The mechano-chemical synthesis and characteristics of PMN and PZT

Both PMN and PZT are perovskite oxides and typical functional materials applicable to various devices for its chemistry and physics properties. The conventional method solid-state reaction method has some drawbacks of high reaction temperature, large particle size and limited degree of chemical homogeneity. So, an easy, low cost and environmental method of synthesizing fine and homogenous powders is required. This paper discusses the synthesis of PMN and PZT by the new mechano-chemical method, the screw grinding method. Through experiments, it was found that the mechanism of mechano-chemical method and solid phase diffusion method were completely different, thus the pyrochlore phase was avoided, and the phase purity of powders was developed. And a higher power could greatly short the time of the mechano-chemical reaction time, improving the phase purity and the dispersion of the powder.