Enhanced electrocaloric effect of relaxor potassium sodium niobate lead-free ceramic via multilayer structure. (1st March 2021)

• Record Type: Journal Article
• Authors: Yang, Junlin; Zhao, Ye; Zhu, Lipeng; Hao, Xihong
• Is Part Of: Scripta materialia. Number 193(2021)
• Page Start: 97
• Page End: 102
• Publication Date: 2021-03-01
• Subjects: Electrocaloric effect -- Multilayer ceramic capacitor -- KNN-based ceramic -- Direct measurement; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.10.034
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Herein, 0.9(K0.49 Na0.49 Li0.02 )(Nb0.8 Ta0.2 )O3 –0.1CaZrO3 (KNLNT–0.1CZ) relaxor system in multilayer ceramic capacitor (MLCC) are designed to attain elevated electrocaloric effect (ECE). Based on direct measurement, a large ∆ T of 2.45 K is achieved in KNLNT–0.1CZ MLCC, which is nearly 10 times higher than that of ceramic counterpart. The temperature span ( Tspan ) on a benchmark of ∆T above 1.5 K come up to 65 °C. Such excellent ECE benefits by synergistic effect of relaxor phase transition and high electric field. This study shed light a strategy on designing new ECE materials with large ∆T and wide Tspan for solid-state cooling. Graphical abstract: Image, graphical abstract