Volume 115, Number 4, August 2016
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||28 September 2016|
Negative/positive elastocaloric effect associated with vortex domain in the Bi4Ti3O12 ferroelectric nanoparticle
1 School of Materials and Engineering, Xiangtan University - Hunan Xiangtan 411105, China
2 Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology - Hunan Xiangtan 411201, China
3 China Three Gorges Corporation - Chengdu, Sichuan 610041, China
Received: 17 August 2016
Accepted: 12 September 2016
The elastocaloric effect in the Bi4Ti3O12(BIT) ferroelectric nanoparticle with vortex domain structure was studied using a phase field simulation in this work. A transformation from the negative elastocaloric effect to positive elastocaloric effect which is associated with vortex domain structure is found under the uniaxial stress in the BIT nanoparticle. In addition, the negative adiabatic temperature change is found under the biaxial compressive stress, and the positive adiabatic temperature change is found under the biaxial tensile stress. The results of this study provide an explanation of the mechanism of the negative/positive elastocaloric effect in the low-dimensional ferroelectrics from the viewpoint of the domain structure.
PACS: 77.70.+a – Pyroelectric and electrocaloric effects / 77.22.Ej – Polarization and depolarization / 77.84.Cg – PZT ceramics and other titanates
© EPLA, 2016
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