Dielectric Properties of Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 Ceramics Modified by Pb(Mg_(1/3)Ta_(2/3))O_3

摘要

Ferroelectric 0.8Pb(MgMg_(1/3)Nb_(2/3))O_3 ceramics modified by Pb(Mg_(1/3)Ta_(2/3))O_3 (5,10 and 20 mol percent) were prepared by two-stage columbite method. The phase compositions and dielectric properties for these ceramics were investigated. The results showed that pure perovskite phase were obtained for all the specimens, and the ceramic with 10 mol percent Pb(Mg_(1/3)Ta_(2/3))O_3 substitution has better dielectric properties (e ~ 6500 and epsilon_m ~57000). However, with Pb(Mg_(1/3)Ta_(2/3))O_3 additives increasing, the frequency dispersion is more obvious, and the degree of dielectric relaxor behavior is increasing.