Li, F;
Lu, B;
Zhai, J;
Shen, B;
Zeng, H;
Lu, S;
Viola, G;
(2018)
Enhanced piezoelectric properties and electrocaloric effect in novel lead‐free (Bi₀.₅K₀.₅)TiO₃‐La(Mg₀.₅Ti₀.₅)O₃ ceramics.
Journal of the American Ceramic Society
, 101
(12)
pp. 5503-5513.
10.1111/jace.15812.
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Abstract
The crystal structure, electromechanical properties, and electrocaloric effect (ECE) in novel lead‐free (Bi0.5K0.5)TiO3‐La(Mg0.5Ti0.5)O3 ceramics were investigated. A morphotropic phase boundary (MPB) between the tetragonal and pseudocubic phase was found at x = 0.01‐0.02. In addition, the relaxor properties were enhanced with increasing the La(Mg0.5Ti0.5)O3 content. In situ high‐temperature X‐ray diffraction patterns and Raman spectra were characterized to elucidate the phase transition behavior. The enhanced ECE (ΔT = 1.19 K) and piezoelectric coefficient (d33 = 103 pC/N) were obtained for x = 0.01 at room temperature. Meanwhile, the temperature stability of the ECE was considered to be related to the high depolarization temperature and relaxor characteristics of the Bi0.5K0.5TiO3‐based ceramics. The above results suggest that the piezoelectric and ECE properties can be simultaneously enhanced by establishing an MPB. These results also demonstrate the great potential of the studied systems for solid‐state cooling applications and piezoelectric‐based devices.
| Type: | Article |
|---|---|
| Title: | Enhanced piezoelectric properties and electrocaloric effect in novel lead‐free (Bi₀.₅K₀.₅)TiO₃‐La(Mg₀.₅Ti₀.₅)O₃ ceramics |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1111/jace.15812 |
| Publisher version: | https://doi.org/10.1111/jace.15812 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Bi0.5K0.5TiO3 ceramic, dielectric relaxor, electrocaloric effect, lead‐free, piezoelectric |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10112607 |
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