Electrocaloric Effect in Sn‐ and Y‐Codoped BaTiO₃ Ceramics

Abstract

BaSnxTi1–xO3 + 0.5 mol% Y ceramics (x = 0.06, 0.08, 0.11, and 0.13) are synthesized using citrate combustion technique and the electrocaloric effect (ECE) is investigated. Dense microstructures with fine grain are observed as increasing Sn contents. The dielectric results reveal that TO–T (tetragonal‐to‐orthorhombic phase) shifts toward higher temperature, whereas TC (cubic‐to‐tetragonal phase) shifts toward lower temperature as increasing Sn, and TO–T merges with TC at x = 0.11. An improving EC temperature change accompanying with large electrocaloric efficiency (ΔT/ΔE) of 0.28 × 10−6 K mV−1 over a wide temperature span is obtained at x = 0.11 under electric field of 50 kV cm−1. The enhanced ECE is mainly attributed to the multiphase coexistence. The dielectric properties and the grain boundary resistance are enhanced by optimizing Sn doping contents.

Enhanced Energy Storage Properties of Bi(Mg0.5Zr0.5)O3 Modified Ba0.9Sr0.1TiO3 Ceramics

“…Lots of methods have been adopted to improve the energy storage properties, such as ions doping, [ 11–15 ] optimizing process, [ 16–18 ] and the introduction of liner additive. [ 19–22 ] Very recently, different liner additives have been introduced to form solid solutions. Such as BaTiO 3 ‐based ceramics modified by Bi(Mg 1/2 Zr 1/2 )O 3 show optimal W re of 1.25 J cm −3 and η of >95%.…”