纳米晶钛酸钡陶瓷尺寸效应的研究

Size Effect of Nanocrystalline BaTiO_3 Ceramics

采用等离子体烧结工艺制备出晶粒尺寸为15～100 nm高密度系列纳米晶钛酸钡陶瓷;原位变温拉曼光谱研究了纳米晶钛酸钡陶瓷微区结构特性。结果表明,纳米晶钛酸钡陶瓷相变区间弥散,呈现多相共存的结构特性;即使钛酸钡陶瓷晶粒小到15 nm,仍然存在与大晶粒钛酸钡陶瓷类似的行为即随温度的降低经历从立方→四方→正交→三方的相转变。

The bulk dense nanoceramics BaTiO3 of crystalline size 15-100 nm were prepared by the spark plasma sintering method. In-situ heating Raman spectroscopy revealed the dispersive phase transition character in the nanoerystalline BaTiO3 ceramics. The BaTiO3 ceramics of the nanograin of 15 nm exhibited the similar phase transformations from rhombohedral to orthorhombie to tetragonal to cubic transitions as those in the coarse BaTiO3 ceramics.