Large electrocaloric effect in two-step-SPS processed Pb(Sc0.25In0.25Nb0.25Ta0.25)O3 medium-entropy ceramics. Issue 11 (1st June 2022)

• Record Type: Journal Article
• Authors: Wei, Siyue; Chen, Xue; Dong, Guangzhi; Liu, Laijun; Zhang, Qi; Peng, Biaolin
• Is Part Of: Ceramics international. Volume 48:Issue 11(2022)
• Page Start: 15640
• Page End: 15646
• Publication Date: 2022-06-01
• Subjects: Electrocaloric effect -- High entropy -- Spark plasma sintering -- Relaxor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.02.098
• Languages: English
• ISSNs: 0272-8842

Abstract

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(Sc0.25 In0.25 Nb0.25 Ta0.25 )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.