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Giant Negative Electrocaloric Effect in (Pb,La)(Zr,Sn,Ti)O3 Antiferroelectrics Near Room Temperature
Fangping Zhuo, Qiang Li, Jinghan Gao
1Department of Mechanical and Aerospace Engineering , Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong , China.
Abstract:
(Pb0.97La0.02)(Zr xSn0.94- xTi0.06)O3 (PLZST) antiferroelectric ceramics with x = 0.75-0.90 have been fabricated and found to be a novel electrocaloric material system with a giant negative electrocaloric effect (Δ T = -11.5 K) and a large electrocaloric strength (|Δ T/Δ E| = 0.105 K cm kV-1) near room temperature. Additionally, the PLZST antiferroelectric ceramic also exhibits a large positive electrocaloric effect around the Curie temperature. The giant negative effect and the coexistence of both positive and negative electrocaloric effects in one material indicate a promising possibility to develop mid- to large-scale solid-state cooling devices with high efficiency.
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