UPt3

Uranium platinum
Names
Other names
Platinum--uranium (3/1)
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/3Pt.U
    Key: YYBWTXHBZRZQRM-UHFFFAOYSA-N
  • [Pt].[Pt].[Pt].[U]
Properties
UPt3
Molar mass 823.3 g/mol
Density 19.3 g/cm3
Melting point 1700°C
Structure
see text
P63/mmc
Thermochemistry
−111 J·mol−1·K−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

UPt3 is an inorganic binary intermetallic crystalline compound of platinum and uranium.

Production

It can be synthesised as an intermetallic compound, by direct fusion of pure components at 1700 °C according to stoichiometric calculations:

3 Pt + U → UPt3

It can also be synthesised by reduction of uranium dioxide with hydrogen in the presence of platinum at 1700 °C:

UO2 + 2 H2 + 3 Pt → UPt3 + 2 H2O

Physical properties

UPt3 forms crystals of hexagonal symmetry (some studies hypothesize a trigonal structure instead), space group P63/mmc, cell parameters a = 0.5766 nm and c = 0.4898 nm (c should be understood as distance from planes), with a structure similar to nisnite (Ni3Sn) and MgCd3.

The compound congruently melts at 1700 °C. The enthalpy of formation of the compound is -111 kJ/mol.

At temperatures below 1 K it becomes superconducting. Due to the large effective mass of the conduction electrons, UPt3 is classed as a Heavy fermion superconductor.

References

  1. 1 2 PubChem. "Platinum--uranium (3/1)". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-10-18.
  2. 1 2 Lyakishev, N.P., ed. (2001). Диаграммы состояния двойных металлических систем [State diagrams of binary metal systems]. Mechanical Engineering (in Russian). Vol. 3, book 3. Moscow. p. 448. ISBN 5-217-02932-3.{{cite book}}: CS1 maint: location missing publisher (link)
  3. 1 2 3 4 Kleykamp, Heiko (1991). "Thermodynamics of the uranium-platinum metals systems" (PDF). Pure and Applied Chemistry. Vol. 63, no. 10. pp. 1401–1408. doi:10.1351/pac199163101401. Archived from the original on 14 February 2015. Retrieved 2022-10-17.
  4. ↑ Walko, D. A.; Hong, J.-I.; Chandrasekhar Rao, T. V. (2001-01-16). "Crystal structure assignment for the heavy-fermion superconductor UPt3". Physical Review B. Vol. 63, no. 5. doi:10.1103/PhysRevB.63.054522. Retrieved 2022-10-18.
  5. ↑ Sumita, Shuntaro; Yanase, Youichi (2018-04-13). "Unconventional superconducting gap structure protected by space group symmetry". Physical Review B. 97 (13) 134512. arXiv:1801.03293. Bibcode:2018PhRvB..97m4512S. doi:10.1103/PhysRevB.97.134512. S2CID 119100443.
  6. ↑ Predel (1998). "Pt-U (Platinum-Uranium)". Ni-Np – Pt-Zr. Landolt-Börnstein - Group IV Physical Chemistry. Springer-Verlag. pp. 1–2. doi:10.1007/10542753_2536. ISBN 3-540-61712-4.
  7. ↑ Ross, B. A. S.; Peterson, D. E. (1990-06-01). "The Pt-U (Platinum-Uranium) system". Bulletin of Alloy Phase Diagrams. Vol. 11, no. 3. pp. 240–243. doi:10.1007/BF03029291.
  8. ↑ Gurtovoy, К. G.; Levitin, R. Z. (October 1987). "Магнетизм актинидов и их соединений" [Magnetism of actinides and their compounds] (PDF). Успехи физических наук (Advances in the Physical Sciences). Vol. 153, no. 2. Retrieved 2022-10-09.
  9. ↑ Mineev, V. P. (1994). "Superconductivity in UPt3". Annales de Physique. Vol. 19, no. 4. pp. 367–384. doi:10.1051/anphys:01994001904036700. Retrieved 2022-10-09.