Dielectric properties and electrocaloric effect of yttrium-modified BaTiO3 ceramics. Issue 13 (1st July 2021)

• Record Type: Journal Article
• Authors: Zhao, Ye; Wang, Qian; Lv, Jun-Hu; Zhao, Xian; Wang, Chun-Ming
• Is Part Of: Ceramics international. Volume 47:Issue 13(2021)
• Page Start: 18610
• Page End: 18618
• Publication Date: 2021-07-01
• Subjects: Electrocaloric effect (ECE) -- Barium titanate -- Relaxor ferroelectrics; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.03.192
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The electrocaloric effect (ECE) is a promising candidate to replace the vapor-compression cooling technology, which has reached its end of improving the energy utilization efficiency. In the present work, the Y-modified BaTiO3 ceramics with nominal compositions of Ba(Ti1- x Y x )O3 (abbreviated as BT-100 x Y, where x = 0.0125, 0.025, 0.0375, 0.050 and 0.0625) have been prepared through the conventional solid-state reaction sintering method. The dielectric properties and electrocaloric effect of BT-100 x Y ceramics have been investigated in detail. The XRD patterns indicate that all the BT-100 x Y ceramics possess pure perovskite structure without secondary phases. The temperature dependence of dielectric permittivity reveals that the BT-1.25Y, 2.5Y, 3.75Y and 5.0Y are normal ferroelectrics, and the BT-6.25Y is a relaxor ferroelectric. The ECE is calculated through the indirect equation based on Maxwell relation. The BT-2.5Y exhibits the largest ΔT = 1.26 K and the largest ΔS = 1.68 J/kg · K among all the BT-100 x Y ceramics, and the BT-2.5Y also exhibits the largest ΔT/ΔE = 0.296 × 10 −6 K · m/V and the largest ΔS/ΔE = 0.394 × 10 −6 J · m/kg · K∙V. The ECE in our work is comparable with or even larger than that of BaTiO3 -based ceramics previously reported, which indicates that the BT-100 x Y ceramics are promising ECE materials.