水热条件对溶胶-水热法合成PZT陶瓷粉体的影响

Influence of Hydrothermal Conditions on PZT Ceramic Powder Synthesized by Sol-Hydrothermal Method

采用溶胶-水热法,合成了具有单一钙钛矿结构的PbZr_(1-x)Ti_xO_3反铁电陶瓷粉体,探讨了水热反应温度和反应时间对PZT粉体的结晶过程、晶体结构、微观形貌等的影响。实验发现,随着水热反应温度的升高或者水热反应时间的延长,溶胶-水热反应的产物由非晶态向晶态逐步过渡。当水热反应温度达到180℃,反应时间高于18 h时,合成了立方形貌、结晶良好且具有钙钛矿结构的PZT陶瓷粉体。继续升高水热反应温度或者延长水热反应时间,PZT陶瓷粉体XRD衍射峰的峰强增强,峰位不变。但进一步升高水热反应温度时,PZT粉体的粒径尺寸增加明显。而进一步延长水热反应时间,PZT陶瓷粉体的粒径尺寸略有增加。由此,实验确定,本研究中溶胶-水热法合成PZT反铁电陶瓷粉的最佳水热条件为:水热反应温度为180℃,反应时间为18 h。

PbZr1-xTixO3 anti-ferroelectric ceramic powder with perovskite structure were synthesized by sol-hydrothermal method, and the influence of hydrothermal reaction temperatures and reaction times on crystallization, crystalline, microstructure were discussed. Experimental results illustrate that with the increasing of hydrothermal temperature T1 or the prolonging of hydrothermal reaction time , the products of sol hydrothermal reaction is gradually change from amorphous to crystalline. When T1 is 180 ℃ and is 18 h, PZT ceramic powder with cubic morphology and perovskite structure are prepared. XRD diffraction peak of the PZT ceramic powder is enhance and the peak position is unchange when T1 is prolonge or is prolong. However, the particle size of PZT powder increase obviously when T1 increase and slightly increase by prolonging T1. Therefore, the optimum hydrothermal conditions for the synthesis of PZT antiferroelectric ceramic powders by sol hydrothermal method in this experimental are ascertained as follows： the hydrothermal reaction temperature is 180 ℃ and the reaction time is 18 h.