Actinoid transition metal phosphides An2T12P7 (An = Th, U; T = Fe, Co, Ni) and arsenides An2T12As7 (An = Th, U; T = Co, Ni) with Zr2Fe12P7 type structure.

The preparation and the lattice parameters for the ten title compounds with Zr(2)Fe(12)P(7) type structure are reported; six of them for the first time. The crystal structures of the phosphides Th(2)Fe(12)P(7) (a = 917.3(1) pm, c = 372.