摘要
采用复合溶胶凝胶法制粉技术结合传统陶瓷制备工艺,制备了(1-x)BaTiO_3-xKNbO_3陶瓷,对其晶相特征、介电及压电铁电性能进行了研究。在1250℃下烧结的陶瓷形成了单一相的钙钛矿结构固熔体。介电常数随着KNbO_3含量的增加先减小后增加,KNbO_3的加入降低了陶瓷的介电损耗。样品的居里温度也在120℃之间波动。KNbO_3的加入使样品的压电常数d_33值逐渐减小。样品BT的d_33值最大,为140pC/N。样品的剩余极化强度(Pr)随着KNbO_3含量的增加而减小,由7μC/cm^2降为3μC/cm^2;矫顽场强(EC)随KNbO_3含量的增加呈现出变小的趋势,样品BT-KN10的矫顽场强(E_C)为4kV/cm。
（1-x）BaTiO3-xKNbO3 ceramics were tabncated trom the powders prepared by a novel sol-gel method. The crystal structure was investigated by X-ray diffraction. The dielectric , piezoelectric and ferroelectric properties were also studied. The ceramics sintered at 1 250 ℃ were of pure perovskite structure. The dielectric,piezoelectric and ferroeleetric properties of the ceramics were irdluenced obviously lay KNbO3 addition.The Curie temperature of the samples were all about 120 ℃. The biggest piezoelectric constant, d33, of the Sample BT, was 140 pC/N. The remanent polarization Pr decreased with the addition of KNbO3 which was from 7 μ/cm^2 to 3 μ/cm^2. The value of coercive field Ec had the same change direction with the remanent polarization. The lowest value of coercive field Ec was 4 kV/cm.
出处
《江苏陶瓷》
CAS
2007年第1期9-11,17,共4页
Jiangsu Ceramics
关键词
钛酸钡
铌酸钾
介电性能
压电性能
Barium titanate, potassium niobate, dielectric properties, piezoelectric properties
