【摘要】 用二步合成法制备了（１－ｘ）Ｐｂ（Ｍｇ１／３Ｎｂ２／３）Ｏ３－ｘＰｂＴｉＯ３原料，并制成了纯钙钛矿结构压电陶瓷．研究了三方－四方相界附近组份（ｘ＝０．２５～０．４０）及工艺与性能的关系．结果表明，在ｘ＝０．３２～０．３５间材料具有较大的介电常数，压电常数，耦合系数以及较低的品质因数．材料以１２００℃附近保温１５０ｍｉｎ为佳．材料性能表明，有希望成为新型压电陶瓷．更多还原

【Abstract】 (1 - x)Pb（Mg₁/3Nb₂/3）O₃-xPbTiO₃ （PMN-PT） ceramics with x near morphotropicphase boundary （x=0.25⁰.40） were prepared by Columbite technique. The influences of PT content and preparation process on dielectric, ferroelectric and piezoelectric properties were studied.The results show that ceramics with x between 0.32 and 0.35 possess higher dielectric constant,piezoelectric constant, coupling factor and lower mechanical figure of merite. The properties arecomparable to best soft PZT ceramics.更多还原