Bi_2O_3-ZnO-Nb_2O_5系陶瓷介电常数及温度系数的优化

Optimization of Dielectric Constant and Temperature Coefficient of BZN-Based Ceramics

研究了Bi2 O3 ZnO Nb2 O5 (BZN)系复相区陶瓷介电常数的温度稳定性及其温度系数的优化 .讨论了不同的预烧工艺以及掺杂不同晶型的TiO2 对所得BZN系陶瓷的相组成以及介电性能的影响 .结果表明 ,预烧工艺中合理的预烧升温速率的选择 ,对其介电常数的温度稳定性有决定性影响 ,锐钛型TiO2 的掺杂可优化温度系数 ,得到介电性能优异的BZN陶瓷 .

The optimization of dielectric constant and temperature coefficient of BZN based ceramics was investigated. Ceramic samples were prepared by conventional processing technology.The effect of different presintering techniques for BZN based ceramics doped with titania on its phase composition and dielectric properties is discussed. By properly choosing the presintering temperature raising rate, the temperature stability of the dielectric constant can be optimized; and the anatase titania doping can optimize the temperature coefficient. The anatase titania doped BZN compositions with diphasic pyrochlore structures have excellent dielectric properties and high dielectric constants with stable temperature dependence.