Perovskite La1−xSrxGa1−yMnyO3 solid solution crystals: Raman spectroscopy characterization

The first-order orthorhombic–rhombohedral phase transition of La 1− x Sr x Ga 1− y Mn y O 3 (LSGMn) crystals is studied by Raman spectroscopy. An increase in Mn content causes significant changes in Raman spectra, especially in the high-wavenumber spectral range. The Raman spectrum of La 1− x Sr x G...

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Bibliographic Details
Published in:Journal of materials science 2012-07, Vol.47 (14), p.5393-5401
Main Authors: Runka, T., Berkowski, M.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Crystals
Manganese
Materials Science
Phase transformations
Polymer Sciences
Raman spectroscopy
Solid Mechanics
Solid solutions
Spectra
Strontium
Vibration
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Summary:The first-order orthorhombic–rhombohedral phase transition of La 1− x Sr x Ga 1− y Mn y O 3 (LSGMn) crystals is studied by Raman spectroscopy. An increase in Mn content causes significant changes in Raman spectra, especially in the high-wavenumber spectral range. The Raman spectrum of La 1− x Sr x Ga 1− y Mn y O 3 compound with x  =  y  = 0.02 is dominated by MnO 6 internal vibrations. Moreover, a change in the spectrum of this crystal is observed when the 785-nm excitation line is used. Essential reduction in the number of Raman modes during the phase transition is experimentally observed. The temperature of the phase transition decreases with increasing Sr and Mn contents, at the rate of about 20 K/at%.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-6422-2