期刊
CERAMICS INTERNATIONAL
卷 30, 期 7, 页码 1175-1179出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2004.03.029
关键词
PLD; ferroelectric; Bi-layered; SBT; SBN; thin film
In this study, we have improved the remanent polarization of SrBi2Ta2O9 (SBT) and SrBi2Nb2O9 (SBN) thin films using Ca substitution at Sr-site. SBT and SBN thin films with different concentrations of Ca were deposited on Pt/TiO2/SiO2/Si substrates using pulsed-laser-deposition technique. The lattice parameters was found to be decreased with Ca incorporation and was attributed to the smaller ionic radii of Ca than for Sr. The modification in lattice vibrational frequencies with the incorporation of Ca in SBT and SBN films was investigated using micro-Raman spectroscopy. The grain size was increased with the increase in the Ca concentrations in SBT and SBN thin films. The SBT thin films with 20% Ca contents exhibited remnant polarization of similar to23.8 muC/cm(2) with a coercive field of similar to175 kV/cm. The remanent polarization was found to be similar to35.5 muC/cm(2) for SBN thin films with 10% Ca incorporation. The dielectric constant of SBT and SBN films was found to be decrease with Ca concentrations and observed to be independent of grain size. (C) 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据