Zn-Al共掺对0.95MgTiO3-0.05CaTiO3介电性能的影响

采用固相反应法制备了 (Mg_0.93Ca_0.05Zn_0.02)(Ti_1-xAl_x)O₃介质陶瓷.研究了Zn-Al共掺杂对0.95MgTiO₃-0.05CaTiO₃(95MCT)陶瓷介电性能的影响.结果表明：Zn-Al共掺杂的95MCT陶瓷的主晶相为MgTiO₃和CaTiO₃两相结构，Zn-Al共掺杂可以抑制中间相MgTi₂O₅的产生，同时，有第二相CaAl₂O₄出现；Zn-Al共掺杂能有效地降低95MCT陶瓷的烧结温度至1300℃，改善介电性能，并对介电常数温度系数具有调节作用.当 Zn²⁺掺杂量为0.02mol、Al³⁺掺杂量为0.02mol时， 在1300℃烧结2.5h获得最佳性能：ε_r =20.35, tgδ=2.0×106, α_c=1.78×106.

Influence of Zn-Al Codoping on Dielectric Properties of 0.95MgTiO3-0.05CaTiO3 Ceramics

The dielectric properties of (Mg_0.95Ca_0.05Zn_0.02)(Ti_1-xAl_x)O₃ ceramics prepared by conventional solid-state route were investigated. The results show that MgTiO₃ and CaTiO₃ are the main phases of 95MCT ceramics with codoped Zn-Al, without second phase MgTi₂O₅ is observed but a new phase CaAl₂O₄. Zn-Al additive can lower the sintering temperature of 95MCT ceramics to 1300℃, and improve the dielectric properties. Moreover, it also effectively adjusts the temperature coefficient of dielectric constant. The 95MCT ceramics with x=0.02 possess excellent dielectric properties: dielectric constant ε_r of 20.35, dielectric loss tgδ of 2.0×106 and temperature coefficient of dielectric constant α_c value of 1.78×106.