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Raman spectroscopy on cubic and hexagonal SrMnO3

✍ Scribed by A. Sacchetti; M. Baldini; P. Postorino; C. Martin; A. Maignan

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
516 KB
Volume
37
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

We report on the first optical characterization of both cubic and hexagonal SrMnO~3~. Room‐temperature Raman spectra collected by means of a micro‐Raman spectrometer are shown. The spectrum of the cubic compound is characterized by weak and broad bands in agreement with group theory which predicts no Raman‐active phonons for this compound. On the other hand, the spectrum of the hexagonal compound shows six narrow peaks ascribed to one‐phonon processes. A complete polarization analysis of the spectra collected from a single crystallite allows us to completely assign the symmetries of the six observed peaks. Atomic displacements for all phonon peaks are also proposed. Copyright Β© 2006 John Wiley & Sons, Ltd.

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## JNTRODUCTION Faujasi te is a zeolite with widespread industrial applications. The crystal structure of faujasite (structure type FAU) can be described as a cubic close packing of so-called sodalite cages connected by double six-rings of SiOl tetrahedra. The corresponding hexagonal close-packed