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分别采用固相反应烧结法和注模法制备(Pb1-xLax)(Zr0.5Ti0.5)1-x/4O3(x=0.01～0.13)锆钛酸铅镧(lead lanthanum zironate titanate,PLZT)压电陶瓷和0-3型PLZT/聚偏二氟乙烯(polyvinylidene fluoride,PVDF)复合材料。用X射线衍射表征PLZT陶瓷结构。用热膨胀系数突变法测量Curie温度,并研究PLZT陶瓷及其复合材料的介电与压电性能。结果表明:随着La掺量从0.01增加到0.13,PLZT陶瓷的四方度逐渐减小,四方相逐渐向三方相转变;同时Curie温度从356℃线性下降到28℃;相对介电常数和介电损耗则逐渐增大;压电应变系数和机电耦合系数呈先增大后减小的趋势,在x=0.07处取得极大值,分别为224 pC/N和0.5;随着PLZT陶瓷相Curie温度的下降及压电特性的变化,0-3型PLZT/PVDF复合材料的相对介电常数和压电应变系数呈逐渐上升趋势,其中压电应变系数从20 pC/N增大到34 pC/N,可归因于陶瓷相极化的改善。
(Pb1-xLax) (Zr0.5Ti0.5) 1-x / 4O3 (x = 0.01-0.13) lead lanthanum zironate titanate (PLZT) was prepared by solid state reaction sintering and injection molding respectively Ceramic and 0-3 type PLZT / polyvinylidene fluoride (PVDF) composite material. Characterization of PLZT Ceramics by X - ray Diffraction. The Curie temperature was measured by the CTE method and the dielectric and piezoelectric properties of PLZT ceramics and their composites were investigated. The results show that with the increase of La content from 0.01 to 0.13, the squareness of PLZT ceramics gradually decreases and the tetragonal phase gradually changes to the trihedral phase. At the same time, the Curie temperature decreases linearly from 356 ℃ to 28 ℃. The relative dielectric constant and dielectric constant The piezoelectric strain coefficient and electromechanical coupling coefficient firstly increase and then decrease, reaching the maximum at x = 0.07, which is 224 pC / N and 0.5 respectively. With the increase of the Curie temperature of PLZT The relative permittivity and piezoelectric strain coefficient of 0-3 type PLZT / PVDF composites increase gradually, and the piezoelectric strain coefficient increases from 20 pC / N to 34 pC / N , Can be attributed to the improvement of the ceramic phase polarization.