Preparations and Characterizations of Perovskite PMN Ceramics by Using a One-Step Calcination Method
A relaxor ferroelectric material, Pb(Mg1/3Nb2/3)O3 (PMN) powder with a pyrochlore-free phase, was prepared by using a one-step calcinations method. The pyrochlore phase was prevented by coating Mg(OH)2 on Nb2O5 particles. Pure-perovskite PMN powder was synthesized by a single calcination of the coating powder mixed with appropriate amounts of PbO at 900 oC for 2 h. The pyrochlore-free perovskite PMN powders were sintered to 96.9% density at 1100 oC. The sintered PMN ceramics exhibited a dielectric constant maximum of ~11 700 at room temperature at a frequency of 1 kHz.
Young Won Chang, Nack J. Kim and Chong Soo Lee
J. Chen et al., "Preparations and Characterizations of Perovskite PMN Ceramics by Using a One-Step Calcination Method", Advanced Materials Research, Vols. 26-28, pp. 255-258, 2007