Al_2O_3对镁镧钛陶瓷介电性能及显微结构的影响  

Influence of Al_2O_3 on the Dielectric Properties of Magnesium Lanthanum Titanate Ceramics

作　　者：王康宋[1] 罗澜[1] 张干城[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2001年第6期1220-1224,共5页Journal of Inorganic Materials

摘　　要：制备了具有不同Ａｌ２Ｏ３含量的镁镧钛陶瓷，并通过ＸＲＤ和ＳＥＭ及材料介电性能测试结果的分析研究了Ａｌ２Ｏ３对镁镧钛陶瓷材料的介电性能、晶相组成和显微结构的影响．结果发现，材料的相对介电常数εr随Ａｌ２Ｏ３含量的增加而降低，其品质因数Ｑ（Ｑ＝１／tｇδ）则相对保持了较高数值，最高可达１４４３０（１０ＧＨｚ）；不含Ａｌ２Ｏ３的镁镧钛陶瓷的晶相为ＭｇＴｉＯ３和Ｌａ０．６６ＴｉＯ2．９９,加入Ａｌ２Ｏ３后，出现新晶相ＭｇＡｌ２Ｏ４和Ｍｇ４Ａ１２ＴｉｇＯ２５，同时晶粒的平均尺寸有了显著的减小．Magnesium lanthanum titanate ceramics were prepared. The influence of Al2O3 on the dielectric properties of magnesium lanthanum titanate ceramics was studied by XRD, SEM. The study shows that with the increase of the content of Al2O3, the epsilon(r) decreases, and the quality factor Q(Q=1/tgdelta) values can be up to 14430 at 10GHz. The main crystal phase of the sample without Al2O3 is MgTiO3 with small amount of Lao(0.66)TiO(2.99); with Al2O3 added, new crystal phases MgAl2O4 and Mg4Al2Ti9O25 s.s appeare, meanwhile, the grain size of materials reduces obviously.

关 键 词：微波材料 镁镧钛陶瓷 介电性能 三氧化二铝 显微结构 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.1[化学工程—硅酸盐工业]