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偏铌酸铅陶瓷低频内耗的研究

贺连星1; 李承恩1; 陈廷国2; 刘卫3; 朱震刚3; 水嘉鹏3   

  1. 1.中国科学院上海硅酸盐研究所, 上海 200050; 2. 中国科学院上海冶金所, 上海 200050; 3. 中国科学院内耗与团体缺陷开放实验室, 合肥 230031
  • 收稿日期:1999-09-07 修回日期:1999-09-29 出版日期:2000-10-20 网络出版日期:2000-10-20

Low-Frequency internal Friction of Lead Metaniobate Ceramics

HE Lian-Xing1; LI Cheng-En1; CHEN Ting-Guo2; LIU Wei2; ZHU Zen-Gang3; SHUI Jia-Peng 3   

  1. 1.Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China; 2. Shanghai Institute of Metallurgy; Shanghai 200D50; Laboratory of Internal Friction and Defects in Solid, Academia Sinica, Hefei 230031, China
  • Received:1999-09-07 Revised:1999-09-29 Published:2000-10-20 Online:2000-10-20

摘要: 用低频倒置扭摆对改性偏铌酸铅铁电陶瓷的内耗进行了研究.在新加工的样品中发现了六个内耗峰,分别位于70℃(P峰)、 90℃(P峰)、200℃(P峰)、260℃(P峰)、430℃(P峰)和510℃(P峰)处.对引起P、P、P和P峰的物理机制进行了详细探讨.分析结果表明,P峰的本质是一定化的 Debye弛豫内耗峰。相应的激活能和指前因子分别为1.014V和 2.4×10-14s.它源于氧空位与畴壁的相互作用. P、 P和 P峰与试样的切割加工密切相关,可归结为点缺陷与位错的交互作用.

关键词: 内耗, 偏铌酸铅陶瓷, 畴壁, 氧空位

Abstract: The internal friction Q-1 of Lead Metaniobate ceramics was investigated by inverted torsion pendulum.
Six internal friction peaks, with their location around 70℃(P1), 90℃(P2), 200℃(P3), 260℃(P4), 430℃(P5) and 510℃(P6), respectively, were observed
in a freshly-worked PbNb2O6 ceramics. The mechanisms for P3, P1, P2 and P4 were analyzed in detail. P3 is a broadened Debye relaxation peak in nature, and its corresponding activation
energy and pre-exponential factor are 1.01eV and 2.5×10-12s, respectively. This peak is attributed to the interaction between domain walls and oxygen
vacancies. P1, P2, and P4 are clearly related to the working processes. They can be caused by the interaction between dislocations and point defects.

Key words: internal friction, lead metaniobate ceramics, domain walls, oxygen vacancy

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