Sn–U system
57 accepted literature values from 2 paper(s) (experimental 32, model 19, unspecified 6); 2 calculated phase diagram(s). 11 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 | 32 |
| model | 19 |
| unspecified | 6 |
| Property group | Values |
|---|---|
| invariant reaction | 38 |
| formation | 17 |
| crystal structure | 2 |
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 |
|---|---|---|---|
| SnU-21Wan.tdb | J. Wang, Y. Yuan, X. Cheng, Q. Zhang, R. Pan, A. Tang, J. Phase Equilib. Diffus., 42, 194-205(2021). doi:10.1007/s11669-021-00872-2 | bfb5a924fae70c95f81592d4e6676e0f3df1ddeb1cc71e68f044d0e330ec6304 | viewer · TDB · JSON |
| SnU-87She.tdb | R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987). doi:10.1007/BF02869271 | 52159592cd32f1c5864a9a901734f19ad59c34b4f1b04b2efb118b8b9f67c388 | viewer · TDB · JSON |
| TDB file | T (K) | Phases at the invariant |
|---|---|---|
| SnU-21Wan.tdb | 1661.44 | LIQUID (x(U) 0.48103) + SNU (x(U) 0.5) + SN4U5 (x(U) 0.55556) |
| SnU-21Wan.tdb | 1661.44 | LIQUID (x(U) 0.48045) + SNU (x(U) 0.5) + SN4U5 (x(U) 0.55556) |
| SnU-21Wan.tdb | 1661.44 | LIQUID (x(U) 0.48124) + SNU (x(U) 0.5) + SN4U5 (x(U) 0.55556) |
| SnU-21Wan.tdb | 1661.44 | LIQUID (x(U) 0.48126) + SNU (x(U) 0.5) + SN4U5 (x(U) 0.55556) |
| SnU-21Wan.tdb | 1627.22 | LIQUID (x(U) 0.27752) + SN2U (x(U) 0.33333) + SNU (x(U) 0.5) |
| SnU-21Wan.tdb | 1627.22 | LIQUID (x(U) 0.27731) + SN2U (x(U) 0.33333) + SNU (x(U) 0.5) |
| SnU-21Wan.tdb | 1627.22 | LIQUID (x(U) 0.27813) + SN2U (x(U) 0.33333) + SNU (x(U) 0.5) |
| SnU-21Wan.tdb | 1627.22 | LIQUID (x(U) 0.27815) + SN2U (x(U) 0.33333) + SNU (x(U) 0.5) |
| SnU-21Wan.tdb | 1627.22 | LIQUID (x(U) 0.27729) + SN2U (x(U) 0.33333) + SNU (x(U) 0.5) |
| SnU-21Wan.tdb | 1615.46 | LIQUID (x(U) 0.22612) + SN7U3 (x(U) 0.3) + SN2U (x(U) 0.33333) |
| SnU-21Wan.tdb | 1615.46 | LIQUID (x(U) 0.22665) + SN7U3 (x(U) 0.3) + SN2U (x(U) 0.33333) |
| SnU-21Wan.tdb | 1615.46 | LIQUID (x(U) 0.22551) + SN7U3 (x(U) 0.3) + SN2U (x(U) 0.33333) |
| SnU-21Wan.tdb | 1615.46 | LIQUID (x(U) 0.22663) + SN7U3 (x(U) 0.3) + SN2U (x(U) 0.33333) |
| SnU-21Wan.tdb | 1615.46 | LIQUID (x(U) 0.22551) + SN7U3 (x(U) 0.3) + SN2U (x(U) 0.33333) |
| SnU-21Wan.tdb | 1604 | LIQUID (x(U) 0.19212) + SN3U_L12 (x(U) 0.25) + SN7U3 (x(U) 0.3) |
| SnU-21Wan.tdb | 1604 | LIQUID (x(U) 0.19174) + SN3U_L12 (x(U) 0.25) + SN7U3 (x(U) 0.3) |
| SnU-21Wan.tdb | 1604 | LIQUID (x(U) 0.19123) + SN3U_L12 (x(U) 0.25) + SN7U3 (x(U) 0.3) |
| SnU-21Wan.tdb | 1604 | LIQUID (x(U) 0.19121) + SN3U_L12 (x(U) 0.25) + SN7U3 (x(U) 0.3) |
| SnU-21Wan.tdb | 1388.3 | SN4U5 (x(U) 0.55556) + LIQUID (x(U) 0.97172) + BCC_A2 (x(U) 0.98014) |
| SnU-21Wan.tdb | 1388.3 | SN4U5 (x(U) 0.55556) + LIQUID (x(U) 0.97193) + BCC_A2 (x(U) 0.98031) |
| SnU-21Wan.tdb | 1048.83 | SN4U5 (x(U) 0.55556) + BCC_A2 (x(U) 0.99991) + TETRAGONAL_U (x(U) 0.99999) |
| SnU-21Wan.tdb | 1048.83 | SN4U5 (x(U) 0.55556) + BCC_A2 (x(U) 0.99991) + TETRAGONAL_U (x(U) 0.99999) |
| SnU-21Wan.tdb | 942.02 | SN4U5 (x(U) 0.55556) + ORTHORHOMBIC_A20 (x(U) 1) + TETRAGONAL_U (x(U) 1) |
| SnU-21Wan.tdb | 505.08 | BCT_A5 (x(U) 0) + LIQUID (x(U) 0) + SN3U_L12 (x(U) 0.25) |
| SnU-87She.tdb | 1619.61 | SN5U3 (x(U) 0.375) + LIQUID (x(U) 0.37751) + SN2U3 (x(U) 0.6) |
| SnU-87She.tdb | 1619.61 | SN5U3 (x(U) 0.375) + LIQUID (x(U) 0.37785) + SN2U3 (x(U) 0.6) |
| SnU-87She.tdb | 1619.61 | SN5U3 (x(U) 0.375) + LIQUID (x(U) 0.37743) + SN2U3 (x(U) 0.6) |
| SnU-87She.tdb | 1603.15 | SN3U_L12 (x(U) 0.25) + LIQUID (x(U) 0.27789) + SN5U3 (x(U) 0.375) |
| SnU-87She.tdb | 1603.15 | SN3U_L12 (x(U) 0.25) + LIQUID (x(U) 0.27786) + SN5U3 (x(U) 0.375) |
| SnU-87She.tdb | 1353.59 | SN2U3 (x(U) 0.6) + LIQUID (x(U) 0.96209) + BCC_A2 (x(U) 0.99073) |
| SnU-87She.tdb | 1353.59 | SN2U3 (x(U) 0.6) + LIQUID (x(U) 0.9621) + BCC_A2 (x(U) 0.99073) |
| SnU-87She.tdb | 1047.33 | SN2U3 (x(U) 0.6) + BCC_A2 (x(U) 0.99914) + TETRAGONAL_U (x(U) 1) |
| SnU-87She.tdb | 1047.33 | SN2U3 (x(U) 0.6) + BCC_A2 (x(U) 0.99914) + TETRAGONAL_U (x(U) 1) |
| SnU-87She.tdb | 942.02 | SN2U3 (x(U) 0.6) + ORTHORHOMBIC_A20 (x(U) 1) + TETRAGONAL_U (x(U) 1) |
| SnU-87She.tdb | 505.08 | BCT_A5 (x(U) 0) + LIQUID (x(U) 0) + SN3U_L12 (x(U) 0.25) |
Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull SnU-87She
Invariant reactions (literature)
| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|
| 1773.15 | congruent melting: L -> Sn2U3 | L: Sn 0.4, U 0.6; Sn2U3: Sn 0.4, U 0.6 | model | [1] Sheldon 1987 | Table 1, p. 2, row 8 report | |
| 1773.15 | congruent melting: L -> Sn2U3 | L: U 0.6; Sn2U3: U 0.6 | model | [1] Sheldon 1987 | Table 1, p. 2, row 7 report | |
| 1666.15 | congruent melting: Liquid->U5Sn4 | Liquid: U 0.556; U5Sn4: U 0.556 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 3 report | |
| 1663.15 | congruent melting: Liquid->U5Sn4 | Liquid: U 0.556; U5Sn4: U 0.556 | model | [2] Wang 2021 | Table 3, p. 7, row 1 report | |
| 1663.15 | congruent melting: Liquid->U5Sn4 | Liquid: U 0.556; U5Sn4: U 0.556 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 2 report | |
| 1661.15 | peritectic: Liquid+U5Sn4->USn | Liquid: U 0.5; U5Sn4: U 0.556; USn: U 0.5 | model | [2] Wang 2021 | Table 3, p. 7, row 4 report | |
| 1658.15 | peritectic: Liquid+U5Sn4->USn | Liquid: U 0.5; U5Sn4: U 0.556; USn: U 0.5 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 5 report | |
| 1655.15 | peritectic: Liquid+U5Sn4->USn | Liquid: U 0.5; U5Sn4: U 0.556; USn: U 0.5 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 6 report | |
| 1653.15 | peritectic: L + Sn2U3 -> Sn5U3 | L: U 0.333; Sn2U3: U 0.6; Sn5U3: U 0.375 | model | [1] Sheldon 1987 | Table 1, p. 2, row 5 report | |
| 1653.15 | peritectic: L + Sn2U3 -> Sn5U3 | L: U 0.338; Sn2U3: U 0.6; Sn5U3: U 0.375 | model | [1] Sheldon 1987 | Table 1, p. 2, row 6 report | |
| 1653.15 | peritectic | experimental | [1] Sheldon 1987 cites ref. 45Tre | p. 3 report | B a s e d on m e t a l l o g r a p h i c a n d t h e r m a l a n a l y s i s data, the composition of t h i s compound was proposed by [45Tre] to be Sn~U3, with a peritectic decomposition a t 1380 ~ | |
| 1633.15 | peritectic: Liquid+USn->USn2 | USn: U 0.5; USn2: U 0.3333 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 8 report | |
| 1633.15 | peritectic: Liquid+USn->USn2 | Liquid: U 0.2903; USn: U 0.5; USn2: U 0.3333 | model | [2] Wang 2021 | Table 3, p. 7, row 7 report | |
| 1633.15 | peritectic: Liquid+USn->USn2 | Liquid: U 0.256; USn: U 0.5; USn2: U 0.3333 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 9 report | |
| 1623.15 | peritectic: Liquid+USn2->U3Sn7 | USn2: U 0.3333; U3Sn7: U 0.3 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 11 report | |
| 1623.15 | peritectic: Liquid+USn2->U3Sn7 | Liquid: U 0.235; USn2: U 0.3333; U3Sn7: U 0.3 | model | [2] Wang 2021 | Table 3, p. 7, row 10 report | |
| 1623.15 | peritectic: L + Sn5U3 -> Sn3U | L: U 0.232; Sn5U3: U 0.375; Sn3U: U 0.25 | model | [1] Sheldon 1987 | Table 1, p. 2, row 3 report | |
| 1623.15 | peritectic: L + Sn5U3 -> Sn3U | L: U 0.244; Sn5U3: U 0.375; Sn3U: U 0.25 | model | [1] Sheldon 1987 | Table 1, p. 2, row 4 report | |
| 1623.15 | peritectic | experimental | [1] Sheldon 1987 cites ref. 45Tre | p. 3 report | [45Tre| reported this compound decomposes peritectically at 1350 ~ | |
| 1623.15 | peritectic: Liquid+USn2->U3Sn7 | Liquid: U 0.221; USn2: U 0.3333; U3Sn7: U 0.3 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 12 report | |
| 1613.15 | peritectic: Liquid+U3Sn7->USn3 | U3Sn7: U 0.3; USn3: U 0.25 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 14 report | |
| 1613.15 | peritectic: Liquid+U3Sn7->USn3 | Liquid: U 0.196; U3Sn7: U 0.3; USn3: U 0.25 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 15 report | |
| 1613.15 | peritectic: Liquid+U3Sn7->USn3 | Liquid: U 0.1982; U3Sn7: U 0.3; USn3: U 0.25 | model | [2] Wang 2021 | Table 3, p. 7, row 13 report | |
| 1408.15 | eutectic: L -> Sn2U3 + γU | L: U 0.999; Sn2U3: U 0.6; γU: U 1 | model | [1] Sheldon 1987 | Table 1, p. 2, row 9 report | |
| 1402.15 | eutectic: Liquid->bcc_A2+U5Sn4 | Liquid: U 0.97; bcc_A2: U 0.984; U5Sn4: U 0.556 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 18 report | |
| 1393.15 | eutectic: Liquid->bcc_A2+U5Sn4 | Liquid: U 0.88; U5Sn4: U 0.556 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 17 report | |
| 1388.15 | eutectic: Liquid->bcc_A2+U5Sn4 | Liquid: U 0.9682; bcc_A2: U 0.9661; U5Sn4: U 0.556 | model | [2] Wang 2021 | Table 3, p. 7, row 16 report | |
| 1354.15 | eutectic: L -> Sn2U3 + γU | L: U 0.97; Sn2U3: U 0.6; γU: U 1 | model | [1] Sheldon 1987 | Table 1, p. 2, row 10 report | |
| 1049.15 | eutectoid: bcc_U->U5Sn4+Tetragonal_U | bcc_U: U 0.9953; U5Sn4: U 0.556; Tetragonal_U: U 0.9954 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 21 report | |
| 1049.15 | eutectoid: bcc_U->U5Sn4+Tetragonal_U | U5Sn4: U 0.556 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 20 report | |
| 1049.15 | eutectoid: bcc_U->U5Sn4+Tetragonal_U | bcc_U: U 0.9999; U5Sn4: U 0.556; Tetragonal_U: U 1 | model | [2] Wang 2021 | Table 3, p. 7, row 19 report | |
| 942.15 | eutectoid: Tetragonal_U+U5Sn4->Orthorhombic_U | Tetragonal_U: U 1; U5Sn4: U 0.556; Orthorhombic_U: U 1 | model | [2] Wang 2021 | Table 3, p. 7, row 22 report | |
| 941.15 | eutectoid: Tetragonal_U+U5Sn4->Orthorhombic_U | Tetragonal_U: U 0.9971; U5Sn4: U 0.556; Orthorhombic_U: U 0.9968 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 24 report | |
| 938.15 | eutectoid: Tetragonal_U+U5Sn4->Orthorhombic_U | U5Sn4: U 0.556 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 23 report | |
| 505.15 | eutectic: Liquid->USn3+bct_Sn | Liquid: U 0; USn3: U 0.25; bct_Sn: U 0 | model | [2] Wang 2021 | Table 3, p. 7, row 25 report | |
| 505.15 | eutectic: Liquid->USn3+bct_Sn | USn3: U 0.25 | experimental | [2] Wang 2021 cites Palenzona 1995 doi | Table 3, p. 7, row 26 report | |
| 505.15 | eutectic: Liquid->USn3+bct_Sn | Liquid: U 0; USn3: U 0.25; bct_Sn: U 0 | experimental | [2] Wang 2021 cites Wang 2016 doi | Table 3, p. 7, row 27 report | |
| 505.15 | other: L -> βSn | L: U 0; βSn: U 0 | model | [1] Sheldon 1987 | Table 1, p. 2, row 1 report |
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 |
|---|---|---|---|---|---|---|---|---|---|
| U3Sn7 | Sn7U3 | -52.78 kJ/mol-atom | 794.15 | unspecified | -12.21 (mp-aaacqpmz) | [2] Wang 2021 cites Palenzona 1995 doi | Table 1, p. 3, row 4 report | ||
| USn | SnU | -88.45 kJ/mol-atom | 794.15 | unspecified | 4.115 (mp-aaacdipr) | -2.203 (oqmd-1231159) | [2] Wang 2021 cites Palenzona 1995 doi | Table 1, p. 3, row 2 report | |
| USn2 | Sn2U | -58.3 kJ/mol-atom | 794.15 | unspecified | -9.73 (mp-aaacqroo) | [2] Wang 2021 cites Palenzona 1995 doi | Table 1, p. 3, row 3 report | ||
| USn3 | Sn3U | -43.47 kJ/mol-atom | 794.15 | experimental | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Colinet 1988 doi | Table 1, p. 3, row 10 report | |
| USn3 | -43.47 kJ/mol (basis unstated) | 794.15 | experimental | [2] Wang 2021 cites Colinet 1988 doi | p. 2 report | Colinet et al.[26] reported the enthalpy of formation of USn3 as - 35.3 kJ mol-1 at 25 C and - 43.47 kJ mol-1 at 521 C characterized by solution calorimetry analysis. | |||
| USn3 | Sn3U | -43.2 kJ/mol-atom | 794.15 | experimental | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Pattanaik 2013 doi | Table 1, p. 3, row 11 report | |
| USn3 | Sn3U | -42.9 kJ/mol-atom | 965.15 | experimental | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Kadochnikov 1976 | Table 1, p. 3, row 12 report | |
| USn3 | -41.8 kJ/mol (basis unstated) | 794.15 | experimental | [2] Wang 2021 cites Johnson 1962 | p. 2 report | Johnson et al.[24] reported the enthalpy of formation of USn3 as - 36.5 kJ mol-1 at 25 C and - 41.8 kJ mol-1 at 521 C using emf measurements. | |||
| USn3 | Sn3U | -41.8 kJ/mol-atom | 794.15 | unspecified | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Sheldon 1987 doi | Table 1, p. 3, row 9 report | |
| USn3 | -36.5 kJ/mol (basis unstated) | 298.15 | experimental | [2] Wang 2021 cites Johnson 1962 | p. 2 report | Johnson et al.[24] reported the enthalpy of formation of USn3 as - 36.5 kJ mol-1 at 25 C and - 41.8 kJ mol-1 at 521 C using emf measurements. | |||
| USn3 | Sn3U | -36.5 kJ/mol-atom | 298.15 | experimental | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Johnson 1962 | Table 1, p. 3, row 6 report | |
| USn3 | -35.3 kJ/mol (basis unstated) | 298.15 | experimental | [2] Wang 2021 cites Colinet 1988 doi | p. 2 report | Colinet et al.[26] reported the enthalpy of formation of USn3 as - 35.3 kJ mol-1 at 25 C and - 43.47 kJ mol-1 at 521 C characterized by solution calorimetry analysis. | |||
| USn3 | Sn3U | -35.3 kJ/mol-atom | 298.15 | experimental | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Colinet 1988 doi | Table 1, p. 3, row 7 report | |
| USn3 | -24.06 kJ/mol (basis unstated) | 794.15 | experimental | [2] Wang 2021 cites Alcock 1962 | p. 2 report | For the thermodynamic properties of U-Sn binary system, Alcock et al.[22] reported the enthalpy of formation of USn3 as - 22.59 kJ mol-1 at 25 C using acid dissociation calorimetry and - 24.06 kJ mol-1 at 521 C using vapor pressure. | |||
| USn3 | Sn3U | -24.06 kJ/mol-atom | 794.15 | experimental | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Alcock 1962 | Table 1, p. 3, row 8 report | |
| USn3 | -22.59 kJ/mol (basis unstated) | 298.15 | experimental | [2] Wang 2021 cites Alcock 1962 | p. 2 report | For the thermodynamic properties of U-Sn binary system, Alcock et al.[22] reported the enthalpy of formation of USn3 as - 22.59 kJ mol-1 at 25 C using acid dissociation calorimetry and - 24.06 kJ mol-1 at 521 C using vapor pressure. | |||
| USn3 | Sn3U | -22.59 kJ/mol-atom | 298.15 | unspecified | -12.058 (mp-aaaabece) | -19.098 (oqmd-18132) | [2] Wang 2021 cites Palenzona 1995 doi | Table 1, p. 3, row 5 report |
Other properties
Crystal structure (2)
| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---|---|---|---|---|---|---|
| Lattice a | 4.6089 Å | 298.15 | Sn3U alloy: Sn 0.75, U 0.25 | model | [1] Sheldon 1987 cites Sari 1983 | Table 3, p. 3, row 9 report | |
| Lattice a | 4.626 Å | 298.15 | Sn3U Sn3U: Sn 0.75, U 0.25 | unspecified | [1] Sheldon 1987 | Table 3, p. 3, row 3 report |
Sources
Reporting papers the values were read from (a value cited from another work names that work in its row).
- R. I. Sheldon, E. M. Foltyn, D. E. Peterson, The Sn-U (Tin-Uranium) system, Bulletin of Alloy Phase Diagrams 8, 347-352 (1987). doi:10.1007/bf02869271
- Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021). doi:10.1007/s11669-021-00872-2