Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_3/CoFe_2O_4叠层复合陶瓷的制备与磁电耦合效应研究

Preparation and Magnetoelectric Coupling Effects of Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_3/CoFe_2O_4 Laminated Ceramics

以CoFe2O4压磁体、掺CuO和CeO2助烧剂的压电体Ba0.85Ca0.15Zr0.1Ti0.9O3为基本叠层材料,采用界面固相熔融渗透法制备了掺助烧剂Ba0.85Ca0.15Zr0.1Ti0.9O3-CoFe2O4叠层复合陶瓷。叠层复合陶瓷的压电压磁相叠层界面结合良好。随着压磁相与压电相厚度比比率的增加,叠层复合陶瓷的饱和磁致伸缩系数–λ从67×10-6增加到134×10-6、压电系数d33从340 pC/N逐渐减小到205 pC/N;磁电耦合系数先增大后减小,在厚度比为2、外磁场为100 mT时得到最大值3200 mV/(cm.mT)。

The Bao.85Cao.15Zr0.1Ti0.903-foFe204 laminated composite ceramics composed of the piezomagnet CoFe204, and the piezoelectrics Bao.85Cao.lsZr0.1Ti0.903 with the sintering agents CuO and CeO2, were prepared by the interracial solid-state melt infiltration technique. It is found that a good interfacial bonding between the piezomagnet and piezoelectrics is obtained. With the increasing thickness ratio of piezomagnet to piezoelectrics, the magnetostriction coefficient （-2） of the laminated ceramics increase, the piezoelectric coefficient （d33） decrease, and the magnetoelectric coupling coefficient （aE） increases firsty and then decreases. The values of and d33 of the laminated ceramics are in the range from 67x10^6 to 134x10^6 and 205 pC/N to 340 pC/N, respectively. At dc mag- netic field of 100 mT along with ac frequency of 230 kHz and the thickness ratio of 2, a maximum value of aE=3200 m/（cm.mT） is achieved for the laminated ceramics.