BaTiO_3陶瓷中氧缺位引起的弛豫内耗峰  

Relaxation-type Internal Friction Peak due to the Oxygen Vacancy in BaTiO_3 Ceramics

作　　者：张进修[1] 陈岚[1] 孟荟[1] 熊小敏[1] 

机构地区：[1]中山大学物理科学与工程技术学院∥光电材料与技术国家重点实验室,广东广州510275

出　　处：《中山大学学报（自然科学版）》2004年第6期181-182,共2页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(10027001)

摘　　要：用弯曲振动法观测到BaTiO3陶瓷中用扭转振动法观测不到的氧缺位导致的弛豫内耗峰及二级相变时的内耗峰和模量极小。这说明振动模式的不同将导致内耗结果的差异,因此,应重新审视以往的内耗研究结果。With the method of applying bending vibration to ceramic BaTiO_3, a relaxation internal friction peak due to oxygen vacancy and another internal friction peak accompanied by a modulus minimum due to the second order phase transformation are readily observed, but have not been found by applying the conventional torsional method. These results clearly demonstrate that different vibration modes lead to different observations in the internal friction measurement,and imply that it is very necessary to re_examine those obtained in previous internal friction researches.

关 键 词：内耗 弯曲振动 BATIO3 氧缺位 

分 类 号：O483[理学—固体物理]