Abstract
(Ba 0.7 Pb 0.3 )TiO 3 and (Ba 0.4 Pb 0.6 )TiO 3 materials possessing double critical temperature (T c ) and single high-T c in resistivity-temperature (p-T) behavior, respectively, were obtained by microwave sintering at 1050°C for 5 minutes. These characteristics were ascribed to the existence of the dual phases with core-shell structure. The cooling-rate control modified the relative magnitude of low-T c and high-T c resistivity jumps, without altering the T c -values. It occurred via the change in relative proportion of the core and shell phases.