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

Química Nova

Luciana A. Souza²  Younès Messaddeq²  Sidney J. L. Ribeiro²  Catia Fredericci¹  Francesco Lanciotti Jr.¹  Paulo S. Pizani¹ 

[1] ,Universidade Estadual Paulista Instituto de Química Araraquara SP

关键词: Pechini method;    lithium niobate;    europium luminescence;   

DOI  :  10.1590/S0100-40422002000700004

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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