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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.
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Liu et al. (2013) studied this question.
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