Crystal chemistry peculiarities of Cs2Te4O12 |
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| Authors: | David Hamani Olivier Masson Maggy Colas Philippe Thomas |
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| Institution: | a Laboratoire Science des Procédés Céramiques et de Traitements de Surface, UMR 6638 CNRS, Centre Européen de la Céramique, 12 rue Atlantis, 87068 Limoges Cedex, France
b Fock Institute of Physics, Saint-Petersburg State University, 1 Ulyanovskaya street, 198504 Petrodvorets, Russia |
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| Abstract: | The Raman and IR-absorption spectra of the Cs2Te4O12 lattice are first recorded and interpreted. Extraordinary features observed in the structure and Raman spectra of Cs2Te4O12 are analyzed by using ab initio and lattice-dynamical model calculations. This compound is specified as a caesium-tellurium tellurate Cs2TeIV(TeVIO4)3 in which TeIV atoms transfer their 5p electrons to TeVIO4]36− tellurate anions, thus fulfilling (jointly with Cs atoms) the role of cations. The TeVI-O-TeVI bridge vibration Raman intensity is found abnormally weak, which is reproduced by model treatment including the Cs+ ion polarizability properties in consideration. |
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| Keywords: | Raman spectroscopy Lattice dynamics Ab initio Tellurium (IV) oxide Tellurium (VI) oxide |
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