Infrared and complex dielectric function studies of LiNbO3 in niobate glass-ceramics

被引：12

作者：

Almeida E.F.D. ^{[1
]}

Paiva J.A.C.D. ^{[1
]}

Sombra A.S.B. ^{[1
]}

机构：

[1] Laboratório de Óptica Não-Linear e Ciência dos Materiais (LONLCM), Departamento de Física, Universidade Federal do Ceará, Fortaleza-Ceará, 60451-970

来源：

Journal of Materials Science | 2000年 / 35卷 / 06期

关键词：

This work was partly sponsored by FINEP; FUNCAP; CNPq (Brazilian agencies);

D O I：

10.1023/A:1004765920995

中图分类号：

学科分类号：

摘要：

Niobate glasses and ceramics [(x Nb2O5 (0.5-x) P2O5) 0.5 Li2O] were prepared by the melt-quenching method and analyzed by means of infrared spectroscopy, X-ray powder diffraction and complex impedance methods. LiNbO3 crystals were detected for high niobium content samples. The study of the complex dielectric function of the LiNbO3 ceramics revealed a very broad acoustic resonance mode around 3 MHz. This resonance was associated to the thickness mode of the LiNbO3 plate ceramic resonator. Electrical poling was performed at 300 °C for 6 hours under an applied dc potential of 1 kV. Strong changes were observed on the complex dielectric function of the niobate ceramic after the poling. The study of the properties of these ferroelectric ceramics is important in view of possible applications in ultrasonic devices such as delay lines and transducers.

引用

页码：1555 / 1559

页数：4

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