Disk-type piezoelectric transformer of a Na_0.5K_0.5NbO₃-CuNb₂O₆ lead-free ceramic for driving T5 fluorescent lamp

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• 作者：Ming-Ru Yang^a ; ^b ; Sheng-Yuan Chu^a ; ^c ; ^{chusy@mail.ncku.edu.tw} ; I.-Hao Chan^d ; Song-Ling Yang^a
• 关键词：NKN ; Ceramic ; Lead-free ; Piezoelectric ; Transformer
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 May, 2012
• 卷：522
• 期：Complete
• 页码：3-8
• 文件大小：1011 K

摘要

Lead-free (Na_0.5K_0.5)NbO₃ (NKN) ceramics doped with 1 mol%CuNb₂O₆ (CN) ceramics were prepared using the conventional mixed oxide method, with a sintering temperature of 1075 掳C. Microstructural analyses of the NKN-01CN ceramics were carried out and compared, using X-ray diffraction (XRD). NKN-01CN ceramics sintered at 1075 掳C not only exhibited excellent 鈥榟ard鈥?piezoelectric properties of k_p = 40%, k_t = 45%, k₃₃ = 57%, a ferroelectric property of E_c = 23 kV/cm, and an extraordinarily high mechanical quality factor (Q_m) of 1933 but also showed excellent stability with temperature (TCF = 鈭?54 ppm/掳C). The piezoelectric transformer was simplified, using an equivalent circuit, and analyzed, using MATLAB; the simulation data agreed well with the experimental results. An efficiency of 95.7%was achieved for the NKN-01CN piezoelectric transformer with load resistance of 20 k惟. An 8 W T5 fluorescent lamp was successfully driven by the NKN-01CN piezoelectric transformer.