Large electrocaloric effect in two-step-SPS processed Pb(Sc0.25In0.25Nb0.25Ta0.25)O3 medium-entropy ceramics |
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| Affiliation: | 1. Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China;2. School of Advanced Materials and Nanotechnology, Xidian University, Xi''an, 710126, China;3. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin, 541004, China;4. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China;5. Basque Centre for Materials, Applications & Nanostructures, UPV/EHU Science Park, Barrio Sarriena s/n, 48940, Leioa, Spain;6. IKERBASQUE, Basque Foundation for Science, Plaza Euskadi, 5, Bilbao, 48009, Spain |
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| Abstract: | Ferroelectric ceramic with a large electrocaloric (EC) effect at a very low electric field is very attractive in the next solid state refrigeration technology. In this work, two Pb(Sc0.25In0.25Nb0.25Ta0.25)O3 (PSINT) medium-entropy ceramics were successfully synthesized by a spark plasma sintering (SPS) technology, including one-step-SPS processed and two-step-SPS processed samples. A large EC effect (△T ～ 0.85 K) with a high EC strength (△T/△E ～ 0.021 K cm/kV) around room temperature are obtained at a very low electric field (～40 kV/cm) in the two-step-SPS processed sample. Moreover, the working temperature range is very broad (～120 K), which can be responsible for the high relaxation degree of the dielectric peak. It can be believed that the PSINT medium-entropy ceramics can be promising candidates for application in the next-generation EC cooling devices. |
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| Keywords: | Electrocaloric effect High entropy Spark plasma sintering Relaxor |
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