PbO对Pb(Zr0.52Ti0.48)O3陶瓷相成分的影响

采用固相反应法制备了一系列Pb(Zr0.52Ti0.48)O3压电陶瓷,研究了过量PbO对PZT陶瓷相成分的影响.用X射线衍射对陶瓷的相结构进行了分析,采用场发射扫描电镜对断面形貌进行表征,并用能谱仪对微观区域的陶瓷成分进行测试.实验结果表明:当PbO缺乏时,陶瓷上表面易出现由PbZrO3分解产生的ZrO2,下表面易出现PbTi3O7和焦绿石相.当PbO过量时,陶瓷微观区域的成分会发生波动,成分的一致性也将受到破坏.此外,过量PbO还将使PZT相结构发生向富钛方向的移动.采用先进的陶瓷制备工艺有助于克服成分波动和相结构变化现象.

Effects of PbO content on phase composition of Pb(Zr0.52Ti0.48)O3 ceramics

A series of Pb(Zr0.52Ti0.48)O3 ceramics were prepared by traditional solid-phase reactive sintering.Effects of PbO content on phase composition of these ceramics were studied.The phase compositions were examined by X-Ray Diffractory.The cross-section morphology was characterized by Field-emission Scanning Electron Microscope.The compositions of the ceramics were tested by Energy Dispersive X-ray Analysis.It was concluded that when PbO was scarce,ZrO2 caused by the decomposition of PbZrO3 might appear on the top surface of ceramics,and PbTi3O7 and pyrochlore might appear at the undersurface of ceramics.However,excess PbO would make the ceramic composition vary in local area;therefore degrade the homogeneity of ceramics.Moreover,excess PbO would make the phase composition of PZT shift towards the Ti-lean side.Adopting advanced ceramic preparation technique could overcome the shortcomings of compositional fluctuation and phase variation.