Modulation of electrical properties of KNNS–BNKZ lead-free ceramics by calcination temperatures

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• 作者：Wenjuan Wu ; Min Chen ; Wu Bo ; Yingchun Ding…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：28
• 期：2
• 页码：2086-2092
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

In this work, the 0.96(K_0.5Na_0.5)(Nb_0.96Sb_0.04)O₃–0.04Bi_0.5(Na_0.5K_0.5)_0.5ZrO₃ (KNNS–BNKZ) ceramics were prepared by the conventional solid-state method, and effects of calcination temperatures (T_cal) on their microstructure, phase structure, and electrical properties were investigated in detail. It was found that the calcination temperatures strongly affect the phase structure of the ceramics, that is, rhombohedral–orthorhombic–tetragonal phase coexistence for T_cal = 500–600 °C and rhombohedral–tetragonal phase coexistence for T_cal = 650–950 °C. In addition, their electrical properties are also very sensitive to the calcination temperatures. A high piezoelectricity of 450–475 pC/N can be attained in a wide calcination temperature of 750–900 °C, and especially the ceramics calcined at 850 °C exhibit optimum electrical properties: d₃₃ = 475 pC/N, k_p = 0.51, ε_r = 2561, tan δ = 0.033, P_r = 15.2 μC/cm2, E_C = 7.1 kV/cm, and T_C = 222 °C. In addition, all the ceramics exhibit a good thermal stability of piezoelectric activity. As a result, we believe that the electrical properties of KNN-based ceramics can be well controlled by optimizing calcination condition.