Volume 117, Number 5, March 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 April 2017|
Inhomogeneous electric-field–induced negative/positive electrocaloric effects in ferroelectric nanoparticles
1 Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology - Hunan Xiangtan 411201, China
2 School of Materials and Engineering, Hunan University of Science and Technology - Hunan Xiangtan 411201, China
3 School of Materials and Engineering, Xiangtan University - Hunan Xiangtan 411105, China
4 China Three Gorges Corporation - Chengdu, Sichuan 610041, China
Received: 27 February 2017
Accepted: 4 April 2017
The electrocaloric effect in PbTiO3 ferroelectric nanoparticles has been studied using Landau-Ginzburg-Devonshire theory to determine the optimal electric field to induce large adiabatic temperature changes. The calculation results show that a large positive or negative adiabatic temperature change could be induced using an inhomogeneous electric field. The electrically induced negative adiabatic temperature change becomes positive as the strength of the electric field is increased. This transformation of the adiabatic temperature change is attributed to domain switching owing to the applied electric field. These results may provide an explanation for transformations from a negative to a positive electrocaloric effect in ferroelectrics.
PACS: 77.70.+a – Pyroelectric and electrocaloric effects / 77.80.Dj – Domain structure; hysteresis / 77.84.Cg – PZT ceramics and other titanates
© EPLA, 2017
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