Raman and infrared spectroscopy of Sr2B'UO6 (B' = Ni; Co) double perovskites
A. F. L. Moreira, A. F. García-Flores, E. Granado, N. E. Massa, R. M. Pinacca, J. C. Pedregosa, R. E. Carbonio, A. Muñoz, M. J. Martínez-Lope, J. A. Alonso, L. del Campo, D. De Sousa Meneses, P. Echegut
ARTIGO
Inglês
Este artigo foi apresentado no evento 1st Brazilian Meeting on Raman Spectroscopy, 2009
Agradecimentos: This work was supported by Fapesp, CNPq, and CAPES, Brazil. LNLS is acknowledged for the concession of beamtime. N.E.M. acknowledges a sustenance grant by the Université d’Orléans, and partial funding from the Argentinean National Research Council (CONICET)-Project No. PIP 5152/06....
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Agradecimentos: This work was supported by Fapesp, CNPq, and CAPES, Brazil. LNLS is acknowledged for the concession of beamtime. N.E.M. acknowledges a sustenance grant by the Université d’Orléans, and partial funding from the Argentinean National Research Council (CONICET)-Project No. PIP 5152/06. J.C.P is member of CONICET
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Abstract: Temperature dependent normal modes and lattice thermal expansion of Sr2B'UO6 (B' = Ni, Co) double perovskites were investigated by Raman/infrared spectroscopies and synchrotron X-ray diffraction, respectively. Monoclinic crystal structures with space group P2(1)/n were confirmed for both...
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Abstract: Temperature dependent normal modes and lattice thermal expansion of Sr2B'UO6 (B' = Ni, Co) double perovskites were investigated by Raman/infrared spectroscopies and synchrotron X-ray diffraction, respectively. Monoclinic crystal structures with space group P2(1)/n were confirmed for both compounds, with no clear structural phase transition between 10 and 400 K. As predicted for this structure, the first-order Raman and infrared spectra show a plethora of active modes. In addition, the Raman spectra reveal an enhancement of the integrated area of an oxygen stretching mode, which is also observed in higher-order Raman modes, and an anomalous softening of similar to 1 cm(-1) upon cooling below T*similar to 300 K. In contrast, the infrared spectra show conventional temperature dependence. The band profile phonon anomalies are possibly related to an unspecified electronic property of Sr2B'UO6 (B'=Ni, Co)
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FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
Fechado
Raman and infrared spectroscopy of Sr2B'UO6 (B' = Ni; Co) double perovskites
A. F. L. Moreira, A. F. García-Flores, E. Granado, N. E. Massa, R. M. Pinacca, J. C. Pedregosa, R. E. Carbonio, A. Muñoz, M. J. Martínez-Lope, J. A. Alonso, L. del Campo, D. De Sousa Meneses, P. Echegut
Raman and infrared spectroscopy of Sr2B'UO6 (B' = Ni; Co) double perovskites
A. F. L. Moreira, A. F. García-Flores, E. Granado, N. E. Massa, R. M. Pinacca, J. C. Pedregosa, R. E. Carbonio, A. Muñoz, M. J. Martínez-Lope, J. A. Alonso, L. del Campo, D. De Sousa Meneses, P. Echegut
Fontes
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Vibrational Spectroscopy Vol. 54, n. 2 (Nov., 2010), nesp., p. 142-147 |