Ca_0.075Sr_0.925Bi₄Ti₄O₁₅铁电陶瓷的性能  

Properties of the Ca_(0.075)Sr_(0.925)Bi_4Ti_4O_(15) Ferroelectric Ceramics

作　　者：张丰庆[1] 范素华[1] 陈杨[1] 董蓬超[1] 王营营[1] 田清波[1] 

机构地区：[1]山东建筑大学

出　　处：《稀有金属材料与工程》2011年第S1期425-427,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50872075)

摘　　要：用溶胶凝胶法制备了Ca0.075Sr0.925Bi4Ti4O15(简称CSBTi)铁电陶瓷样品,研究了烧结温度对CSBTi铁电陶瓷性能的影响。结果表明:1180℃温度下烧结的CSBTi铁电陶瓷样品的铁电性能得到明显改善,剩余极化强度2Pr为19.4μC/cm2,矫顽场强度Ec为72.5kV/cm;压电常数为d33=9.8pC/N;居里温度TC=543℃,随着测试频率的增加,室温下相对介电常数εr的峰值逐渐下降,而对应的居里温度TC则随之上升,表现出弛豫铁电体的特征。Bismuth-layered compound Ca0.075Sr0.925Bi4Ti4O15 (CSBTi)) ferroelectric ceramic samples were prepared by sol-gel method. Effects of different sintering temperatures on the crystal structure, microstructure and ferroelectric properties of the CSBTi ferroelectric ceramics were studied. It is found that crystals developed entirely and a-axis orientation was enhanced at 1180 ℃. At this sintering temperature, the highest remnant polarization 2Pr and coercive field Ec were 19.4 μC/cm2 and 72.5 kV/cm, respectively. These results can be explained as follows: Bismuth in the pseudo-perovskite blocks evaporated easily at high sintering temperatures that led to oxygen vacancies. The Curie temperature and the piezoelectric constant d33 of the sample were 543 ℃ and 9.8 pC/N, respectively. It is also found that the ceramic samples are relaxor ferroelectricity from the patterns of dielectric constant as a function of frequency.

关 键 词：铁电陶瓷 居里温度 铁电体 

分 类 号：TQ174.1[化学工程—陶瓷工业]