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 T d ∼50°C and T S ∼100°C. Direct ECE measurements also reveal agreement and confirm the previously reported tendency of the high-field ECE peak to shift towards T S . The highest value of ECE, ΔT max ∼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.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the European Ceramic Society|
|State||Published - Sep 2019|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry