Abstract
Lead-based ferroelectric compounds with a cubic perovskite structure exhibit a high dielectric constant, a relatively low firing temperature, and a diffuse ferroelectric-paraelectric phase transition. Smolenskii et al. proposed that the distribution of two kinds of cations on equivalent crystallographic positions causes a statistical compositional fluctuation forming microdomains with different Curie temperatures which contribute to a broad phase transition through a wide temperature range. Therefore, the diffuse phase transition is largely influenced by the degree in which the cations are ordered on the B-site sublattice. The purpose of the present work is to study the ordered structure of Pb(Mg⅓Nb⅔)O3 ceramics by means of selected area diffraction (SAD) and high-resolution transmission electron microscopy (HRTEM). To get detailed information on the ordered structure, computer image simulations were also performed using a multislice method.
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