【摘要】 采用固相合成法制备MnO₂掺杂TiO₂基压敏-电容功能元件,利用SEM和XRD分析手段,研究了不同MnO₂掺杂配比对TiO₂双功能陶瓷显微结构和电性能的影响。结果显示微量MnO₂掺杂的TiO₂基陶瓷主晶相为金红石相。当MnO₂的掺杂量为0.3mol%时,可以获得最佳的非线性和压敏特性,同时具有较高的介电常数和较低的介电损耗值。这是由于0.3mol%添加量的微结构晶粒更均匀,在TiO₂陶瓷基体中产生充足的氧空位,掺杂的MnO₂界面态产生了较高的晶界势垒共同作用的结果。更多还原

【Abstract】 The MnO₂-doped TiO₂ varistor-capacitor functional components were prepared by solid phase reaction methods. With the add amount of MnO₂,The effects of the microstructure and electrical properties of TiO₂ double function ceramics were investigated by SEM and XRD. The results show that the small amount MnO₂-doped TiO₂-based ceramic main phase is the rutile structure. When the doping amount of MnO₂ is 0.3 mol%, the excellent nonlinearity and varistor characteristics can be exhibited, And show a high dielectric constant and a low dielectric loss. The reason is due to the effect that the grains is more uniform, and sufficient oxygen vacancies are generated in the TiO₂ ceramic at the addition of 0.3 mol% MnO₂,And the higher grain boundary barrier result of the interface state by doped MnO₂.更多还原