High-power impedance spectroscopy for lead-free alkali niobate piezoceramics
High-power impedance spectroscopy for lead-free alkali niobate piezoceramics
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DOI：
10.7567/jjap.56.10pd07
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发表时间：
2017-09
影响因子：
1.5
通讯作者：
H. Nishiyama;K. Kakimoto;Keiichi Hatano;Yukihiro Konishi
中科院分区：
文献类型：
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作者：
H. Nishiyama;K. Kakimoto;Keiichi Hatano;Yukihiro Konishi
研究了高功率下压电陶瓷的阻抗谱。双极高场下的阻抗谱在TC前后完全不同。在TC以下，高功率阻抗谱可以成功地拟合到三阻恒相元件(3R-CPE)等效电路。然而，在TC以上，2R-CPE等效电路足以适应高功率阻抗谱。因此，在铁电相中还存在另一个由高功率施加引起的弛豫因子。根据TC以下的高功率阻抗谱，计算了电容在强电场作用下的非线性响应。因此，磁化壁上的运动将表现为一个松弛因子。随后，比较了循环单极疲劳处理前后的高功率阻抗谱。考虑到磁畴壁运动表现为一种松弛因子的假设，在循环疲劳后，磁畴壁运动引起的电容减小。综上所述，我们认为可以通过分离其他电学性质来评估磁化壁钉扎。在这项工作中，研究了用阻抗谱测量高功率压电陶瓷的可能性。
Impedance spectroscopy for piezoceramics under high-power application was investigated. Impedance spectra under bipolar high electric field were completely different below and above TC. Below TC, high-power impedance spectra could be successfully fitted to a three resistance-constant phase element (3 R-CPE) equivalent circuit. Above TC, however, a 2 R-CPE equivalent circuit was sufficient to fit with high-power impedance spectra. For this reason, there was another relaxation factor caused by high-power application in the ferroelectric phase. From the high-power impedance spectra below TC, the nonlinear response of capacitance under a high electric field was calculated. Hence, domain wall motion would appear as a relaxation factor. Subsequently, high-power impedance spectra before and after cyclic unipolar fatigue treatment were compared. Considering the assumption that domain wall motion appeared as a relaxation factor, the capacitance caused by domain wall motion was decreased after cyclic fatigue. In conclusion, we believe that domain wall pinning could be evaluated by separating other electrical properties. In this work, the measurement possibility by impedance spectroscopy for high-power application for piezoceramics was investigated.