Abstract
Crystals of caesium and rubidium difluorophosphates are orthorhombic, with a= 8·437, b= 6·796, c= 8·06 A for the Cs salt, and a= 8·15, b= 6·45, c= 7·79 A for the Rb salt, Z= 4, space-group Pnma. The structure of CsPO2F2 was determined by use of three-dimensional Mo-Kα scintillation counter data by comparison with potassium difluorophosphate, and refined by least-squares methods, the final R being 0·070 for 506 observed reflexions.Potassium, rubidium, and caesium difluorophosphates are isomorphous, and have the barium sulphate structure. The lattice parameters and interionic distances increase with increasing radius of the alkali-metal ion.
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