Structural defects and non-ferroelectric piezoelectricity in an unpoled SrTiO₃-Bi₁₂TiO₂₀ (ST-BT) composite ceramics

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• 作者：L.J. Zhang^a ; T. Wang^b ; L.H. Wang^c ; J.D. Liu^a ; M.L. Zhao^c ; B.J. Ye^a ; ^{bjye@ustc.edu.cn}
• 关键词：Ceramics ; Piezoelectricity ; Positron annihilation ; Crystal defects ; Flexoelectric effect
• 刊名：Scripta Materialia
• 出版年：2012
• 期刊代码：157_13596462
• 类别：et
• 出版时间：July, 2012
• 卷：67
• 期：1
• 页码：61-64
• 文件大小：328 K

摘要

Anomalous piezoelectricity SrTiO₃-Bi₁₂TiO₂₀ (ST-BT) composite ceramics fabricated by traditional sintering technology were first studied by positron annihilation lifetime spectroscopy and Doppler broadening spectroscopy. A large number of crystal defects were observed in ST-BT composite ceramics with the sintering temperature below 980 掳C. The piezoelectric effect appeared concurrently with a high concentration of single-vacancy defects in the ceramics, suggesting that it may be closely related to the microstructure. This further proves that the flexoelectric effect is the origin of non-ferroelectric piezoelectricity.