(Bi0.5Na0.5)0.94Ba0.06TiO3 / P(VDF-TrFE) 0-3正弦波电场极化复合材料

2006 15th ieee international symposium on the applications of ferroelectrics Pub Date : 2006-07-01 DOI:10.1109/ISAF.2006.4387843

K. Lam, X.X. Wang, H. Chan

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引用次数: 0

摘要

将钛酸铋钠钡[(Bi0.5Na0.5)0.94Ba0.06TiO3或BNBT6]陶瓷粉末掺入聚偏氟乙烯-三氟乙烯[P(VDF-TrFE) 70/30 mol%]共聚物基体中，形成0-3复合材料。由于成分接近形态营养相边界(MPB)区域，BNBT6具有较高的压电性能。聚偏氟乙烯-三氟乙烯[P(VDF-TrFE)]是一种具有高压电和热释电性能的铁电共聚物。采用溶剂浇铸法将陶瓷粉末分散在共聚物基体中，然后热压法制备BNBT6/P(VDF-TrFE) 0-3复合材料，其体积分数Phi在0.05 ~ 0.3之间。在不同的交流极化条件下，测量了复合材料的热释电系数与Phi的函数关系。由于BNBT6包体和P(VDF-TrFE)基体在相似条件下均可极化，复合材料在多次正弦电场作用下均可有效极化。实验结果表明，与锆钛酸铅PZT / P(VDF-TrFE) 0-3复合材料(直流源)相比，BNBT6 0-3复合材料(交流源)具有更好的热释电性能。

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(Bi0.5Na0.5)0.94Ba0.06TiO3 / P(VDF-TrFE) 0-3 Composites Poled with a Sinusoidal Electric Field

Bismuth sodium barium titanate [(Bi0.5Na0.5)0.94Ba0.06TiO3 or BNBT6] ceramic powder have been incorporated into a polyvinylidene fluoride-trifluoroethylene [P(VDF-TrFE) 70/30 mol%] copolymer matrix to form 0-3 composites. With the composition near the morphtrophic phase boundary (MPB) region, BNBT6 has relatively high piezoelectric properties. Polyvinylidene fluoride-trifluoroethylene [P(VDF-TrFE)] is a ferroelectric copolymer that has high piezoelectric and pyroelectric performance. BNBT6/P(VDF-TrFE) 0-3 composites with BNBT6 volume fraction Phi ranging from 0.05 to 0.3 were prepared using solvent casting to disperse the ceramic powder in the copolymer matrix followed by hot-pressing. The pyroelectric coefficient of the composites was measured as a function of Phi under different A.C. poling conditions. As both the BNBT6 inclusion and P(VDF-TrFE) matrix can be poled under similar conditions, the composites can be poled effectively after subjected to several cycles of sinusoidal electric field. The BNBT6 0-3 composites (poled with a.c. source) were found to have better pyroelectric properties than that of lead zirconate titante PZT / P(VDF-TrFE) 0-3 composites (poled with d.c. source).

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2006 15th ieee international symposium on the applications of ferroelectrics

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