Study of microstructure and dielectric properties of PMN-PZT ceramics via a mixed powder method including sol-gel precursor

摘要

An attempt to synthesize pyrochlore free (x)PMN-(1 -x)PZT ceramics (where x is 0, 0.1, 0.3, 0.5,0.7, 0.9, and 1) by a mixed powder method was made. In this work, a sol-gel prepared PZT powder was mixed with the mixture of milled PbO, MgO and Nb_2O_5, and sintered in a two step sintering process. The produced samples with high PZT content showed low densities due to the low compaction ratio of PZT powder. The dielectric properties of PZT-rich and PMN-rich materials were high (with dielectric constant of about 19,000 and 33,000 for PZT-rich and PMN-rich ceramics, respectively) while the other samples exhibited low dielectric properties. Also, the effect of combining PMN with PZT on Curie temperature was studied.