摘要
用溶胶-凝胶工艺制备了Pb_(0.95-x)Ca_(0.05)La_xTi_(1-x/4)O_3(X=0.05~0.2)系统的微粉和陶瓷,该材料密度可达理论密度值的90%以上。研究了该陶瓷的物理和电性质,所测得热释电系数p=2.20×10^(-8)~3.17×10^(-8)C/cm~2·K,并具有负温度系数效应。讨论了对应Ti—O_I伸缩振动铁电软模和O_I-Ti-OII、(Pb、Ca、La)-(TiO_3)的弯曲振动红外和远红外吸收光谱。根据陶瓷极化前后XRD谱强度的变化,计算了该陶瓷极化后电畴在空间的择优取向分布。
Ultrafine powder and ceramics of Pb0.95-xCa0.5LaxTi1-x/4O3(X=0.05~ 0.2)system were prepared by sol-gel process.The density of resultant materials is above 90% of the theoretlcal value.The detailed physical and ferroclectric properties of the ceramics were investigated,including pyroelectrie coefficient p=2.20×10-8~3.17×10-8 C/cm2·K and a NTC(Negative Temperature Coefficient) effect. IR and FIR absorption band referred to the ferroelectric soft mode of Ti-O1 stretching and O1-Ti-O11、(Pb、Ca、La)-(TiO3)bending vibration have been discussed.The space orientation distribution of the domains in polarized ceamic was calculated according to XRD spectra intensity variation before and after polarization of PCLT ceramics.
出处
《华东理工大学学报(自然科学版)》
CAS
CSCD
1996年第4期433-438,共6页
Journal of East China University of Science and Technology
基金
国家教委博士点基金
关键词
溶胶-凝胶法
工艺
铁电性质
钛酸铅
铁电陶瓷
sol-gel process
ceramics
ultrafine powder
ferroelectric properties.