PMN-PT/P(VDF-TrFE)复合材料的制备与电性能研究

摘要

Lead magnesium niobate-lead titanate (PMN-PT)ceramic prepared by columbite precursor method and polyvinylidene fluoride-trifluoroethylene P(VDF-TrFE)have been used to fabricate 0-3 composites thick films on ITO substrates by flow casting.The phase structure of PMN-PT was analyzed by XRD and the inter-face of 0-3 composites was characterized by SEM.Variation of dielectric constant (εr )and electric field applied to the ceramic phase (E c )with temperature were studied to optimize the polarization temperature.Further-more,compared with the conventional polarization in stages,PMN-PT ceramic content effect on pyroelectric properties of composites was also discussed under optimized polarization condition.The results showed that the pyroelectric coefficient increases to 58.6 μC/(m2 •K)at a ceramic mass fraction of 55% by polarizing tempera-ture with 1 10 ℃.%以铌铁矿预产物法合成的铌镁酸铅-钛酸铅(PMN-PT)陶瓷粉体和聚二氟乙烯-三氟乙烯共聚物 P (VDF-TrFE)为原料,采用流延法在 ITO 衬底上制备了不同质量配比的 PMN-PT/P (VDF-TrFE)复合厚膜.采用 XRD 及 SEM 分别分析了 PMN-PT 粉体的物相结构和复合材料的界面特征.通过测试复合材料的介电-温度曲线,计算出加载在陶瓷相上的极化分压与温度的关系,得到优化的极化温度.与常规的分步极化相比,探讨了在优化极化条件下陶瓷相含量对复合材料热释电性能的影响,结果表明在极化温度为110℃,PMN-PT 质量分数为55％时,得到了热释电系数为58．6μC/(m2•K)的热释电复合厚膜材料.