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Título : Structural and thermal evolution studies of LaSbO4 ceramics prepared by solid-state reaction method.
Autor : Siqueira, Kisla Prislen Félix
Borges, Raquel Moreira
Soares, Júlia Cristina
Dias, Anderson
Palabras clave : Electronic materials
Raman spectroscopy and scattering
Crystal structure
Fecha de publicación : 2013
Citación : SIQUEIRA, K. P. F. et al. Structural and thermal evolution studies of LaSbO4 ceramics prepared by solid-state reaction method. Materials Chemistry and Physics, v. 140, p. 255-259, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0254058413002551>. Acesso em: 02 fev. 2015.
Resumen : This work investigates the thermal evolution of LaSbO4 ceramics produced by solid-state method in the temperature range 700e1500 _C, for 6 h. Besides the expected phase transitions, a thermal decomposition at high temperatures to La3SbO7 was observed and discussed. The results showed that the phase LaSbO4 can be obtained only below 1450 _C, while temperatures lower than 1100 _C are not able to produce crystalline structures. The samples were submitted to X-ray diffraction and Raman scattering measurements aiming to determine their crystal structures. LaSbO4 materials exhibited monoclinic structures, space group P21/m ¼ C2 2h(#11), with Z ¼ 4. It was verified that all the 36 Raman-active modes predicted by group-theory calculations were observed. Also, the symmetries could be discerned by using polarized Raman scattering, which allow us to assign the gerade modes. Luminescence properties of LaSbO4 were investigated and the results showed that this compound exhibits sensitivity of the host lattice to UV excitation. PL spectra excited at 360 nm have a blue emission band maximum at 428 nm, corresponding to the self-activated luminescence center of LaSbO4.
URI : http://www.repositorio.ufop.br/handle/123456789/4859
metadata.dc.identifier.doi: https://doi.org/10.1016/j.matchemphys.2013.03.031
ISSN : 0254-0584
metadata.dc.rights.license: O periódico Materials Chemistry and Physics concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3577130509795.
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