Single-Calcination Synthesis of Pyrochlore Free Pb(Mg_(1/3)Nb_(2/3))O_3 Powders Using Particle-Coating Method

摘要

Using two-step particle-coating method, pyrochlore-free Pb(Mg_(1/3)Nb_(2/3))O_3 (PMN) powders have been successfully synthesized by a single calcination step at a relatively lower calcined temperature of 850℃. The XRD and EDS results confirmed that the Mg-citric acid polymeric complex coatings effectively prevent direct contact between PbO and Nb_2O_5 and thus avoid the formation of pyrochlore phase. The coated powders were calcined directly without the ball-milling procedure at 850℃. The pyrochlore-free PMN powders obtained showed uniform and even grain size. The results showed that this method is an attractive method for the synthesis of PMN-based composite powders.