2010; _cites Petzow 1968_ [doi](https://doi.org/10.1016/0022-3115%2868%2990134-7) | Table 1, p. 2, row 4; `ORC-LVG7M6ZH2C.015348` |  |
| Lattice c | 13.72 Å | 298.15 | UAl4; _alloy: U 0.2_ | DFT | [2] Sedmidubský 2010; _cites Zenou 2001_ [doi](https://doi.org/10.1016/s0925-8388%2801%2901675-9) | Table 1, p. 2, row 8; `ORC-MM2NNOL3R5.0dd0ec` |  |

## Sources

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

1. J. Wang, X.J. Liu, C.P. Wang, Thermodynamic modeling of the Al–U and Co–U systems, Journal of Nuclear Materials 374, 79-86 (2008). [doi:10.1016/j.jnucmat.2007.06.023](https://doi.org/10.1016/j.jnucmat.2007.06.023)
2. D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010). [doi:10.1016/j.jnucmat.2009.11.023](https://doi.org/10.1016/j.jnucmat.2009.11.023)
3. Chantal Moussa, Alexandre Berche, José Barbosa, Mathieu Pasturel, Bertrand Stepnik, Olivier Tougait, Experimental investigation of the phase equilibria and thermodynamic assessment in the U-Ga and U-Al-Ga systems, Journal of Nuclear Materials 499, 361-371 (2018). [doi:10.1016/j.jnucmat.2017.11.037](https://doi.org/10.1016/j.jnucmat.2017.11.037)

## 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/).