晶粒与晶界对BaTiO3基陶瓷PTC效应的协同调制研究

Coordinating Control of the PTC Effect on BaTiO3 Based Ceramic by Grain and Grain Boundary

摘要:

采用传统的固相法,制备了Y、Mn共掺杂的BaTiO₃陶瓷。利用X射线衍射仪、扫描电子显微镜和能谱仪分别对样品的物相、微观结构和化学组分进行表征,并测量了样品的电学参数。结果表明：Y掺杂能有效降低室温电阻,但过量的Y会在晶界处偏析,其与晶界上的Mn相互作用,削弱PTC效应。通过晶粒和晶界的协同作用,可有效调控BaTiO₃陶瓷的PTC效应。

Abstract:

Y and Mn co-doped BaTiO₃ ceramics were prepared by the conventional solid state reaction. The phases, microstructures and compositions of the prepared samples were characterized by X-ray diffractometer, scanning electron microscope and energy dispersive spectrometer, respectively, and the electrical parameters were measured. Results showed that the room temperature resistance of BaTiO₃ could be effectively decreased by Y doping. However, the excessive Y would segregate at the grain boundary, which weakened the PTC effect of BaTiO₃ ceramic, combined with Mn at the grain boundary. Through the coordinating behavior between grain and grain boundary, the PTC effect of BaTiO₃ ceramic could be efficiently tailored.