【摘要】 用溶胶凝胶法制备了CaxSr1-xBi4Ti4O15(CxS1-xBT)铁电陶瓷前躯体粉体,利用差热分析、X射线衍射分析,确定了该体系的烧结温度和样品的相结构,测试了电学性能。较系统地研究了不同组分对居里温度、铁电性能的影响及相关机理,结果表明,当x=0.6时,CxS1-xBT铁电陶瓷的铁电性良好,剩余极化强度Pr=8.2μC/cm2,矫顽场强Ec=57kV/cm,居里温度为670℃,样品性能的改善与离子极化率、晶格畸变等因素有密切关系。更多还原

【Abstract】 CaxSr1-xBi4Ti4O15(CxS1-xBT) ferroelectric ceramic powders with x ranging from 0 to 1.0 were prepared by sol-gel method,DTA-TG was used to analyze the characteristics of powders and the chemical and physical changes during sintering process.The crystal structure and electrical properties of the CxS1-xBT ferroelectric ceramics were studied.The CxS1-xBT ferroelectric ceramics sintered at 1150℃ exhibited single-phase perovskite structure.The amount of doped Ca in the ceramics had a great influence on the ferroelectric property.The results of the analysis indicated that Ca0.6Sr0.4Bi4Ti4O15 remnant polarization and coercive field were 8.2 μC/cm2 and 57 kV/cm,respectively.The highest Curie temperature was 670℃.That can be attributed to the effects of ionic polarizability and structure distortion.更多还原