材料科学
电介质
煅烧
烧结
钛酸钡
陶瓷电容器
陶瓷
成核
化学工程
钙钛矿(结构)
相界
居里温度
复合材料
矿物学
相(物质)
电容器
光电子学
热力学
凝聚态物理
铁磁性
催化作用
电压
有机化学
化学
工程类
物理
量子力学
生物化学
作者
Lei Zhang,Jiaxin Wen,Zixi Zhang,Jun Yang,Hao Huang,Qiongzheng Hu,Hourong Zhuang,Hongyu Yu
标识
DOI:10.1016/j.physb.2019.02.002
摘要
As high-performance dielectric material, small sizes of barium titanate (BaTiO3) are desirable for the application of multilayer ceramic capacitors. Herein, we synthesized ultrafine BaTiO3 powders with mean particle size of (dav.) 156 nm, tetragonality (c/a) of 1.0092 and specific surface area (SBET) of 6.09 m2/g by two-step sintering process. Kinetic analysis of solid-state reaction reveals that the phase-boundary-controlled mechanism dominated the reaction process in two-step sintering process compared with one-step sintering process dominated by the first-order mechanism. It is also shown that enhanced nucleation in two-step calcination is beneficial for improving the tetragonality. In particular, the dielectric constant and dielectric loss of BaTiO3 ceramics at the Curie temperature are found to be about 12800 and 0.003. This work demonstrates a strategy to trigger a method which can effectively improve the dielectric properties of BaTiO3 ceramic.
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