LOW-FREQUENCY INTERNAL FRICTION STUDY ON MODIFIED LEAD METANIOBATE CERAMICS

• 来源期刊: 中国物理（英文版）
• 年，卷（期）: 2000,（2）
• 所属期刊栏目: CONDENSED MATTER：ELECTRONIC STRUCTURE，ELECTRICAL
• 页码范围: 149-152
• 页数: 4页
• 语种: 英文

摘要

Six Q-1 peaks in freshly-worked PbNb2Oa ceramics are observed by low-frequency internal friction measurementso far as we know for the first time. P1, P2, and P4 appear at the first heating process with remarkable shear modulusanomalies. But they are not observed during the cooling process or in the well-annealed samples. Those peaks areconsidered to be related with the working processes. P3 is a widened Debye relaxation peak in nature. The activationenergy and pre-exponential factor are about 1.0leV and 2.5 × 10-12 s, respectively. This peak is attributed to theinteraction of domain walls and oxygen vacancies. P6 is corresponded with the paraelectric and ferroelectric phasetransition. P5, appearing near Tc, is thought to be caused by the viscous movement of the domain walls.