以高度定向的BaTiO3晶须作为活性相、聚偏氟乙烯(PVDF)作为基体制备了压电复合材料.研究了该复合材料的介电和电学性能.研究结果表明,以BaTiO3作为活性相的晶须复合材料与粉末复合材料相比,其介电常数(ε)、压电常数(d33)和剩余极化率(Pr)大大提高,而其损耗因子(tanδ)具有相反的趋势.对晶须复合材料,沿晶须定向方向的ε、d33和Pr的值比晶须平行方向要高得多.分析了产生这些差别的原因.
A piezoelectric composite was prepared with highly aligned BaTiO3 whiskers as active phase and
polyvinylidene fluoride (PVDF) as matrix. Its dielectric and electromechanical properties were investigated. The experimental results show that the
dielectric constant (ε), piezoelectric constant (d33) and remnant polarization (Pr) are considerably higher in the whisker composite
than in the corresponding composite containing BaTiO3 powders as the active phase, while the loss factors follow the opposite trend. For the whisker
composite, ε, d33 and Pr along the direction of the whisker orientation (normal specimen) are much higher than the values
normal to the whisker orientation (parallel specimen). The reasons for the observed differences were discussed.
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