Abstract
The infrared spectrum (1400–70 cm −1 ) of orthogermanates and of some orthosilicates of tetravalent elements (Zr, Hf, Th, U, Ce) has been investigated. A fairly detailed assignment has been deduced from both group-theoretical considerations, and relationships between the observed frequencies and, either the mass, or the ionic radius of the tetravalent cations. Some correlations between the bending frequencies, the D 2 d local symmetry of the anion and the ionic radius of the cation are also discussed.
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