Infrared spectra of pyrogermanates of the rare earth elements and structure of the anion Ge2O7
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A study of the IR spectra of rare earth pyrogermanates permits the establishment of the existence of three structural types of these compounds. The shift of the boundaries of stability of each of the structural types, in comparison with pyrosilicates, is due to an increase in the distance between the oxygen atoms in the germanate tetrahedron.
As we pass from types I to II and III of the rare earth pyrogermanates (i.e., in the series La2Ge2O7 → Lu2Ge2O7), there is an increase in the valence angle GeOGe in the anion Ge2O7, all the way to 180‡ in structures of type III.
Just as in the pyrosilicates, the increase in the angle GeOGe is due to an increase in the order of the Ge-O(Ge) bond with decreasing basicity of the cation.
KeywordsOxygen Oxygen Atom Rare Earth Infrared Spectrum Structural Type
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