PREPARATION AND STRUCTURAL INVESTIGATIONS OF ANTIMONIDES WITH THE LaFe4P12 STRUCTURE.

Article abstract of DOI:10.1016/0022-5088(80)90260-X

Fourteen compounds LnT//4Sb//1//2 (Ln EQUVLNT La, Ce, Pr, Nd, Sm, Eu; T EQUVLNT Fe, Ru, Os) were prepared for the first time. Their isotypy with LaFe//4P//1//2 (filled CoAs//3 structure) is shown by their X-ray powder patterns. LaFe//4Sb//1//2 and CeFe//4Sb//1//2 show metallic conductivity. The crystal structure of LaFe//4Sb//1//2 was refined from single-crystal counter data to a residual value of 0. 046 for 389 independent structure factors. A comparison of the structural data for LaFe//4Sb//1//2 with those for the previously determined LaFe//4P//1//2 and LaFe//4As//1//2 structures shows systematic trends in the positional and thermal parameters. The thermal amplitudes of the lanthanum atoms are highest in LaFe//4Sb//1//2.