Synergy of ferroelectric-relaxor transition and multiphase coexistence induced high electrocaloric effect with wide temperature span in Pb0.7Ba0.3ZrO3-based system. (1st July 2022)

• Record Type: Journal Article
• Authors: Liu, Wei; Li, Feng; Chen, Guohua; Li, Guohui; Zhai, Jiwei; Long, Mingsheng; Wang, Chunchang; Shan, Lei
• Is Part Of: Scripta materialia. Number 215(2022)
• Publication Date: 2022-07-01
• Subjects: Electrocaloric effect -- Ferroelectric ceramics -- Phase transformation -- Dielectrics; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114713
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In this work, (1- x )Pb0.7 Ba0.3 ZrO3 – x Bi(Mg0.5 Ti0.5 )O3 (PBZ– x BMT) compositions was designed with an integration of ferroelectric–relaxor transition and multiphase coexistence to synergistically optimize electrocaloric effect (ECE) and temperature stability. Rietveld refinements reveal a phase structure change with sequence of R3cH → R3cH + Pm 3 ¯ m → Pm 3 ¯ m as BMT content increases, whilst relaxation property also increases with downshift in ferroelectric–relaxor transition temperature. Structural evolution is also verified by in-situ Raman spectra and ferroelectric measurements. Interestingly, a large ECE (Δ T ∼ 0.86 K) with a broad temperature span (Δ T span ∼ 58 K) was successfully obtained in x =0.01 composition, which is believed to be contributed by diffuse phase transition character with multiphase coexistence. This work provides a guideline to exploring ferroelectric materials with high ECE/wide operation span and the reported PBZ–based ceramics with a large Δ T and Δ T span is a promising candidate in application of solid–state cooling devices. Graphical abstract: Image, graphical abstract .