Enhanced ferroelectric and electrocaloric properties in CuO-modified lead-free (Na0.5K0.5)NbO3 ceramics for solid-state cooling application
| Autor: | Satyendra Singh, Nitika Sharma, Saarthak Kharbanda, Roopam Gaur |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Ferroelectric ceramics Doping Analytical chemistry 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ferroelectricity Mechanics of Materials visual_art Electric field 0103 physical sciences Electrocaloric effect visual_art.visual_art_medium General Materials Science Ceramic 0210 nano-technology Adiabatic process |
| Zdroj: | Materials Science and Engineering: B. 261:114767 |
| ISSN: | 0921-5107 |
| DOI: | 10.1016/j.mseb.2020.114767 |
| Popis: | Lead-free (Na0.5K0.5)NbO3: x mol. % CuO (abbreviated as NKN-xCu) ferroelectric ceramics with x = 0, 0.5, 1.0 and 2.0 were synthesized by the conventional solid-state reaction method and the correlation of structure, dielectric, ferroelectric, and electrocaloric (EC) properties was investigated. The orthorhombic‐tetragonal and tetragonal–cubic transition temperatures of NKN-xCu ceramics decreased with an increase in CuO doping level. The ferroelectric loops and saturation polarization values were improved with the CuO addition. A large adiabatic temperature change (ΔT) of ~1.98 K and corresponding EC strength (ΔT/ΔE) of ~0.49 K.mm/kV were achieved at the electric field of 40 kV/cm at 450 K for x = 2.0. The higher EC response makes NKN-xCu ceramics highly promising for environmentally-friendly electrocaloric effect (ECE) based solid-state cooling application. |
| Databáze: | OpenAIRE |
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