Infrared spectra of pyrogermanates of the rare earth elements and structure of the anion Ge2O7
- 42 Downloads
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
Unable to display preview. Download preview PDF.
- 1.A. N. Lazarev and T. F. Tenisheva, Izv. AN SSSR, Otd. Khim. N., 964, (1961).Google Scholar
- 2.A. N. Lazarev, T. F. Tenisheva, I. A. Bondar', and L. N. Koroleva, Izv. AN SSSR, Otd. Khim. N., 557 (1962).Google Scholar
- 3.A. N. Lazarev and T. F. Tenisheva, Transactions of the Sixth Conference on Experimental and Technical Minerology and Petrography [in Russian], Izv. AN SSSR, Moscow, (1962), p. 319.Google Scholar
- 4.T. F. Tenisheva, A. N. Lazarev, and T. M. Pavlyukevich, Izv. AN SSSR, Otd. Khim. N., 1553 (1965).Google Scholar
- 5.R. C. Haiford, J. Chem. Phys.14, 8 (1946).Google Scholar
- 6.H. Winston and R. S. Halford, J. Chem. Phys.17, 607 (1949).Google Scholar
- 7.F. Liebau, Acta crystallogr.14, 1103 (1961).Google Scholar
- 8.D. W. J. Cruickshank, H. Linton, and G. A. Barclay, Acta crystallogr. 15, 491 (1962).Google Scholar
- 9.A. N. Lazarev and T. F. Tenisheva, Izv. AN SSSR, Ser. Khim., 242 (1964).Google Scholar
- 10.A. N. Lazarev and T. F. Tenisheva, Izv. AN SSSR, Ser. Khim., 403 (1964).Google Scholar
- 11.L. Pauling, The Nature of the Chemical Bond. 3rd edition. Cornell University Press (1960).Google Scholar