Journal of Inorganic Materials

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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

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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