Preparação de LiNbO3 e LiNbO3:Eu3+ pelo método dos precursores poliméricos
Data
2002-12-01
Autores
Souza, Luciana A. [UNESP]
Messaddeq, Younes [UNESP]
Ribeiro, Sidney José Lima [UNESP]
Fredericci, Catia
Lanciotti Jr., Francesco
Pizani, Paulo S.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Química
Resumo
The ferroelectric compound LiNbO3 was prepared by the polymeric precursors method in the polycrystalline form containing different concentrations of Eu3+. The compounds were characterized by X-ray diffraction, vibrational and electronic spectroscopy. Electronic spectroscopy was shown to be sensitive to small concentrations of contaminating phases allowing a good control of the compound purity. The presence of Eu3+ ions leads to the formation of the LiNb3O8 phase in the range of 500 to 800 °C. Above this temperature range LiNbO3 and tetragonal (T') EuNbO4 were obtained.
Descrição
Palavras-chave
Pechini method, lithium niobate, europium luminescence
Como citar
Química Nova. Sociedade Brasileira de Química, v. 25, n. 6b, p. 1067-1073, 2002.