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|Type:||Artigo de periódico|
|Title:||Effects Of Cation Vacancies In The Phonon Raman Spectra Of Lamno3|
|Abstract:||Raman spectra of La1-xMn1-xO3 (x = 0, 0.01, 0.017, 0.022, and 0.035) and La0.91-δMn1-δO3 polycrystalline samples, taken at T = 10 K and room temperature, are presented. All La1-xMn1-xO3 samples show at T = 10 K the presence of modes at about 480 and 610 cm-1, including the rhombohedral and quasi-cubic orthorhombic samples. However, the Raman spectrum of the rhombohedral La0.91-δMn1-δO3 sample does not show these modes at T = 10 K, but presents weak and broad structures at T = 295 K. These results are discussed in terms of local structural distortions associated with Mn vacancies and/or carrier localization in manganese perovskites.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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