Phase transition and linear thermal expansion of (Pb1− x Ba x )ZrO3 ceramics

Abstract

(Pb1− x Ba x )ZrO3 ceramics for the composition range 0 ≤ x ≤ 0.30 were prepared by the mixed oxide solid state reaction method. Phase transition was studied by dielectric and dilatometric measurements. The ferroelectric to paraelectric phase transition temperature was progressively shifted to a lower temperature by replacing lead with barium. The x = 0.20 sample showed the maximum dielectric constant of 16,300 at the transition temperature. For compositions 0 ≤ x ≤ 0.075, the antiferroelectric to ferroelectric phase transition exhibited a large linear thermal expansion. However, the antiferroelectric to ferroelectric phase transition did not exist for 0.10 ≤ x ≤ 0.30 samples. A phase diagram for PBZ ceramics prepared by the conventional mixed oxide method was also present.