# B–U system

> B–U system: 155 accepted literature values (heat capacity / entropy / enthalpy 113, crystal structure 21, phase transition 18, formation 3) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

155 accepted literature values from 1 paper(s) (experimental 114, model 41); 0 calculated phase diagram(s).

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

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 114 |
| model | 41 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| phase transition | 18 |
| formation | 3 |
| heat capacity / entropy / enthalpy | 113 |
| crystal structure | 21 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/B/B-U.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/B/B-U.json)

## 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, B–U system (3)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| B0.667U0.333(S) |  | -54.81 kJ/mol-atom | 298.15 | model |  |  | [1] Chevalier 2001 | Table 34, p. 28, row 12; `ORC-6OXUD4K72N.43fdc4` |  |
| B0.800U0.200(S) | [UB4](https://data.orchid-project.org/compounds/UB4.html) | -46.837 kJ/mol-atom | 298.15 | model | -49.016 (mp-aaaaaaxv) | -49.041 (oqmd-4686) | [1] Chevalier 2001 | Table 34, p. 28, row 13; `ORC-ACOUH357JL.aaeb13` |  |
| B0.923U0.077(S) |  | -29.753 kJ/mol-atom | 298.15 | model |  |  | [1] Chevalier 2001 | Table 34, p. 28, row 11; `ORC-GYQQ7FV2XU.3f589c` |  |

## Other properties

### Phase transition (18)

Table: Phase transition, B–U system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1380 K | 1380 | eutectic | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 1; `ORC-DURA3FNHPH` |  |
| Phase transition | 1933 K | 1933 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 2; `ORC-P2O3SJCXDQ` |  |
| Phase transition | 2048 K | 2048 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 3; `ORC-4XZHWQCBXJ` |  |
| Phase transition | 2273 K | 2273 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 4; `ORC-3OYGKKK5WF` |  |
| Phase transition | 2298 K | 2298 | other | experimental | [1] Chevalier 2001; _cites Mar 1975_ | Table 26, p. 23, row 17; `ORC-CHWMSCNCRA` |  |
| Phase transition | 2309 K | 2309 | eutectic | experimental | [1] Chevalier 2001; _cites Mar 1975_ | Table 26, p. 23, row 18; `ORC-SME7CUGYNL` |  |
| Phase transition | 2348 K | 2348 | other | experimental | [1] Chevalier 2001; _cites Mar 1975_ | Table 26, p. 23, row 16; `ORC-7OOEOW4KC5` |  |
| Phase transition | 2367 K | 2367 | other | experimental | [1] Chevalier 2001; _cites Mar 1975_ | Table 26, p. 23, row 15; `ORC-RA25DANWXG` |  |
| Phase transition | 2406 K | 2406 | other | experimental | [1] Chevalier 2001; _cites Mar 1975_ | Table 26, p. 23, row 13; `ORC-TG7OAIVV2R` |  |
| Phase transition | 2409 K | 2409 | other | experimental | [1] Chevalier 2001; _cites Mar 1975_ | Table 26, p. 23, row 14; `ORC-FJNCROTR7X` |  |
| Phase transition | 2508 K | 2508 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 12; `ORC-CMTEQRQP2W` |  |
| Phase transition | 2533 K | 2533 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 5; `ORC-EF5WZAPTG5` |  |
| Phase transition | 2548 K | 2548 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 11; `ORC-DP76UFWJUG` |  |
| Phase transition | 2613 K | 2613 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 8; `ORC-6P2I2CMU7O` |  |
| Phase transition | 2658 K | 2658 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 6; `ORC-MSVQH6XF5Q` |  |
| Phase transition | 2663 K | 2663 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 9; `ORC-IAWTQRJANU` |  |
| Phase transition | 2703 K | 2703 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 7; `ORC-NJIGOH3EEX` |  |
| Phase transition | 2768 K | 2768 | other | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 26, p. 23, row 10; `ORC-3HITTXVACQ` |  |

### Heat capacity / entropy / enthalpy (113)

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

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: S°298.15_ | 18.175 J/mol-atom/K | 298.15 | B0.667U0.333(S); _alloy: U 0.333_ | model | [1] Chevalier 2001 | Table 34, p. 28, row 12; `ORC-6OXUD4K72N.0964b5` |  |
| Entropy; _printed: S°298.15_ | 13.682 J/mol-atom/K | 298.15 | B0.800U0.200(S); _alloy: U 0.2_ | model | [1] Chevalier 2001 | Table 34, p. 28, row 13; `ORC-ACOUH357JL.4b5ee6` |  |
| Entropy; _printed: S°298.15_ | 7.5191 J/mol-atom/K | 298.15 | B0.923U0.077(S); _alloy: U 0.077_ | model | [1] Chevalier 2001 | Table 34, p. 28, row 11; `ORC-GYQQ7FV2XU.b4c96e` |  |
| Heat capacity; _printed: Cp_ | 18.575 J/mol-atom/K | 298.15 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 1; `ORC-SX4BAIAJDN` |  |
| Heat capacity; _printed: Cp_ | 18.587 J/mol-atom/K | 298.15 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Flotow 1969_ [doi](https://doi.org/10.1063/1.1672038) | Table 27, p. 23, row 1; `ORC-XK3PPBGLE7` |  |
| Heat capacity; _printed: Cp_ | 18.66 J/mol-atom/K | 300 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 2; `ORC-DRQW3XIVBY` |  |
| Heat capacity; _printed: Cp_ | 18.684 J/mol-atom/K | 300.4 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Flotow 1969_ [doi](https://doi.org/10.1063/1.1672038) | Table 27, p. 23, row 2; `ORC-SX6ETL5J4Y` |  |
| Heat capacity; _printed: Cp_ | 19.087 J/mol-atom/K | 310.6 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Flotow 1969_ [doi](https://doi.org/10.1063/1.1672038) | Table 27, p. 23, row 3; `ORC-ID2CY4V6EX` |  |
| Heat capacity; _printed: Cp_ | 19.51 J/mol-atom/K | 320.84 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Flotow 1969_ [doi](https://doi.org/10.1063/1.1672038) | Table 27, p. 23, row 4; `ORC-C6N5EOAVSR` |  |
| Heat capacity; _printed: Cp_ | 19.889 J/mol-atom/K | 330.94 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Flotow 1969_ [doi](https://doi.org/10.1063/1.1672038) | Table 27, p. 23, row 5; `ORC-ZDI62FNVY5` |  |
| Heat capacity; _printed: Cp_ | 20.245 J/mol-atom/K | 340.91 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Flotow 1969_ [doi](https://doi.org/10.1063/1.1672038) | Table 27, p. 23, row 6; `ORC-F6SG6DC6YS` |  |
| Heat capacity; _printed: Cp_ | 20.49 J/mol-atom/K | 348.31 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Flotow 1969_ [doi](https://doi.org/10.1063/1.1672038) | Table 27, p. 23, row 7; `ORC-5VUGUVM3S2` |  |
| Heat capacity; _printed: Cp_ | 22.085 J/mol-atom/K | 400 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 3; `ORC-U6WTPW4VAT` |  |
| Heat capacity; _printed: Cp_ | 24.234 J/mol-atom/K | 500 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 4; `ORC-HJ2UZOVZEQ` |  |
| Heat capacity; _printed: Cp_ | 25.806 J/mol-atom/K | 600 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 5; `ORC-KI7TT7LLCH` |  |
| Heat capacity; _printed: Cp_ | 27.056 J/mol-atom/K | 700 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 6; `ORC-BSA77WRZFG` |  |
| Heat capacity; _printed: Cp_ | 28.095 J/mol-atom/K | 800 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 7; `ORC-HM5SPETTZ3` |  |
| Heat capacity; _printed: Cp_ | 28.965 J/mol-atom/K | 900 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 8; `ORC-EE3KBLHI4H` |  |
| Heat capacity; _printed: Cp_ | 29.709 J/mol-atom/K | 1000 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 9; `ORC-YY7SYXVKCF` |  |
| Heat capacity; _printed: Cp_ | 30.341 J/mol-atom/K | 1100 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 10; `ORC-NKTLOGN6DE` |  |
| Heat capacity; _printed: Cp_ | 30.861 J/mol-atom/K | 1200 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 11; `ORC-BLPK65R5YG` |  |
| Heat capacity; _printed: Cp_ | 31.296 J/mol-atom/K | 1300 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 12; `ORC-OL5SGAPXB4` |  |
| Heat capacity; _printed: Cp_ | 31.633 J/mol-atom/K | 1400 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 13; `ORC-5XYT276YIQ` |  |
| Heat capacity; _printed: Cp_ | 31.942 J/mol-atom/K | 1500 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 15; `ORC-56AWY652Q3` |  |
| Heat capacity; _printed: Cp_ | 31.899 J/mol-atom/K | 1500 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 29, p. 24, row 14; `ORC-7LBCLJHW3A` |  |
| Heat capacity; _printed: Cp_ | 32.742 J/mol-atom/K | 1600 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 16; `ORC-C7YRSD2GOG` |  |
| Heat capacity; _printed: Cp_ | 33.823 J/mol-atom/K | 1700 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 17; `ORC-KT5JWYQXXT` |  |
| Heat capacity; _printed: Cp_ | 35.283 J/mol-atom/K | 1800 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 18; `ORC-MIPXWDKORL` |  |
| Heat capacity; _printed: Cp_ | 37.179 J/mol-atom/K | 1900 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 19; `ORC-34VYDSVX5K` |  |
| Heat capacity; _printed: Cp_ | 39.594 J/mol-atom/K | 2000 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 20; `ORC-FRZ3J4M24N` |  |
| Heat capacity; _printed: Cp_ | 42.598 J/mol-atom/K | 2100 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 21; `ORC-HEAGL26F7G` |  |
| Heat capacity; _printed: Cp_ | 46.263 J/mol-atom/K | 2200 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 22; `ORC-YHJLDBWM7O` |  |
| Heat capacity; _printed: Cp_ | 50.657 J/mol-atom/K | 2300 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 23; `ORC-UNAYCUDQQB` |  |
| Heat capacity; _printed: Cp_ | 55.88 J/mol-atom/K | 2400 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 24; `ORC-CTMXOXFYWZ` |  |
| Heat capacity; _printed: Cp_ | 61.973 J/mol-atom/K | 2500 | B2U; _alloy: U 0.333333_ | model | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 29, p. 24, row 25; `ORC-I2FV2CSJKK` |  |
| Heat content; _printed: HT-H298_ | 6342 J/g at. | 579.3 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 1; `ORC-3FBK3L6LVY` |  |
| Heat content; _printed: HT-H298_ | 6396 J/g at. | 579.3 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 2; `ORC-JDR5WTYVMG` |  |
| Heat content; _printed: HT-H298_ | 8730 J/g at. | 669.5 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 3; `ORC-EKO54C2F6C` |  |
| Heat content; _printed: HT-H298_ | 8760 J/g at. | 669.5 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 4; `ORC-GBFZFG5K4R` |  |
| Heat content; _printed: HT-H298_ | 10231 J/g at. | 723.9 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 6; `ORC-J2KCG6LPHU` |  |
| Heat content; _printed: HT-H298_ | 10209 J/g at. | 723.9 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 5; `ORC-JRK4WEOXHB` |  |
| Heat content; _printed: HT-H298_ | 11618 J/g at. | 772.7 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 7; `ORC-DZKP6CQ3WB` |  |
| Heat content; _printed: HT-H298_ | 11577 J/g at. | 772.7 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 8; `ORC-SCAFMKFJVX` |  |
| Heat content; _printed: HT-H298_ | 13069 J/g at. | 826.2 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 9; `ORC-MQ7NQORYZC` |  |
| Heat content; _printed: HT-H298_ | 13077 J/g at. | 826.2 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 10; `ORC-VV6B53I5OJ` |  |
| Heat content; _printed: HT-H298_ | 14359 J/g at. | 871.2 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 12; `ORC-P5X6MJIV5N` |  |
| Heat content; _printed: HT-H298_ | 14329 J/g at. | 871.2 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 11; `ORC-RGJHJMSOST` |  |
| Heat content; _printed: HT-H298_ | 16328 J/g at. | 940.1 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 13; `ORC-3JUGJ7BEAF` |  |
| Heat content; _printed: HT-H298_ | 16352 J/g at. | 940.1 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 14; `ORC-SPFZEIX54U` |  |
| Heat content; _printed: HT-H298_ | 18758 J/g at. | 1021.7 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 16; `ORC-3M4J6YRJA7` |  |
| Heat content; _printed: HT-H298_ | 18755 J/g at. | 1021.7 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 15; `ORC-KIDOR7PBJE` |  |
| Heat content; _printed: HT-H298_ | 20733 J/g at. | 1087.6 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 18; `ORC-RPTS3MO7YY` |  |
| Heat content; _printed: HT-H298_ | 20787 J/g at. | 1087.6 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 17; `ORC-X2GKHJRYDV` |  |
| Heat content; _printed: HT-H298_ | 22195 J/g at. | 1135.8 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 19; `ORC-FNMQZQMTJG` |  |
| Heat content; _printed: HT-H298_ | 22195 J/g at. | 1135.8 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 20; `ORC-PYB7EHC4MZ` |  |
| Heat content; _printed: HT-H298_ | 23769 J/g at. | 1187.2 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 22; `ORC-5MZYIHSBKW` |  |
| Heat content; _printed: HT-H298_ | 23759 J/g at. | 1187.2 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 21; `ORC-RZNJJRE4C5` |  |
| Heat content; _printed: HT-H298_ | 23819 J/g at. | 1189.8 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 23; `ORC-7PDOE5I6TS` |  |
| Heat content; _printed: HT-H298_ | 23849 J/g at. | 1189.8 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 24; `ORC-IN2YBC5OT6` |  |
| Heat content; _printed: HT-H298_ | 25452 J/g at. | 1240.7 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 25; `ORC-DLLCMGXW7A` |  |
| Heat content; _printed: HT-H298_ | 25422 J/g at. | 1240.7 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 26; `ORC-YZHG5BGVOT` |  |
| Heat content; _printed: HT-H298_ | 27068 J/g at. | 1293.5 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 28; `ORC-APWXMIAXKX` |  |
| Heat content; _printed: HT-H298_ | 27095 J/g at. | 1293.5 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 27; `ORC-PFSZCOBSMH` |  |
| Heat content; _printed: HT-H298_ | 27327 J/g at. | 1303 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 37; `ORC-A7HSPXL6QQ` |  |
| Heat content; _printed: HT-H298_ | 27366 J/g at. | 1303 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 38; `ORC-DGAFHLKXDY` |  |
| Heat content; _printed: HT-H298_ | 23328 J/g at. | 1324 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 2; `ORC-MKGXCGC2AR` |  |
| Heat content; _printed: HT-H298_ | 23577 J/g at. | 1324 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 1; `ORC-W4DIIVRONI` |  |
| Heat content; _printed: HT-H298_ | 28495 J/g at. | 1338.1 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 29; `ORC-6Y3RFZISL3` |  |
| Heat content; _printed: HT-H298_ | 28469 J/g at. | 1338.1 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 30; `ORC-MYFZAWLSUF` |  |
| Heat content; _printed: HT-H298_ | 29977 J/g at. | 1386.9 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 31; `ORC-6S2BH2PJQD` |  |
| Heat content; _printed: HT-H298_ | 30012 J/g at. | 1386.9 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 32; `ORC-HBFVLSA6GB` |  |
| Heat content; _printed: HT-H298_ | 30332 J/g at. | 1397 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 40; `ORC-6OGF5TN4PZ` |  |
| Heat content; _printed: HT-H298_ | 30066 J/g at. | 1397 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 39; `ORC-TWTPK2Y4QQ` |  |
| Heat content; _printed: HT-H298_ | 26186 J/g at. | 1426 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 4; `ORC-3O47EIPPXZ` |  |
| Heat content; _printed: HT-H298_ | 26230 J/g at. | 1426 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 3; `ORC-RFJE4VR2YX` |  |
| Heat content; _printed: HT-H298_ | 31576 J/g at. | 1435.9 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 33; `ORC-REISYMYO5Q` |  |
| Heat content; _printed: HT-H298_ | 31571 J/g at. | 1435.9 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 34; `ORC-Y3O3RX7FB4` |  |
| Heat content; _printed: HT-H298_ | 33165 J/g at. | 1485.8 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1969_ | Table 28, p. 24, row 35; `ORC-XB5QRZJR5H` |  |
| Heat content; _printed: HT-H298_ | 33169 J/g at. | 1485.8 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 36; `ORC-YOT2TFZRUN` |  |
| Heat content; _printed: HT-H298_ | 33487 J/g at. | 1496 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 41; `ORC-AAWYWXMRWL` |  |
| Heat content; _printed: HT-H298_ | 33497 J/g at. | 1496 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 42; `ORC-CKTA7JITTQ` |  |
| Heat content; _printed: HT-H298_ | 28740 J/g at. | 1526 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 5; `ORC-JS4SVDLOTM` |  |
| Heat content; _printed: HT-H298_ | 29045 J/g at. | 1526 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 6; `ORC-YZZVRBVX66` |  |
| Heat content; _printed: HT-H298_ | 36989 J/g at. | 1604 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 44; `ORC-DYUJQYZGPO` |  |
| Heat content; _printed: HT-H298_ | 37035 J/g at. | 1604 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 43; `ORC-HWOR7KMNY2` |  |
| Heat content; _printed: HT-H298_ | 31957 J/g at. | 1626 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 8; `ORC-HRE7CGEOYM` |  |
| Heat content; _printed: HT-H298_ | 31660 J/g at. | 1626 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 7; `ORC-IPNWHHSS4G` |  |
| Heat content; _printed: HT-H298_ | 39466 J/g at. | 1679 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 46; `ORC-PDERTOSHQS` |  |
| Heat content; _printed: HT-H298_ | 39189 J/g at. | 1679 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 45; `ORC-QAJ23Q4EZP` |  |
| Heat content; _printed: HT-H298_ | 34680 J/g at. | 1726 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 9; `ORC-EQPSBKQW3T` |  |
| Heat content; _printed: HT-H298_ | 34918 J/g at. | 1726 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 10; `ORC-YHGJLVUBTY` |  |
| Heat content; _printed: HT-H298_ | 43585 J/g at. | 1814 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 47; `ORC-6PUHYDTHXU` |  |
| Heat content; _printed: HT-H298_ | 44122 J/g at. | 1814 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 48; `ORC-KNGMOTWSQG` |  |
| Heat content; _printed: HT-H298_ | 38166 J/g at. | 1834 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 12; `ORC-7ZVGEPZDB7` |  |
| Heat content; _printed: HT-H298_ | 37810 J/g at. | 1834 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 11; `ORC-LCDIUUVQ7Z` |  |
| Heat content; _printed: HT-H298_ | 47059 J/g at. | 1896 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 49; `ORC-3AU2VEVE27` |  |
| Heat content; _printed: HT-H298_ | 47099 J/g at. | 1896 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 50; `ORC-LNTUVWT2MU` |  |
| Heat content; _printed: HT-H298_ | 41707 J/g at. | 1950 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 14; `ORC-ASSMC4PO3X` |  |
| Heat content; _printed: HT-H298_ | 41440 J/g at. | 1950 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 13; `ORC-XM4C3L7R2U` |  |
| Heat content; _printed: HT-H298_ | 50726 J/g at. | 1991 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 52; `ORC-HSF7DF26K2` |  |
| Heat content; _printed: HT-H298_ | 50699 J/g at. | 1991 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 51; `ORC-ULRICPGHD5` |  |
| Heat content; _printed: HT-H298_ | 44840 J/g at. | 2046 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 15; `ORC-B3OV2NQUD2` |  |
| Heat content; _printed: HT-H298_ | 44676 J/g at. | 2046 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 16; `ORC-JXNAKEY32C` |  |
| Heat content; _printed: HT-H298_ | 55265 J/g at. | 2110 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 53; `ORC-HWLMBXMY2H` |  |
| Heat content; _printed: HT-H298_ | 55611 J/g at. | 2110 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 54; `ORC-M7IXVO3LPC` |  |
| Heat content; _printed: HT-H298_ | 47490 J/g at. | 2138 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 17; `ORC-HI6UGYHOAW` |  |
| Heat content; _printed: HT-H298_ | 47550 J/g at. | 2138 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 18; `ORC-HSCZYFHRRE` |  |
| Heat content; _printed: HT-H298_ | 59767 J/g at. | 2206 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 55; `ORC-6E3XPRYAEE` |  |
| Heat content; _printed: HT-H298_ | 59897 J/g at. | 2206 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 56; `ORC-AL2RUYHHPR` |  |
| Heat content; _printed: HT-H298_ | 50130 J/g at. | 2224 | B12U; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Mar 1972_ [doi](https://doi.org/10.1063/1.1678228) | Table 30, p. 24, row 19; `ORC-S2REI36HGH` |  |
| Heat content; _printed: HT-H298_ | 50259 J/g at. | 2224 | B12U; _alloy: U 0.076923_ | model | [1] Chevalier 2001 | Table 30, p. 24, row 20; `ORC-X7CVRG4Y6K` |  |
| Heat content; _printed: HT-H298_ | 64459 J/g at. | 2300 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001 | Table 28, p. 24, row 58; `ORC-AN6YFNOUV2` |  |
| Heat content; _printed: HT-H298_ | 64623 J/g at. | 2300 | B2U; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Fredrickson 1970_ | Table 28, p. 24, row 57; `ORC-PHHCEYV4JC` |  |

### Crystal structure (21)

Table: Crystal structure, B–U system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 7.473 Å | 298.15 | UB12; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Bertaud 1949_ | Table 25, p. 22, row 1; `ORC-7BNJ6GRAXJ` |  |
| Lattice a | 7.4773 not_printed ± 5.500e-4 | 298.15 | UB12; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 25, p. 22, row 3; `ORC-IAB4QB3PCJ` |  |
| Lattice a | 7.468 Å | 298.15 | UB12; _alloy: U 0.076923_ | experimental | [1] Chevalier 2001; _cites Blum 1954_ [doi](https://doi.org/10.1107/s0365110x54000151) | Table 25, p. 22, row 2; `ORC-TM2BJCLHJI` |  |
| Lattice a | 3.1314 not_printed ± 3.000e-4 | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 25, p. 22, row 9; `ORC-23BSWKDWPS.7d59b7` |  |
| Lattice a | 3.136 Å | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Brewer 1951_ | Table 25, p. 22, row 7; `ORC-EZR5HXIAP2.1878a5` |  |
| Lattice a | 3.1293 not_printed ± 3.000e-4 | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 25, p. 22, row 8; `ORC-WJGRER65U5.db34d2` |  |
| Lattice a | 7.066 Å | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Bertaud 1949_ | Table 25, p. 22, row 5; `ORC-5RD4PVTIAG.101e08` |  |
| Lattice a | 7.075 Å | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Brewer 1951_ | Table 25, p. 22, row 4; `ORC-OKM27L6TCG.d57e88` |  |
| Lattice a | 7.08 Å | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Blum 1954_ [doi](https://doi.org/10.1107/s0365110x54000151) | Table 25, p. 22, row 6; `ORC-XQVXLPB2V7.2db4f9` |  |
| Lattice c | 3.9857 not_printed ± 5.000e-4 | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 25, p. 22, row 9; `ORC-23BSWKDWPS.7d2632` |  |
| Lattice c | 3.988 Å | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Brewer 1951_ | Table 25, p. 22, row 7; `ORC-EZR5HXIAP2.64286f` |  |
| Lattice c | 3.9893 not_printed ± 5.000e-4 | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 25, p. 22, row 8; `ORC-WJGRER65U5.24ea54` |  |
| Lattice c | 3.97 Å | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Bertaud 1949_ | Table 25, p. 22, row 5; `ORC-5RD4PVTIAG.7313e5` |  |
| Lattice c | 3.979 Å | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Brewer 1951_ | Table 25, p. 22, row 4; `ORC-OKM27L6TCG.e19c2a` |  |
| Lattice c | 3.978 Å | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Blum 1954_ [doi](https://doi.org/10.1107/s0365110x54000151) | Table 25, p. 22, row 6; `ORC-XQVXLPB2V7.ea0519` |  |
| lattice c a | 1.273 not_printed | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 25, p. 22, row 9; `ORC-23BSWKDWPS.97f0bc` |  |
| lattice c a | 1.272 not_printed | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Brewer 1951_ | Table 25, p. 22, row 7; `ORC-EZR5HXIAP2.3e4efd` |  |
| lattice c a | 1.275 not_printed | 298.15 | UB2; _alloy: U 0.333333_ | experimental | [1] Chevalier 2001; _cites Howlett 1960_ | Table 25, p. 22, row 8; `ORC-WJGRER65U5.f8821b` |  |
| lattice c a | 0.56 not_printed | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Bertaud 1949_ | Table 25, p. 22, row 5; `ORC-5RD4PVTIAG.6b3812` |  |
| lattice c a | 0.562 not_printed | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Brewer 1951_ | Table 25, p. 22, row 4; `ORC-OKM27L6TCG.ebf94d` |  |
| lattice c a | 0.562 not_printed | 298.15 | UB4; _alloy: U 0.2_ | experimental | [1] Chevalier 2001; _cites Blum 1954_ [doi](https://doi.org/10.1107/s0365110x54000151) | Table 25, p. 22, row 6; `ORC-XQVXLPB2V7.3999bc` |  |

## Sources

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

1. P.Y Chevalier, E Fischer, Thermodynamic modelling of the C–U and B–U binary systems, Journal of Nuclear Materials 288, 100-129 (2001). [doi:10.1016/s0022-3115(00)00713-3](https://doi.org/10.1016/s0022-3115%2800%2900713-3)

## 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-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); 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); 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.

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_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/).