Publication Date:
2014-01-30
Description:
Powders of U 6 Fe 30 P 19 and U 6 Co 30 P 19 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 U 6 Fe 30 P 19 of a = 14.762(2) Å, c = 3.6315(4) Å, c / a = 0.2460, V = 685.3 Å 3 and for U 6 Co 30 P 19 of a = 14.722(3) Å, c = 3.6355(6) Å, c / a = 0.2469, V = 682.4 Å 3 . Single crystals of U 6 Fe 30 P 19 were synthesized and its structure was determined. U 6 Fe 30 P 19 crystallizes in the space group C 1 , 3 h – P of the hexagonal system in the Yb 6 Co 30 P 19 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) Å 3 . The asymmetric unit of U 6 Fe 30 P 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 Yb 6 Co 30 P 19 structure type is discussed.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
