Enhanced Electrocaloric Effects in Spark Plasma‐Sintered <scp> <scp>Ba</scp> </scp> _0.65 <scp> <scp>Sr</scp> </scp> _0.35 <scp> <scp>TiO</scp> </scp> ₃ ‐Based Ceramics at Room Temperature

Abstract

Improvement of electrocaloric effect was investigated in the lead‐free undoped and Mn ‐doped Ba 0.65 Sr 0.35 TiO 3 ceramics prepared by spark plasma sintering process. Owing to the merit of spark plasma sintering process, a fully dense undoped and Mn ‐doped Ba 0.65 Sr 0.35 TiO 3 ceramics with fine grain sizes could be obtained. The electrocaloric ( EC ) effect can be significantly enhanced from 0.83 K for conventional sintered Ba 0.65 Sr 0.35 TiO 3 to 3.08 K for spark plasma‐sintered Mn ‐doped Ba 0.65 Sr 0.35 TiO 3 ceramics since the dielectric strength was dramatically increased. This work indicated an effective way to achieve the significantly enhanced EC effect in a lead‐free system at room temperature.