摘要
用溶胶-凝胶法制备出Sr_2Bi_5FeTi5O_(21)(SBFTi)铁电陶瓷,用FT-IR和DSC-TG分析前驱体凝胶和粉体随温度的变化。结果表明。SBFTi陶瓷的合成温度在721℃左右,粉体的预烧温度为600℃。XRD结果表明烧结后的陶瓷样品呈现钙钛矿结构,由于BiFeO_3(BFO)的加入使SBFTi与Sr_2Bi_4Ti_5O_(18)(SBTi)相比发生晶格畸变,晶面间距增大。SBFTi陶瓷样品铁电性能较好,在125 kV/cm电场强度下剩余极化强度2Pr和矫顽场强2Ec分别为20.5μC/cm^2和128kV/cm,其铁电性能优于SBTi铁电陶瓷。
A sol-gel method was used in synthesizing Sr_2Bi_5FeTi_5O_(21)(SBFTi) ferroelectric ceramic. Analyses of changes in precursor gels and powders by FT-IR spectrum and DSC-TG show that the SBFTi ceramic is synthesized at about 721 oC and the optimal pre-calcination temperature for powders is 600 oC. The XRD results indicate that sintered ceramic samples present bismuth layer-structured perovskite structure and the main crystal phase of SBFTi is Sr_2Bi_4Ti_5O_(18)(SBTi) with lattice distortion, which result from the addition of Bi FeO_3(BFO). Besides, it is also found that the polycrystalline SBFTi ceramic exhibits good ferroelectric properties. The values of remnant polarization(2Pr) and coercive electric field(2Ec) are 20.5 μC/cm^2 and 128 kV/cm at an applied electric field of 125 kV/cm, respectively, which are better than those of the SBTi ceramic.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第S1期5-8,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50872075
51272142)
