# The phosphides U6Fe30P19 and U 6Co30P19 with the Yb6Co 30P19 structure type

Mariya S. Tarasenko, Jörg H. Albering, Wolfgang Jeitschko, James A. Ibers

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### Abstract

Powders of U6Fe30P19 and U 6Co30P19 were synthesized through the use of tin fluxes. Examination of these powders at 298 K by the Guinier technique led to lattice parameters in the hexagonal system for U6Fe 30P19 of a = 14.762(2) Å, c = 3.6315(4) Å, c/a = 0.2460, V = 685.3 Å3 and for U6Co 30P19 of a = 14.722(3) Å, c = 3.6355(6) Å, c/a = 0.2469, V = 682.4 Å3. Single crystals of U 6Fe30P19 were synthesized and its structure was determined. U6Fe30P19 crystallizes in the space group C1,3h - P$\bar{6}$ of the hexagonal system in the Yb6Co30P19 structure type with one formula unit in a cell of dimensions determined at 100 K of a = 14.7206(4) Å, c = 3.6243(1) Å, c/a = 0.2462, V = 680.15(4) Å3. The asymmetric unit of U6Fe30P 19 comprises two U, ten Fe, and seven different P atoms. Each U atom is situated in a trigonal prism of six P atoms; each Fe atom is coordinated either by a tetrahedron or a square pyramid of P atoms. The distances are all less than 2.9 Å. In addition, the structure contains numerous Fe-Fe bonds covering the range from 2.55 to 2.71 Å. The proper space group of the Yb6Co30P19 structure type is discussed.

Original language English (US) 1342-1346 5 Zeitschrift fur Anorganische und Allgemeine Chemie 640 7 https://doi.org/10.1002/zaac.201300603 Published - Jun 2014

### Keywords

• Crystal structures
• Solid-state phosphides
• Transition metals
• Uranium

### ASJC Scopus subject areas

• Inorganic Chemistry