Ca_(0.075)Sr_(0.925)Bi_4Ti_4O_(15)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,山东济南250101

出　　处：《稀有金属材料与工程》2011年第S1期387-390,共4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 Ca0.15Sr1.85Bi3.95Nd0.05Ti5O18 (CSBNTi-0.05) ferroelectric ceramic samples were prepared by solid-state reaction method. Effect of different sintering temperatures on the crystal structure, microstructure and ferroelectric properties of the CSBNTi-0.05 ferroelectric ceramics were studied. It is found that crystals develop entirely and a-axis orientation is enhanced at 1180 ℃. At this sintering temperature, the highest remnant polarization 2Pr and coercive field Ec are 18.64 μC/cm2 and 83.2 kV/cm, respectively. These results can be explained as follows. Bismuth in the pseudo-perovskite blocks evaporates easily at high sintering temperatures that leads to oxygen vacancies. The Curie temperature of the sample is 310 ℃. The dielectric constant and dielectric loss of CSBNTi-0.05 is 164 and 0.0083 measured at 60 Hz-100 kHz, respectively.

关 键 词：铁电陶瓷 烧结温度 电学性能 

分 类 号：TQ174.1[化学工程—陶瓷工业]