Multilayer 0.9Pb(Mg_1/3Nb_2/3)O₃-0.1PbTiO₃ elements for electrocaloric cooling

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• 作者：Lovro Fulanović^a ; ^b ; ^{lovro.fulanovic@ijs.si" class="auth_mail" title="E-mail the corresponding author} ; Silvo Drnov&scaron ; ek^a ; ^b ; Hana Ur&scaron ; ič^a ; ^b ; Marko Vrabelj^a ; ^b ; Danjela Ku&scaron ; čer^a ; ^b ; Kostja Makarovič^a ; ^c ; Vid Bobnar^a ; ^b ; Zdravko Kutnjak^a ; ^b ; Barbara Malič^a ; ^b
• 关键词：PMN-PT ; Electrocaloric effect ; Multilayer ; Tape casting ; Microstructure
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：599-603
• 全文大小：1322 K

文摘

Electrocaloric (EC) cooling elements in the form of multilayers (MLs) were prepared. The elements consist of five layers of the relaxor-ferroelectric 0.9Pb(Mg_1/3Nb_2/3)O₃–0.1PbTiO₃, about 60 μm thick, with internal platinum electrodes and exhibiting a dense, uniform microstructure with a grain size of 1.7 μm. The largest temperature change ΔT_EC of 2.26 K was achieved at an electric field (E) of 100 kV cm⁻¹ and at 105 °C, measured by a high-resolution calorimeter. These results agree well with the indirect measurements. The EC coefficient, ΔT_EC/ΔE, obtained for the MLs, is similar to the value obtained for bulk ceramics of the same composition. The ΔT_EC values above 2 K over a broad temperature range from 75 to 105 °C make the ML elements suitable candidates for EC cooling devices at significantly lower voltages than bulk ceramic plates with comparable dimensions and mass.