Direct measurement of electrocaloric effect in lead-free (Na0.5Bi0.5)TiO3-based multilayer ceramic capacitors
| Autor: | Neil McN. Alford, Amanda Baker, Florian Le Goupil, Andrey Berenov, Clive A. Randall, Florent Tonus |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Tape casting Materials science Dielectric permittivity 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences visual_art Electric field 0103 physical sciences Materials Chemistry Ceramics and Composites Breakdown strength Electrocaloric effect visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology Ceramic capacitor Lead (electronics) |
| Zdroj: | Journal of the European Ceramic Society. 39:3315-3319 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2019.04.032 |
| Popis: | Multilayer ceramic capacitors (MLCCs) of lead-free NBT-based ceramics are produced and their electrocaloric effect (ECE) is characterised for the first time. Dense MLCCs with 97μm-thick active layers are successfully produced by tape casting. Dielectric permittivity measurements reveal the MLCCs to have properties similar with that reported for the corresponding bulk ceramics, including Td∼50°C and TS∼100°C. Direct ECE measurements also reveal agreement and confirm the previously reported tendency of the high-field ECE peak to shift towards TS. The highest value of ECE, ΔTmax∼1.7K is measured at 90°C under 90kV/cm. A low breakdown strength of 93kV/cm needs to be solved to realise stronger electric fields and achieve commercially viable ECE values. |
| Databáze: | OpenAIRE |
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