LOW-FREQUENCY INTERNAL FRICTION STUDY ON MODIFIED LEAD METANIOBATE CERAMICS |
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| Authors: | He Lian-xing Li Cheng-en Chen Ting-guo Yan Hai-xue |
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| Affiliation: | Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; Shanghai Institute of Metallurgy, Chinese Academy of Sciences, Shanghai 200050, China |
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| Abstract: | Six Q-1 peaks in freshly-worked PbNb2O6 ceramics are observed by low-frequency internal friction measurement so far as we know for the first time. P1, P2, and P4 appear at the first heating process with remarkable shear modulus anomalies. But they are not observed during the cooling process or in the well-annealed samples. Those peaks are considered to be related with the working processes. P3 is a widened Debye relaxation peak in nature. The activation energy and pre-exponential factor are about 1.01 eV and 2.5×10-12 s, respectively. This peak is attributed to the interaction of domain walls and oxygen vacancies. P6 is corresponded with the paraelectric and ferroelectric phase transition. P5, appearing near Tc, is thought to be caused by the viscous movement of the domain walls. |
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