The primary and secondary electrocaloric effect at ferroelectric-ferroelectric transitions in lead-free ceramics. (15th March 2020)

• Record Type: Journal Article
• Authors: Wang, Haoyu; Zhang, Le; Sun, Yunlong; Cazorla, Claudio; Guo, Mengyao; Li, Ying; Lam, Kwok Ho; Lou, Xiaojie; Wang, Danyang
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 150
• Page End: 154
• Publication Date: 2020-03-15
• Subjects: Primary electrocaloric effect -- Secondary electrocaloric effect -- Phonon vibrational entropy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.11.014
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Secondary electrocaloric effect (ECE) arising from piezoelectricity combined with crystal thermal expansion was often overlooked in ECE studies of ferroelectric ceramics. This work mainly evaluated the primary ECE (ΔTECE ) and secondary ECE (∆T2 ) of eco-friendly BaSn x Ti 1 - x O3 (BSnT100 x, 0 < x < 12%) ceramics near the tetragonal (T)-orthorhombic (O) transition. Intriguingly, a maximum overall ΔT ~ 0.85 K was obtained at the T-O transition (~300 K) of BSnT2 under an electric field of 2 kV/mm, with ∆TECE and ∆T2 amounting to ~0.75 K, ~0.1 K, respectively. This ECE result is ~40% superior than the larger ECE reported previously for BSnT system. Graphical abstract: Image, graphical abstract