Crystal structures of AgAF6 (A = P, As, Sb, Nb, Ta) at ambient temperatures

Structures of AgAF6 (A=Sb, Ta) have been determined by X-ray single crystal studies at ambient temperatures. AgSbF6 crystallizes in space group Ia3̄ with a=979.85(4) pm, V=9.4076(12)×108 pm3, z=8, and AgTaF6 crystallizes in space group P42/mcm with a=499.49(4) pm, c=960.51(8) pm, V=2.3964(6)×108 pm3, z=2. Only the crystal system and cell parameters were obtained for the isomorphic AgNbF6; primitive tetragonal, a=497.80(10) pm, b=960.40(10) pm, V=2.3799(12)×108 pm3, z=2. The results of the Raman spectroscopy of AgAF6 support the obtained structures. The structures are discussed by comparing with that of AgPF6 and AgAsF6 which have recently been determined in a series of our study.