Si–U system
41 accepted literature values from 1 paper(s) (experimental 24, model 17); 3 calculated phase diagram(s). 6 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.
Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (15) · papers (bibliography) · Markdown
| Evidence class | Values |
|---|---|
| experimental | 24 |
| model | 17 |
| Property group | Values |
|---|---|
| phase transition | 12 |
| phase equilibrium | 5 |
| formation | 24 |
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.
| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| SiU-04Che-LB.tdb | P.-Y. Chevalier, E. Fischer, unpublished work, 2004. | 84486566b19cb138031b465e37b18ece92a359534170a723ad939f5cd5611038 | viewer · TDB · JSON |
| SiU-09Ber.tdb | A. Berche, C. Rado, O. Rapaud, C. Gueneau, J. Rogez, J. Nucl. Mater., 389, 101-7(2009). doi:10.1016/j.jnucmat.2009.01.014 | 145f0a0d4b59bca1fec508ce829d2528d98fa56c9e95f1acd3e3120618d30dbc | viewer · TDB · JSON |
| SiU-98AEA.tdb | AEA Harwell, unpublished, 1998. | ad20359bfb8262bf9f5c0d6705cba31e8dd0654d2d91e44a987d898df1edfd79 | viewer · TDB · JSON |
| TDB file | T (K) | Phases at the invariant |
|---|---|---|
| SiU-04Che-LB.tdb | 1975.44 | LIQUID (x(U) 0.30846) + SI2U_CC (x(U) 0.34722) + SI5U3_C32 (x(U) 0.375) |
| SiU-04Che-LB.tdb | 1975.44 | LIQUID (x(U) 0.30836) + SI2U_CC (x(U) 0.34722) + SI5U3_C32 (x(U) 0.375) |
| SiU-04Che-LB.tdb | 1975.44 | LIQUID (x(U) 0.30869) + SI2U_CC (x(U) 0.34722) + SI5U3_C32 (x(U) 0.375) |
| SiU-04Che-LB.tdb | 1849.6 | SI5U3_C32 (x(U) 0.375) + SIU_B27 (x(U) 0.489) + LIQUID (x(U) 0.49287) |
| SiU-04Che-LB.tdb | 1849.6 | SI5U3_C32 (x(U) 0.375) + SIU_B27 (x(U) 0.489) + LIQUID (x(U) 0.49278) |
| SiU-04Che-LB.tdb | 1833.55 | SIU_B27 (x(U) 0.489) + LIQUID (x(U) 0.52189) + SI2U3_D5A (x(U) 0.6) |
| SiU-04Che-LB.tdb | 1833.55 | SIU_B27 (x(U) 0.489) + LIQUID (x(U) 0.52179) + SI2U3_D5A (x(U) 0.6) |
| SiU-04Che-LB.tdb | 1833.55 | SIU_B27 (x(U) 0.489) + LIQUID (x(U) 0.52192) + SI2U3_D5A (x(U) 0.6) |
| SiU-04Che-LB.tdb | 1777.15 | LIQUID (x(U) 0.22422) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.34722) |
| SiU-04Che-LB.tdb | 1777.14 | LIQUID (x(U) 0.22393) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.34722) |
| SiU-04Che-LB.tdb | 1777.14 | LIQUID (x(U) 0.22387) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.34722) |
| SiU-04Che-LB.tdb | 1591.92 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.12347) + SI3U_L12 (x(U) 0.25) |
| SiU-04Che-LB.tdb | 1591.92 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.12326) + SI3U_L12 (x(U) 0.25) |
| SiU-04Che-LB.tdb | 1591.92 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.12316) + SI3U_L12 (x(U) 0.25) |
| SiU-04Che-LB.tdb | 1260.64 | SI2U3_D5A (x(U) 0.6) + LIQUID (x(U) 0.88599) + BCC_A2 (x(U) 0.98727) |
| SiU-04Che-LB.tdb | 1260.64 | SI2U3_D5A (x(U) 0.6) + LIQUID (x(U) 0.88614) + BCC_A2 (x(U) 0.98727) |
| SiU-04Che-LB.tdb | 1194.1 | SI2U3_D5A (x(U) 0.6) + SIU3_L12 (x(U) 0.75) + BCC_A2 (x(U) 0.99048) |
| SiU-04Che-LB.tdb | 1194.1 | SI2U3_D5A (x(U) 0.6) + SIU3_L12 (x(U) 0.75) + BCC_A2 (x(U) 0.99047) |
| SiU-04Che-LB.tdb | 1057.52 | SIU3_L12 (x(U) 0.75) + TETRAGONAL_U (x(U) 0.99178) + BCC_A2 (x(U) 0.99576) |
| SiU-04Che-LB.tdb | 1037.98 | SI2U3_D5A (x(U) 0.6) + SIU3_D0C (x(U) 0.75) + SIU3_L12 (x(U) 0.75) |
| SiU-04Che-LB.tdb | 1037.98 | SIU3_D0C (x(U) 0.75) + SIU3_L12 (x(U) 0.75) + TETRAGONAL_U (x(U) 0.99237) |
| SiU-04Che-LB.tdb | 937.94 | SIU3_D0C (x(U) 0.75) + TETRAGONAL_U (x(U) 0.99533) + ORTHORHOMBIC_A20 (x(U) 0.99678) |
| SiU-09Ber.tdb | 1995.22 | LIQUID (x(U) 0.3155) + SI2U_CC (x(U) 0.34722) + SI5U3_C32 (x(U) 0.375) |
| SiU-09Ber.tdb | 1995.21 | LIQUID (x(U) 0.31518) + SI2U_CC (x(U) 0.34722) + SI5U3_C32 (x(U) 0.375) |
| SiU-09Ber.tdb | 1995.21 | LIQUID (x(U) 0.315) + SI2U_CC (x(U) 0.34722) + SI5U3_C32 (x(U) 0.375) |
| SiU-09Ber.tdb | 1851.58 | SI5U3_C32 (x(U) 0.375) + SIU_B27 (x(U) 0.49635) + LIQUID (x(U) 0.49719) |
| SiU-09Ber.tdb | 1851.58 | SI5U3_C32 (x(U) 0.375) + SIU_B27 (x(U) 0.49635) + LIQUID (x(U) 0.49696) |
| SiU-09Ber.tdb | 1837.56 | SIU_B27 (x(U) 0.49635) + LIQUID (x(U) 0.52905) + SI2U3_D5A (x(U) 0.6) |
| SiU-09Ber.tdb | 1837.56 | SIU_B27 (x(U) 0.49635) + LIQUID (x(U) 0.529) + SI2U3_D5A (x(U) 0.6) |
| SiU-09Ber.tdb | 1837.56 | SIU_B27 (x(U) 0.49635) + LIQUID (x(U) 0.52933) + SI2U3_D5A (x(U) 0.6) |
| SiU-09Ber.tdb | 1795.75 | LIQUID (x(U) 0.20713) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.34722) |
| SiU-09Ber.tdb | 1795.75 | LIQUID (x(U) 0.2074) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.34722) |
| SiU-09Ber.tdb | 1795.75 | LIQUID (x(U) 0.20708) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.34722) |
| SiU-09Ber.tdb | 1596.94 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.10631) + SI3U_L12 (x(U) 0.25) |
| SiU-09Ber.tdb | 1596.94 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.10619) + SI3U_L12 (x(U) 0.25) |
| SiU-09Ber.tdb | 1596.94 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.10613) + SI3U_L12 (x(U) 0.25) |
| SiU-09Ber.tdb | 1249.45 | SI2U3_D5A (x(U) 0.6) + LIQUID (x(U) 0.87171) + BCC_A2 (x(U) 0.97214) |
| SiU-09Ber.tdb | 1249.45 | SI2U3_D5A (x(U) 0.6) + LIQUID (x(U) 0.87184) + BCC_A2 (x(U) 0.97217) |
| SiU-09Ber.tdb | 1192.9 | SI2U3_D5A (x(U) 0.6) + SIU3 (x(U) 0.75) + BCC_A2 (x(U) 0.97625) |
| SiU-09Ber.tdb | 1192.9 | SI2U3_D5A (x(U) 0.6) + SIU3 (x(U) 0.75) + BCC_A2 (x(U) 0.97627) |
| SiU-09Ber.tdb | 1052.43 | SIU3 (x(U) 0.75) + TETRAGONAL_U (x(U) 0.98734) + BCC_A2 (x(U) 0.98898) |
| SiU-09Ber.tdb | 920.83 | SIU3 (x(U) 0.75) + TETRAGONAL_U (x(U) 0.99225) + ORTHORHOMBIC_A20 (x(U) 1) |
| SiU-09Ber.tdb | 920.82 | SIU3 (x(U) 0.75) + TETRAGONAL_U (x(U) 0.99229) + ORTHORHOMBIC_A20 (x(U) 1) |
| SiU-98AEA.tdb | 1910.55 | LIQUID (x(U) 0.26656) + SI2U_CC (x(U) 0.33333) + SI5U3_C32 (x(U) 0.375) |
| SiU-98AEA.tdb | 1910.55 | LIQUID (x(U) 0.26649) + SI2U_CC (x(U) 0.33333) + SI5U3_C32 (x(U) 0.375) |
| SiU-98AEA.tdb | 1910.55 | LIQUID (x(U) 0.26666) + SI2U_CC (x(U) 0.33333) + SI5U3_C32 (x(U) 0.375) |
| SiU-98AEA.tdb | 1871.05 | SI5U3_C32 (x(U) 0.375) + SIU_B27 (x(U) 0.5) + LIQUID (x(U) 0.51018) |
| SiU-98AEA.tdb | 1871.05 | SI5U3_C32 (x(U) 0.375) + SIU_B27 (x(U) 0.5) + LIQUID (x(U) 0.51008) |
| SiU-98AEA.tdb | 1870.46 | SIU_B27 (x(U) 0.5) + LIQUID (x(U) 0.51321) + SI2U3_D5A (x(U) 0.6) |
| SiU-98AEA.tdb | 1870.46 | SIU_B27 (x(U) 0.5) + LIQUID (x(U) 0.51331) + SI2U3_D5A (x(U) 0.6) |
| SiU-98AEA.tdb | 1778.47 | LIQUID (x(U) 0.19125) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.33333) |
| SiU-98AEA.tdb | 1778.47 | LIQUID (x(U) 0.1913) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.33333) |
| SiU-98AEA.tdb | 1778.47 | LIQUID (x(U) 0.19122) + SI3U_L12 (x(U) 0.25) + SI2U_CC (x(U) 0.33333) |
| SiU-98AEA.tdb | 1604.82 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.09784) + SI3U_L12 (x(U) 0.25) |
| SiU-98AEA.tdb | 1604.82 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.09776) + SI3U_L12 (x(U) 0.25) |
| SiU-98AEA.tdb | 1604.82 | DIAMOND_A4 (x(U) 0) + LIQUID (x(U) 0.09774) + SI3U_L12 (x(U) 0.25) |
| SiU-98AEA.tdb | 1277 | SI2U3_D5A (x(U) 0.6) + LIQUID (x(U) 0.90816) + BCC_A2 (x(U) 1) |
| SiU-98AEA.tdb | 1205.16 | SI2U3_D5A (x(U) 0.6) + SIU3 (x(U) 0.75) + BCC_A2 (x(U) 1) |
| SiU-98AEA.tdb | 1048.99 | SIU3 (x(U) 0.75) + BCC_A2 (x(U) 1) + TETRAGONAL_U (x(U) 1) |
| SiU-98AEA.tdb | 942.02 | SIU3 (x(U) 0.75) + ORTHORHOMBIC_A20 (x(U) 1) + TETRAGONAL_U (x(U) 1) |
Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull SiU-04Che-LB · CALPHAD hull SiU-98AEA
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.
| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---|---|---|---|---|---|---|---|
| U3Si | SiU3 | -26.02 kJ/mol-atom ± 4.8 | 298.15 | experimental | -21.811 (mp-aaaaabku) | -23.444 (oqmd-1995) | [1] Berche 2009 cites OHare 1975 | Table 2, p. 2, row 22 report | |
| U3Si | SiU3 | -24.93 kJ/mol-atom | 298.15 | model | -21.811 (mp-aaaaabku) | -23.444 (oqmd-1995) | [1] Berche 2009 | Table 2, p. 2, row 24 report | |
| U3Si | SiU3 | -22.99 kJ/mol-atom | 298.15 | model | -21.811 (mp-aaaaabku) | -23.444 (oqmd-1995) | [1] Berche 2009 cites Rand 2009 | Table 2, p. 2, row 23 report | |
| U3Si2 | Si2U3 | -35.95 kJ/mol-atom ± 3.34 | 298.15 | experimental | -10.03 (mp-aaaabfpa) | -14.346 (oqmd-6055) | [1] Berche 2009 cites Alcock 1962 | Table 2, p. 2, row 19 report | |
| U3Si2 | Si2U3 | -34.32 kJ/mol-atom | 298.15 | model | -10.03 (mp-aaaabfpa) | -14.346 (oqmd-6055) | [1] Berche 2009 | Table 2, p. 2, row 21 report | |
| U3Si2 | Si2U3 | -34.11 kJ/mol-atom | 298.15 | model | -10.03 (mp-aaaabfpa) | -14.346 (oqmd-6055) | [1] Berche 2009 cites Rand 2009 | Table 2, p. 2, row 20 report | |
| U3Si2 | Si2U3 | -33.86 kJ/mol-atom ± 0.42 | 298.15 | experimental | -10.03 (mp-aaaabfpa) | -14.346 (oqmd-6055) | [1] Berche 2009 cites Gross 1962 | Table 2, p. 2, row 18 report | |
| U3Si5 | -44.26 kJ/mol-atom | 298.15 | model | [1] Berche 2009 cites Rand 2009 | Table 2, p. 2, row 11 report | ||||
| U3Si5 | -42.9 kJ/mol-atom | 298.15 | model | [1] Berche 2009 | Table 2, p. 2, row 12 report | ||||
| USi | SiU | -43.47 kJ/mol-atom ± 1.67 | 298.15 | experimental | -16.795 (mp-aaaabdeh) | -19.948 (oqmd-6064) | [1] Berche 2009 cites Gross 1962 | Table 2, p. 2, row 14 report | |
| USi | SiU | -42.22 kJ/mol-atom | 298.15 | model | -16.795 (mp-aaaabdeh) | -19.948 (oqmd-6064) | [1] Berche 2009 cites Rand 2009 | Table 2, p. 2, row 16 report | |
| USi | SiU | -41.8 kJ/mol-atom ± 4.18 | 298.15 | experimental | -16.795 (mp-aaaabdeh) | -19.948 (oqmd-6064) | [1] Berche 2009 cites Alcock 1962 | Table 2, p. 2, row 15 report | |
| USi | SiU | -41.18 kJ/mol-atom | 298.15 | model | -16.795 (mp-aaaabdeh) | -19.948 (oqmd-6064) | [1] Berche 2009 | Table 2, p. 2, row 17 report | |
| USi | SiU | -40.13 kJ/mol-atom ± 0.84 | 298.15 | experimental | -16.795 (mp-aaaabdeh) | -19.948 (oqmd-6064) | [1] Berche 2009 cites Gross 1962 | Table 2, p. 2, row 13 report | |
| USi2 | Si2U | -43.89 kJ/mol-atom ± 4.18 | 298.15 | experimental | -27.301 (mp-aaaaabls) | -31.404 (oqmd-670765) | [1] Berche 2009 cites Alcock 1962 | Table 2, p. 2, row 8 report | |
| USi2 | Si2U | -43.47 kJ/mol-atom ± 0.42 | 298.15 | experimental | -27.301 (mp-aaaaabls) | -31.404 (oqmd-670765) | [1] Berche 2009 cites Gross 1962 | Table 2, p. 2, row 6 report | |
| USi2 | Si2U | -43.33 kJ/mol-atom | 298.15 | model | -27.301 (mp-aaaaabls) | -31.404 (oqmd-670765) | [1] Berche 2009 | Table 2, p. 2, row 10 report | |
| USi2 | Si2U | -43.19 kJ/mol-atom | 298.15 | model | -27.301 (mp-aaaaabls) | -31.404 (oqmd-670765) | [1] Berche 2009 cites Rand 2009 | Table 2, p. 2, row 9 report | |
| USi2 | Si2U | -42.64 kJ/mol-atom ± 1.25 | 298.15 | experimental | -27.301 (mp-aaaaabls) | -31.404 (oqmd-670765) | [1] Berche 2009 cites Gross 1962 | Table 2, p. 2, row 7 report | |
| USi3 | Si3U | -35.53 kJ/mol-atom ± 4.18 | 298.15 | experimental | -31.163 (mp-aaaaaeds) | -36.154 (oqmd-18109) | [1] Berche 2009 cites Alcock 1962 | Table 2, p. 2, row 3 report | |
| USi3 | Si3U | -33.02 kJ/mol-atom ± 0.13 | 298.15 | experimental | -31.163 (mp-aaaaaeds) | -36.154 (oqmd-18109) | [1] Berche 2009 cites Gross 1962 | Table 2, p. 2, row 1 report | |
| USi3 | Si3U | -32.9 kJ/mol-atom | 298.15 | model | -31.163 (mp-aaaaaeds) | -36.154 (oqmd-18109) | [1] Berche 2009 | Table 2, p. 2, row 5 report | |
| USi3 | Si3U | -32.6 kJ/mol-atom | 298.15 | model | -31.163 (mp-aaaaaeds) | -36.154 (oqmd-18109) | [1] Berche 2009 cites Rand 2009 | Table 2, p. 2, row 4 report | |
| USi3 | Si3U | -32.19 kJ/mol-atom ± 0.84 | 298.15 | experimental | -31.163 (mp-aaaaaeds) | -36.154 (oqmd-18109) | [1] Berche 2009 cites Gross 1962 | Table 2, p. 2, row 2 report |
Other properties
Phase transition (12)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Phase transition | 1250 K | 1250 | eutectic: 4 at.% Si alloy: Si 0.0397, U 0.9603 | model | [1] Berche 2009 | Table 1, p. 2, row 5 report | |
| Phase transition | 1250 K | 1250 | eutectic: 9 at.% Si alloy: Si 0.0869, U 0.9131 | model | [1] Berche 2009 | Table 1, p. 2, row 11 report | |
| Phase transition | 1258 K | 1258 | eutectic: 4 at.% Si alloy: Si 0.0397, U 0.9603 | experimental | [1] Berche 2009 cites Katz 1951 | Table 1, p. 2, row 3 report | |
| Phase transition | 1258 K | 1258 | eutectic: 9 at.% Si alloy: Si 0.0869, U 0.9131 | experimental | [1] Berche 2009 cites Katz 1951 | Table 1, p. 2, row 9 report | |
| Phase transition | 1261 K | 1261 | eutectic: 9 at.% Si alloy: Si 0.0869, U 0.9131 | experimental | [1] Berche 2009 | Table 1, p. 2, row 10 report | |
| Phase transition | 1267 K | 1267 | eutectic: 4 at.% Si alloy: Si 0.0397, U 0.9603 | experimental | [1] Berche 2009 | Table 1, p. 2, row 4 report | |
| Phase transition | 1405 K | 1405 | congruent transformation: 0 at.% Si alloy: U 0 | experimental | [1] Berche 2009 | Table 1, p. 2, row 2 report | |
| Phase transition | 1408 K | 1408 | congruent transformation: 0 at.% Si alloy: U 0 | experimental | [1] Berche 2009 | Table 1, p. 2, row 1 report | |
| Phase transition | 1783 K | 1783 | peritectic: 75 at.% Si alloy: Si 0.7468, U 0.2532 | experimental | [1] Berche 2009 cites Katz 1951 | Table 1, p. 2, row 17 report | |
| Phase transition | 1813 K | 1813 | eutectic: 46 at.% Si alloy: Si 0.4632, U 0.5368 | experimental | [1] Berche 2009 cites Vaugoyeau 1971 doi | Table 1, p. 2, row 12 report | |
| Phase transition | 1820 K | 1820 | eutectic: 46 at.% Si alloy: Si 0.4632, U 0.5368 | experimental | [1] Berche 2009 | Table 1, p. 2, row 13 report | |
| Phase transition | 1840 K | 1840 | eutectic: 46 at.% Si alloy: Si 0.4632, U 0.5368 | model | [1] Berche 2009 | Table 1, p. 2, row 14 report |
Phase equilibrium (5)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Phase composition | 1340 | other: 4 at.% Si liquid: Si 0.0397, U 0.9603 | experimental | [1] Berche 2009 | Table 1, p. 2, row 7 report | ||
| Phase composition | 1360 | other: 4 at.% Si liquid: Si 0.0397, U 0.9603 | model | [1] Berche 2009 | Table 1, p. 2, row 8 report | ||
| Phase composition | 1363 | other: 4 at.% Si liquid: Si 0.0397, U 0.9603 | experimental | [1] Berche 2009 cites Massalski 1990 | Table 1, p. 2, row 6 report | ||
| Phase composition | 1860 | other: 46 at.% Si liquid: Si 0.4632, U 0.5368 | model | [1] Berche 2009 | Table 1, p. 2, row 16 report | ||
| Phase composition | 1867 | other: 46 at.% Si liquid: Si 0.4632, U 0.5368 | experimental | [1] Berche 2009 | Table 1, p. 2, row 15 report |
Sources
Reporting papers the values were read from (a value cited from another work names that work in its row).
- A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009). doi:10.1016/j.jnucmat.2009.01.014