Ferroelectric state analysis in grain boundary of Na0.85Li0.15NbO3 ceramic

被引：138

作者：

Nobre, MAL ^{[1
]}

Lanfredi, S ^{[1
]}

机构：

[1] UNESP, FCT, BR-19060900 Sao Paulo, Brazil

来源：

JOURNAL OF APPLIED PHYSICS | 2003年 / 93卷 / 09期

关键词：

D O I：

10.1063/1.1564281

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electric and dielectric properties of the grain boundary of Na0.85Li0.15NbO3 lead-free ferroelectric-semiconductor perovskite were investigated. The impedance spectroscopy was carried out as a function of a thermal cycle. The sodium lithium niobate was synthesized by a chemical route based on the evaporation method. Dense ceramic, relative density of 97%, was prepared at 1423 K for 2 h in air atmosphere. ac measurements were carried out in the frequency range of 5 Hz-13 MHz and from 673 to 1023 K. Theoretical adjust of the impedance data was performed to deriving the electric parameters of the grain boundary. The electric conductivity follows the Arrhenius law, with activation energy values equal to 1.55 and 1.54 eV for heating and cooling cycle, respectively. The nonferroelectric state of the grain boundary and its correlation with symmetry are discussed in the temperature domain. (C) 2003 American Institute of Physics.

引用

页码：5557 / 5562

页数：6

共 16 条

[1] THE TRANSPORT-PROPERTIES OF POLYCRYSTALLINE NANBO3 DETERMINED FROM IMMITTANCE SPECTRA AT VERY LOW-FREQUENCIES [J].