微波场中烧结BaTiO_3系半导体陶瓷的研究

Sintering of BaTiO_3-based Semiconducting Ceramics in Microwave Field

采用ＴＥ_１０３单模腔微波炉烧结ＢａＴｉＯ_３系半导体陶瓷，对微波与陶瓷材料相互作用机制进行了探讨，分析了ＢａＴｉＯ_3陶瓷微波结过程中各损耗随温度的变化规律；同时，分别在体系中引入受主杂质Ｃｒ^(３＋)和施主杂质Ｎｂ^(5+)，研究微波场中杂质浓度对钛酸钡陶瓷晶粒生长的影响。

BaTiO_3-based semiconducting ceramics were sintered in TE103 single-mode cavity microwave furnace. The mechanism of microwave acting on ceramic materials was studied. Meanwhile,Nb5+ as donor impurity and Cr3+ as acceptor impurity were doped in BaTiO3 ceramics,respectively. The results indicated that the impurities had an obvious effect on grain growth of BaTiO3 ceramics in microwave field. Based on defect chemistry,a reasonable explanation was given on the phenomenon.