Artigo
Preparação de LiNbO3 e LiNbO3:Eu3+ pelo método dos precursores poliméricos
Fecha
2002-12-01Registro en:
Química Nova. Sociedade Brasileira de Química, v. 25, n. 6b, p. 1067-1073, 2002.
0100-4042
10.1590/S0100-40422002000700004
S0100-40422002000700004
S0100-40422002000700004.pdf
2998503841917815
6446047463034654
0000-0003-3286-9440
Autor
Universidade Estadual Paulista (Unesp)
Universidade Federal de São Carlos (UFSCar)
Resumen
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.