【摘要】 研究了Ｐｂ（Ｍｇ＿（１／２）Ｗ＿（１／２））Ｏ＿３－ＰｂＴｉＯ＿３－ＰｂＺｒＯ＿３陶瓷的化学不均匀性和介电行为。ＥＤＳ分析得到：体系中存在富Ｗ和富Ｚｒ、Ｔｉ的两相，平均分子式为：Ⅰ相（富Ｗ相）：Ｐｂ（Ｍｇ＿（０．２７０）Ｗ＿（０．３６７）Ｔｉ＿（０．１７８）Ｚｒ＿（０．１８２））Ｏ＿（３．０９１）；Ⅱ相（富Ｚｒ、Ｔｉ相）：Ｐｂ（Ｍｇ＿（０．１０９）Ｗ＿（０．１８７）Ｔｉ＿（０．２０４）Ｚｒ＿（０．３４０）Ｏ＿（２．７５８）。两相居里点分别为：Ｔ＿（ｃＩ）＜－６５℃，Ｔ＿（ｃＩ）＝１０５℃，图像处理得到两相的面积比为：Ｓ＿Ⅰ＝６８．６４％，Ｓ＿Ⅱ＝３１．３６％。按３－３模型复合，得到两相体积比为：７６％、２４％。复合相的介电性能符合Ｘ７Ｒ要求，｜ＴＣＣ｜≤１２％，且介－温曲线与原材料有相同的规律。更多还原

【Abstract】 The chemical inhomogeneity and dielectric behavior of Pb(Mg_1/2W_1/2)O₃-PbTiO₃-PbZrO₃ ceramic wereinvestigated.Two phases,W-rich and Zr,Ti-rich,were observed by XRD.The average compositionformulas were Pb(Mg_0.270W_0.367Ti_0.178Zr_0.182) O_3.091 for phase Ⅱ（W-rich）and Pb(Mg_0.109 W_{0. 187} Ti_0.204 Zr_0.340 )O_2.758 for phase Ⅱ（Zr,Ti-rich）.The Curie temperatures were Tc Ⅱ<-65℃and Tc Ⅱ=105℃, respectively, The two phases were mixed in 3-3 model with a volume ratio of 76/24.The dielectric properties of comples phase meet the X7R specification.更多还原