纳米BaTiO_3及其陶瓷材料的特殊物性的研究  

Study on Peculiar Properties of Nanocrystalline BaTiO_3 Powder and Ceramics

作　　者：任天令[1] 朱嘉麟[1] 熊家炯[1] 王晓慧[2] 李龙土[2] 

机构地区：[1]清华大学现代应用物理系,北京100084 [2]清华大学材料科学与工程系,北京100084

出　　处：《功能材料》1998年第1期68-71,共4页Journal of Functional Materials

摘　　要：报导了硬脂酸凝胶法制备的 Ba Ti O3纳米晶及烧制的陶瓷材料的特殊物性。用 X射线衍射、高分辨透射电镜、X荧光光谱、表面光电子能谱、介电谱、热释电谱研究了纳米微粉及陶瓷材料的晶体结构、晶粒尺寸、体相和表面相组份及铁电性能。结果表明 ,所有样品在室温下均为立方结构 ,没有铁电性 ,陶瓷样品在低温下 ( <2 0 0 K)具有铁电性。并发现纳米晶 Ba Ti O3及陶瓷具有湿敏特性。In this paper,the peculiar properties of nanocrystalline BaTiO 3 powder and ceramics prepared by stearic acid gel method (SAG method) was intruduced.XRD,HRTEM,X ray fluorescence spectrum, XPS, dielectric and pyroelectric measurements were used to investigate the crystallite structures,grain size,chemical content and ferroelectricity.The results showed that all the samples prepared by SAG method appeared cubic structures and no ferroelectricity was detected at room temperature.Whereas the ceramic sample showed ferroelectricity at low temperature 200K.And the excellent humidity sensitivity of nanocrystalline BaTiO 3 powder and ceramics was found.

关 键 词：纳米晶 铁电性 湿敏性 钛酸钡 晶体 

分 类 号：O48[理学—固体物理] O73[理学—物理]