Electrocaloric Effect in Sn‐ and Y‐Codoped BaTiO₃ Ceramics.

Qiang, Hua; Fu, Shiwen; Xu, Zunping

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.

PYROELECTRICITY; DIELECTRIC properties; CERAMICS; CRYSTAL grain boundaries; MAGNETOCALORIC effects; DOPING agents (Chemistry); ELECTRIC fields

Physica Status Solidi. A: Applications & Materials Science, 2021, Vol 218, Issue 15, p1

1862-6300

Academic Journal

10.1002/pssa.202100090