The primary and secondary electrocaloric effect at ferroelectric-ferroelectric transitions in lead-free ceramics

Wang, H., Zhang, L., Sun, Y., Cazorla, C., Guo, M., Li, Y., Lam, K. H. , Lou, X. and Wang, D. (2020) The primary and secondary electrocaloric effect at ferroelectric-ferroelectric transitions in lead-free ceramics. Scripta Materialia, 178, pp. 150-154. (doi: 10.1016/j.scriptamat.2019.11.014)

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 BaSnxTi1-xO3 (BSnT100x, 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lam, Dr Koko
• Authors: Wang, H., Zhang, L., Sun, Y., Cazorla, C., Guo, M., Li, Y., Lam, K. H., Lou, X., and Wang, D.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Scripta Materialia
• Publisher: Elsevier
• ISSN: 1359-6462