The crystalline and dielectric properties of (1−x)Pb(Sc1/2Ta1/2)O3–(x)PbTiO3 ceramics prepared by one-step-sintering-method

The solid solutions of lead scandium tantalate–lead titanate, (1−x)Pb(Sc1/2Ta1/2)–xPbTiO3 (PSTT(x)) were synthesized by a conventional mixed-oxide method (or named as one-step-sintering-method) using lower sintering temperature (1200–1300 °C). The experimental results showed the percent of the perovskite phase of the PSTT(x) ceramics could be as high as 90%, the highest was up to 100%. The SEM observation showed the crystalline grains were dense and well-stacked, and the grain boundaries were well clear. It was found that the Curie temperature Tc of the PSTT(x) ceramics synthesized by one-step-sintering-method were usually higher than that of the references reported. The thermal hysteretic temperature ΔTc were changed from 6 to 12 °C with different x concentration, and the Curie constants c∗ were 3.7–(8.3×106)K2.