BaTiO_3多晶陶瓷表面态研究

Study on the surface state of BaTiO_3 ceramics

文中系统地对BaTiO3陶瓷的表面态进行综述 ,认为表面态确实是PTC效应产生的根源所在 ,同时对表面态的组成(主要对表面态中金属阳离子空位 ,氧空位 )、微量 3d元素对表面受主态的显著影响以及表面态密度的定量计算三方面进行分析 ,认为表面态研究的难点在于其组成的复杂性 ,认为用电介质理论定量计算表面态密度存在粗略性问题 ,同时对表面态的研究前景进行展望。

The surface state of BaTiO3 ceramics was discussed systematically. The source of PTC effect of BaTiO3 ceramics was due to the acceptor surface state. The defect composition, including metal vacancies and oxygen vacancies, the significant effect of tiny 3d elements on the surface state and the calculation of surface state density were discussed, respectively. The difficulty of surface state lay on the complex of the composition, and the calculation of surface state density using dielectric theory was not exact. At the same time, the tendency of study on surface state was proposed.