Raman investigation of A2CoBO6 (A=Sr and Ca, B=Te and W) double perovskites

Raman scattering is used to investigate the room temperature phonons of tetragonal (I4∕m) Sr2CoWO6 and monoclinic (P21∕n) Ca2CoWO6, Sr2CoTeO6, and Ca2CoTeO6 double perovskites. Both tetragonal and monoclinic structures result from small distortions of the Fm3¯m cubic lattice. Therefore, phonons were...

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Bibliographic Details
Published in:Journal of applied physics 2007-06, Vol.101 (12)
Main Authors: Ayala, A. P., Guedes, I., Silva, E. N., Augsburger, M. S., del C. Viola, M., Pedregosa, J. C.
Format: Article
Language:English
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Summary:Raman scattering is used to investigate the room temperature phonons of tetragonal (I4∕m) Sr2CoWO6 and monoclinic (P21∕n) Ca2CoWO6, Sr2CoTeO6, and Ca2CoTeO6 double perovskites. Both tetragonal and monoclinic structures result from small distortions of the Fm3¯m cubic lattice. Therefore, phonons were assigned according to correlations with those observed in the prototype A2B′B″O6 Fm3¯m cubic structure and the internal vibrational modes of the oxygen octahedra. The observed shifts of some vibrations in the A2CoBO6 compounds upon changing either A or B elements are tentatively explained.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2745088