铅欠缺对PZN基陶瓷有序微区、介电和电致应变性能的影响

The Effect of Lead Deficiency on Ordered Micro-region,Dielectric and Electrostrictive Properties of PZN-based Ceramics

研究了初始粉体中氧化铅欠缺对PZN基陶瓷的相组成、有序微区、介电和电致应变性能的影响。研究发现,随着氧化铅欠缺量的增大,预烧粉体和陶瓷的焦绿石相含量逐渐增大、钙钛矿相含量逐渐减少。当铅欠缺小于1%时,随着铅欠缺量的增大,PZN基陶瓷的有序微区、介电常数和电致应变大幅度增大;而当铅欠缺大于1%时,铅欠缺会使介电和电致应变性能下降。而铅欠缺对介电损耗影响很小。铅欠缺使介电和电致应变性能增加的原因主要是由于"有效有序微区"尺寸的增大和晶界间过量氧化铅层的消除。

The effect of PbO deficiency in starting raw powders on the phase structure, ordered micro-regions, dielectric and electrostrictive properties of PZN-based ceramics was investigated. The results demonstrated that even minor content of PbO deficiency would result in pyrochlore phase in both calcined powders and sintered ceramics. With the increase of deficient PbO, the perovskite phase content decreased gradually. When the content of PbO deficiency is less than 1% , the size of ordered micro-region, dielectric constant and electrostrictive strain increased greatly with the increase of PbO deficiency. However, when PbO deficiency is more than 1%, PbO deficiency would result in the decrease of dielectric and electrostrictive properties. PbO deficiency only affected dielectric loss very weakly. The increase of dielectric constant and electrostrictive strain resulted from the enlargement of the size of effective ordered micro-regions and the elimination of PbO film among crystal borders.