Crystal chemistry peculiarities of Cs{sub 2}Te{sub 4}O{sub 12}

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.01.027· OSTI ID:21504057

Hamani, David; Mirgorodsky, Andrei; Masson, Olivier; Merle-Mejean, Therese; Colas, Maggy ^[1]; Smirnov, Mikhael ^[2]; Thomas, Philippe ^[1]

---

1. Laboratoire Science des Procedes Ceramiques et de Traitements de Surface, UMR 6638 CNRS, Centre Europeen de la Ceramique, 12 rue Atlantis, 87068 Limoges Cedex (France)
2. Fock Institute of Physics, Saint-Petersburg State University, 1 Ulyanovskaya street, 198504 Petrodvorets (Russian Federation)

The Raman and IR-absorption spectra of the Cs{sub 2}Te{sub 4}O{sub 12} lattice are first recorded and interpreted. Extraordinary features observed in the structure and Raman spectra of Cs{sub 2}Te{sub 4}O{sub 12} are analyzed by using ab initio and lattice-dynamical model calculations. This compound is specified as a caesium-tellurium tellurate Cs{sub 2}Te{sup IV}(Te{sup VI}O{sub 4}){sub 3} in which Te{sup IV} atoms transfer their 5p electrons to [Te{sup VI}O{sub 4}]{sub 3}{sup 6-} tellurate anions, thus fulfilling (jointly with Cs atoms) the role of cations. The Te{sup VI}-O-Te{sup VI} bridge vibration Raman intensity is found abnormally weak, which is reproduced by model treatment including the Cs{sup +} ion polarizability properties in consideration. -- Graphical abstract: Two versions of the BPM estimations of the Raman intensity for the Cs{sub 2}Te{sub 4}O{sub 12} lattice vibrations: (a) without including effects of the Cs-O bonds and (b) including the above mentioned effects. Experimentally observed peaks are characterized by their frequency positions. Display Omitted Research highlights: > Extraordinary features observed in the structure and Raman spectra of Cs{sub 2}Te{sub 4}O{sub 12}. > Ab initio and lattice-dynamical model calculations. > Abnormally weak Raman intensities of the symmetric Te{sup VI}-O-Te{sup VI} bridge. > The monovalent Cs{sup +} cations profoundly influence the polarizability properties.

• OSTI ID: 21504057
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 3; Other Information: DOI: 10.1016/j.jssc.2011.01.027; PII: S0022-4596(11)00028-4; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTRA
ANIONS
CATIONS
CESIUM COMPOUNDS
CESIUM IONS
CRYSTALS
ELECTRONS
LATTICE VIBRATIONS
POLARIZABILITY
RAMAN SPECTRA
RAMAN SPECTROSCOPY
TELLURATES
TELLURIUM OXIDES
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
FERMIONS
IONS
LASER SPECTROSCOPY
LEPTONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPECTRA
SPECTROSCOPY
TELLURIUM COMPOUNDS