0-3/1-3混合连通型铁电陶瓷-铁电聚合物的热释电性

推导出了0-3/1-3混合连通型铁电陶瓷-铁电聚合物的热释电系数表达式, 并详细讨论了陶瓷体积分数 v₂和陶瓷颗粒粒径与膜厚比(G/t)分别对复合材料的热释电系数p_c及p_c/ε_c(ε_c为复合材料的介电常数)的影响。结果表明: 当G/t≥0.5时, 不同陶瓷体积分数复合材料的热释电系数p_c均趋向于某个定值, 说明此时G/t对热释电系数的影响可忽略不计; 另外当陶瓷体积分数为0.1时, 随着G/t的增大, p_c /ε_c出现一个极大值, 且当G/t=0.9时, p_c /ε_c比纯PZT陶瓷的大8倍, 表明此条件为最佳工艺条件。而且, 在低陶瓷体积分数和低G/t比时, 理论曲线与实验数据符合较好。 

Research on pyroelectric properties of ferroelectric ceramic- ferroelectric polymer 0-3/1-3 composites

An expression was derived for the pyroelectric coefficient of ferroelectric ceramic-ferroelectric polymer 0-3/1-3 composites; the influence of ceramic volume fraction v2 and the ratio of ceramic grain size to film thickness(G/t) on the pyroelectric coefficient(pc) and pc/ε c of ferroelectric composites is discussed. The results show that when G/t≥0.5, at different ceramic volume fractions v2, the pyroelectric coefficient tends to become constant. This means that the influence of G/t on the pyroelectric coefficient is neglectable. When ceramic volume fraction v2=0.1 and G/t increases, pc/εc will reach its maximum. When G/t=0.9, pc/εc of ferroelectric composites is 8 times larger than that of pure PZT ceramics. v2=0.1 and G/t=0.9 were the best technological condition. Additionally, theoretical curves and experimental data fit each other at low ceramic volume fractions and low G/t.