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

Haoyu Wang,Le Zhang,Yunlong Sun,Claudio Cazorla,Mengyao Guo,Ying Li,Kwok Ho Lam,Xiaojie Lou,Danyang Wang

doi:10.1016/j.scriptamat.2019.11.014

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

Haoyu Wang, Le Zhang + Show 7 more

https://doi.org/10.1016/j.scriptamat.2019.11.014

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Journal: Scripta materialia	Publication Date: Nov 18, 2019
Citations: 9

Affiliation: UNSW Sydney, Materials Science & Engineering, Xi'an Jiaotong University, Hong Kong Polytechnic University

#Electrocaloric Effect #Crystal Thermal Expansion + Show 8 more

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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.

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