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11 October 2010 Raman shift of rare earth cobalt oxides
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RCoO3(R=La, Ce, Pr, Nd, Sm, Eu, Gd and Dy) perovskites prepared using the solid-state reaction method were examined by Raman spectroscopy. The Raman active Phonons in the RCoO3 perovskites crystallized in cubic symmetry for RCoO3 (R=La, Ce, Pr and Nd) and orthorhombic symmetry for RCoO3 (R=Sm, Eu, Gd, and Dy) were reported. The Raman spectra of RCoO3 perovskites were strongly dependent on the ionic radius of the rare earth elements, and the frequency shift of the most intense modes of the orthorhombic samples were correlated with some structural parameters such as Co-O bond distances, ionic radius of the rare earth elements and John-Teller distortion. It is clear that Raman spectroscopy has the advantage of being very sensitive to structure distortion and oxygen motion.
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Weiran Wang, Yan Zhao, and Xueying Han "Raman shift of rare earth cobalt oxides", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76563X (11 October 2010);

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