【摘要】 运用XRD、SEM、TEM、XPS等实验手段,研究了烧结温度对0.05PMnN-0.95PZT (PMnN—PZT)压电陶瓷微观结构、压电性能及锰元素价态的影响.实验结果显示:随烧结温度的降低平均晶粒尺寸减小,四方度也随之减小;机电耦合系数(kp)随烧结温度的升高而提高, 而机械品质因子(Qm)却呈波浪状变化. XPS及TEM实验分析证明:PMnN—PZT陶瓷在烧结过程中出现明显的液相烧结和成分偏离,低温烧结诱导了Mn2+的出现,产生更多的氧空位,从而使低温烧结下的样品Qm值不致降低.更多还原

【Abstract】 The microstructure and the piezoelectric properties as well as the valency of Mn in Pb[(Zr0.52Ti0.48)0.95(Mn1/3Nb2/3)0.05]03 (PMnN-PZT) ceramics sintered at different temperatures from 1070℃ to 1280℃ were investigated by XRD, SEM, TEM, XPS. The experimental results suggest that grain sizes, tetragonality and kp of the ceramics increase with the increase of sintering temperature, and Qm fluctuates with the increase of sintering temperature. The obtained results by X-ray photoelectron spectrum and TEM suggest that there exist apparently the liquid phase of PbO and stoichiometric composition departure during the sintering. Low temperature induces the existence of the Mn2+, producing more oxygen vacancies, and therefore the fluctuation of mechanical quality factor (Qm) with the sintering temperature occurs.更多还原