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Research on the Properties of the PMN-PZT Piezoelectric Ceramics Doped with Fe3+ and the Optimization of Process

Author: YuFangYun
Tutor: SunQingChi
School: Tianjin University
Course: Materials Engineering
Keywords: PMN-PZT Fe2O3 piezoelectric ceramic doping style Zr/Ti synthesizing method
CLC: TM282
Type: Master's thesis
Year: 2012
Downloads: 71
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Abstract


The high dielectric loss constant, about 3% and low curie temperature of pure PMN-PZT piezoelectric ceramic limit its applications. To solve the problems, firstly, the effects of Fe2O3- doping and the doping style on the properties like piezoelectric coefficients d33, relative dielectric constant ? T33 ?0, electromechanical coupling factor kp, dielectric loss constant tg , and curie temperature Tc of 0.2PMN-0.8PZT were investigated. SEM and XRD were used to research the microstructure and phase transition. The datum indicated that 0.2PMN-0.8PZT had wide sinter temperature, about 100℃. At low Fe2O3-doping content like 0- 1.0wt%, the d33 and tgδdecreased, Qm increased as the amount of Fe2O3-doping, which showed that Fe2O3 was a hard dopant. Meanwhile, doping resulted the Tc increasing. The optimum doping content was 1.5wt%, at which doping content, the Fe2O3 had the characterize of both soft and hard dopant. In addition, Fe2O3 had the effect on the sinter temperature and could increase the ? T33 ?0 and decrease the tgδto half. The influences of different doping styles on the properties of 0.2PMN-0.8PZT were basically the same. When the Zr/Ti ratio equaled 51/49, 0.2PMN-0.8PZT+1.5wt%Fe2O3 ceramic was just at the MPB, at which point the performance reached the optimum, d33=253 pC/N, kp=0.514, ? T33 ?0=1975, tg =0.009, Tc=281℃when sintered at 1210℃. Based on the bad performance of 0.2PMN-0.8PZT, the effect of the method of synthesizing, synthesizing temperature and composition were studied. As a result, the one-step synthesizing method was better than the two-step in our lab condition. For the two-step method, preparing the MgNb2O6 in advance and then adding ZrO2, TiO2, Pb3O4 to form the PMN-PZT at the second step had better effect than at the first step to form MgNb2O6 adding ZrO2, TiO2 and at the second step adding Pb3O4 to form the PMN-PZT. What’s more, in the second step, for the synthesizing temperature, 850℃was better than 900℃. Besides, for the one-step method, the piezoelectric property of ceramic pre-sintered at the temperature, 850℃was more excellent than that at 900℃. At the same time, the d33 and ? T33 ?0of 0.25PMN-0.75PZT were higher than those of 0.2PMN-0.8PZT.

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