Giant negative electrocaloric effect over a broad temperature range in lead-free based Bi0.5(K0.15Na0.85)0.05TiO3 relaxor ferroelectric films
| Autor: | Qingshan Lu, Jieyu Chen, Shifeng Zhao, Zhehong Tang |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Mechanical Engineering Metals and Alloys Refrigeration 02 engineering and technology Dielectric Atmospheric temperature range 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Ferroelectricity Mechanics of Materials Electric field 0103 physical sciences Materials Chemistry Electrocaloric effect 0210 nano-technology Relaxor ferroelectric |
| Zdroj: | Journal of Alloys and Compounds. 756:62-67 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.05.017 |
| Popis: | Lead-free based Bi0.5(K0.15Na0.85)0.5TiO3 (BKNT15) films were deposited on Pt/Ti/SiO2/Si(100) substrates using a sol–gel technique. The microstructure, electric domain, dielectric relaxation, ferroelectric properties, and electrocaloric effect were investigated. The giant negative electrocaloric effect (ECE) was obtained over a broad temperature range with the maximum temperature change (ΔT) values reaching −16.55 K at working temperature of 303 K. So strong ECE is mainly attributed to high breakdown electric field and the large entropy change caused by the structural phase transition. As typical relaxation ferroelectric films, the giant negative electrocaloric effect enriches family of the electrocaloric effect, which is helpful to achieve good cooling effect in solid-state refrigeration at room temperature. |
| Databáze: | OpenAIRE |
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