Preparação de LiNbO3 e LiNbO3:Eu3+ pelo método dos precursores poliméricos

AUTOR(ES)

Souza, Luciana A., Messaddeq, Younès, Ribeiro, Sidney J. L., Fredericci, Catia, Lanciotti Jr., Francesco, Pizani, Paulo S.

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2002-12

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.

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