本實驗將以Pb(Mg1/3Nb2/3)O3-PbTiO3-PbZrO3 (PZT-PMN)為基礎材料，探討MnO2與NiO的添加對其壓電特性的影響。(1-x)PZT-xPMN陶瓷在XRD中發現有少量的Pb(Zr,Ti)O3殘留，最佳的邊界條件為0.625PZT-0.375PMN，其徑向機電耦合因數(kp)和厚度機電耦合因數(kt)皆可達55%以上。0.625PZT-0.375PMN陶瓷添加MnO2後，晶粒變得更大且更為均勻，此外，因為Mn4+離子取代B-site造成氧空缺的產生。0.625PZT-0.375PMN + 0.5 wt.% MnO2陶瓷可得到最大機械品質因數(Qm) 2950和最低共振阻抗0.7Ω。NiO的摻雜使得0.625PZT-0.375PMN + 0.5 wt.% MnO2陶瓷的機電耦合因數可提升至60%以上，機械品質因數(Qm)為1500。本實驗將以高Qm、低阻抗的組成0.375Pb(Mg1/3Nb2/3)O3- 0.625Pb(Zr0.4Ti0.6)O3 + 0.5 wt.% MnO2做為壓電變壓器的材料，藉由不同電極面積比率，探討對輸出功率、電壓增益和效率的影響，在製備出的壓電變壓器中，最大輸出功率可達>20W、效率達95%以上。最後，將製備出的壓電變壓器在輸入電壓為AC 60V下驅動LED bar。

In this study, Pb(Mg1/3Nb2/3)O3-PbTiO3-PbZrO3 (PZT-PMN) ceramics would be as a base material, and the piezoelectric characteristics of MnO2 and NiO doped into PZT-PMN ceramics were investigated. (1-x)PZT-xPMN ceramics with Pb(Zr,Ti)O3 phase were detected in all XRD profiles. The optimum boundary condition for (1-x)PZT-xPMN ceramics is x = 0.375, which exhibits the excellent properties with 55 % of above kp and kt values. When MnO2 doped into 0.625PZT-0.375PMN ceramics, the grain size becomes greater and homogeneous. In addition, the oxygen vacancies formed due to the Nb5+ ion was substituted by the Mn4+ ion, and thus higher Qm value of 2,950 and lower resonant impedance of 0.7Ω were obtained in 0.625PZT-0.375PMN + 0.5 wt.% MnO2 ceramics. NiO-doped 0.625PZT-0.375PMN + 0.5 wt.% MnO2 ceramics shows higher kp and kt values of above 60% and lower Qm value of 1,500 compared with un-doped. The composition of 0.375Pb(Mg1/3Nb2/3)O3-0.625Pb(Zr0.4Ti0.6)O3 + 0.5 wt.% MnO2 ceramics with high Qm and low impedance were chosen for fabricating the piezoelectric transformers. The effects of electrode area ratio on output power, gain voltage, and efficiency were studied. Finally, a maximum output power of > 20 W and a high efficiency of >95% were obtained. LED bar was driven using this piezoelectric transformer under an AC input voltage of 60V.

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