Four compounds in the hexafluoroniobates IV series MNbF6 (M = Ca, Mg,
Cd, Zn) have been synthesized by solid-state reactions. CaNbF6, MgNbF6
, and the ''high temperature'' form of CdNbF6 are isostructural with f
.c. cubic NaSbF6 (space group Fm3m). ZnNbF6 and the room temperature f
orm of CdNbF6 are isostructural with rhombohedral LiSbF6 (space group
<R(3)over bar>). Syntheses and powder diffraction data are reported. (
C) 1998 International Centre for Diffraction Data. [S0885-7156(98)0080
1-X]