研究了BaTiO03-R2O3-MgO(R=La,Ce,Pr,Nd,Sm,Gd,Dy,Ho,Y,Er,Yb)系介质的稀土掺杂效应.结果表明,大半径稀土离子在BaTiO3中形成元素均匀性分布,并促进晶粒的长大;而小半径稀土离子能产生明显的细晶效应,在晶界局部富集而偏析出现焦绿石型第二相晶粒R2Ti2O7.随着镧系收缩,稀土掺杂BaTiO3陶瓷的绝缘电阻率明显提高,而稀土离子在BaTiO3中的固溶度大致呈降低趋势.大半径稀土掺杂材料的ε-T曲线呈现单峰效应且居里点下移,而小半径稀土掺杂材料为双峰效应且居里点上升,△C/C-T稳定性显著提高达到X8R.
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