施受主杂质La、Mn共掺BaTiO_3陶瓷PTC特性的研究

PTC Characteristic of BaTiO3 Ceramics Doped with Donor La and Acceptor Mn

采用溶胶－凝胶法制备施主杂质Ｌａ和受主杂质Ｍｎ均相共掺ＢａＴｉＯ３半导体陶瓷。掺杂过程中以Ｌａ、Ｍｎ的硝酸盐水溶液代替醇盐实现均相掺杂，改善组分均匀性。讨论了受主杂质Ｍｎ的浓度与陶瓷ＰＴＣ性能的关系，并结合ＸＰＳ测量结果。

BaTiO3 semiconductor ceramics doped with donor La and acceptor Mn are synthesized through solgel method.In the doping process,nitrate can be used to substitute for conventional alkoxides so as to realize homogenous doping and improve the components homogeneity of BaTiO3 ceramics.The relationship between the concentration of donor Mn and PTC characteristic,microcosmic mechanism of PTC characteristic are discussed,together with XPS (Xray photoelectron spectroscopy) measurement.