作　　者： ; ; ;

机构地区： 华南农业大学理学院

出　　处： 《华南理工大学学报（自然科学版）》 2009年第3期29-33,共5页

摘　　要： 采用非均匀形核表面包覆法和化学混合法分别制备了钇掺杂纳米晶钛酸钡(Y-BT)粉体.通过差示扫描量热分析、热重分析、电感耦合等离子体发射光谱分析及扫描电镜分析等方法,对制得的粉体及其陶瓷样品进行表征;同时讨论了Y掺杂量对不同方法制备的Y-BT陶瓷室温电阻率的影响.结果表明:相比于化学混合法,非均匀形核表面包覆法制备的Y-BT样品中Y组分分布和晶粒大小更均匀,化学计量比更准确;非均匀形核表面包覆法制得的Y-BT陶瓷在Y掺杂量为0.1%时即可实现半导化,能在较低的温度下达到更低的最小室温电阻率. Y-doped nano-crystalline barium titanate （Y-BT） powders were prepared via the heterogeneous-nucleation surface-coating method and the chemical-mixing method, respectively. The prepared powders and the sintered ceramic samples were then characterized by means of differential scanning calorimetry, thermogravimetry, induc- tively-coupled plasma-atomic emission spectrometry and scanning electron microscopy. Moreover, the effect of Y dosage on the room-temperature resistivity of the Y-BT ceramics prepared with different methods was discussed. The results show that, as compared with the Y-BT powders prepared via the chemical mixing method, the powders pre- pared via the coating method have more homogeneous Y distribution, more uniform crystal size and more accurate stoichiometric ratio, and that the corresponding Y-BT ceramic possesses good semiconducting properties at a Y dosage of only 0. 1% and achieves more minimum room-temperature resistivity at a low temperature.

关 键 词： 钇 钛酸钡 非均匀形核 表面包覆 电阻率

领　　域： [化学工程] [化学工程]