Al_2O_3添加剂对合成MgTiO_3陶瓷相组成及介电性能的影响  

Effects of Al_2O_3 on the Microwave Dielectric Properties of MgTiO_3Ceramics

作　　者：王康宋[1] 罗澜[1] 陈玮[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》2002年第3期509-514,共6页Journal of Inorganic Materials

摘　　要：研究了添加剂Ａｌ２Ｏ３对ＭｇＯ和ＴｉＯ２合成ＭｇＴｉＯ３陶瓷烧结性、物相组成和微波介电性能的影响,ＸＲＤ分析结果表明:没有添加Ａｌ２Ｏ３时,合成的ＭｇＴｉＯ３陶瓷中只含有ＭｇＴｉＯ３和ＭｇＴｉ２Ｏ５相;加入Ａｌ２Ｏ３后,ＭｇＴｉＯ３陶瓷中除了ＭｇＴｉＯ３和ＭｇＴｉ２Ｏ５相外,还出现了ＭｇＡｌ２Ｏ４相,这是由于Ａｌ２Ｏ３和 ＭｇＯ发生固相反应．ＭｇＡｌ２Ｏ４的出现虽然阻碍材料的致密化并导致密度下降,但是可以降低反应烧结合成ＭｇＴｉＯ３陶瓷的相对介电常数和介电损耗．MgTiO3 ceramics were prepared by MgO and TiO2 with A12O3 added, the sintering, microwave dielectric properties and phases were investigated. XRD shows that there are two phases in MgTiO3 ceramics without A12O3 added: MgTiO3 phase and MgTi2O5 phase; besides these phases, MgAl2O4 phase appears after Al2O3 added, because of the solid phase reaction between MgO and TiO2. Although the MgAl2O4 phase impedes sintering and decreases the density, it decrease the the dielectric constant and the dielectric loss.

关 键 词：AL2O3 添加剂 MgTiO3陶瓷 相组成 介电性能 相对介电常数 介电损耗 钛酸镁陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.13[化学工程—硅酸盐工业]