Distribution characteristics of boundary phase in BaB2O4 added BaTiO3 ceramics were investigated with a focus on the curvature difference of solid–liquid interfaces at two-grain and triple junctions. High-resolution transmission electron microscopy revealed that the triple junction of solid grains showed the positive curvature of solid–liquid interface and consisted of the mixture of liquid phase and crystallized BaB2O4 phase. On the other hand, flat amorphous thin film of 2.5-nm thickness was observed at the two-grain junction. This kind of boundary phase distribution characteristic was explained by the solubility difference between two kinds of junctions of solid grains that had different curvature of solid–liquid interfaces.
研究了添加了 BaB2O4 的 BaTiO3 陶瓷中边界相的分布特征,重点是两晶粒和三交界处固液界面的曲率差。高分辨率透射电子显微镜显示,固态晶粒的三重交界处呈现出固液界面的正曲率,由液相和结晶 BaB2O4 相的混合物组成。另一方面,在两晶粒交界处观察到厚度为 2.5 纳米的扁平无定形薄膜。这种边界相分布特征可解释为固液界面曲率不同的两种固体晶粒交界处的溶解度差异。