Chin. Phys. Lett.  2018, Vol. 35 Issue (3): 037701    DOI: 10.1088/0256-307X/35/3/037701
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Elastocaloric Effect in PbTiO$_{3}$ Thin Films with 180$^{\circ}$ Domain Structure: A Phase Field Study
Fang Wang1,3, Bo Li2**, Yun Ou1,3, Long-Fei Liu1,3**, Wei Wang4
1Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201
2School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105
3School of Materials and Engineering, Hunan University of Science and Technology, Xiangtan 411201
4China Three Gorges Corporation, Chengdu 610041
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Fang Wang, Bo Li, Yun Ou et al  2018 Chin. Phys. Lett. 35 037701
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Abstract The elastocaloric effect of PbTiO$_{3}$ thin films with 180$^{\circ}$ domain structure is studied using the phase field method. The influence of external stress $\sigma_{33}$, misfit strain $u_{\rm m}$ and domain wall energy on the adiabatic temperature change ($\Delta T_{\sigma})$ at room temperature are carried out. The calculation results indicate that $|{\Delta T_\sigma}|$ increases as $|{\sigma_{33}}|$ or $|{u_{\rm m}}|$ increases. The largest $\Delta T_{\sigma}$ value of $-$7.8 K is obtained at $\sigma_{33}=2$ GPa and $u_{\rm m}=-0.02$. Furthermore, the domain switching behaviors under different gradient coefficients are different, and finally affect the elastocaloric effect in PTO thin films. These results could provide a guide to choose the substrate and the preparation process in experiments.
Received: 22 September 2017      Published: 25 February 2018
PACS:  77.70.+a (Pyroelectric and electrocaloric effects)  
  77.80.Dj (Domain structure; hysteresis)  
  77.84.Cg (PZT ceramics and other titanates)  
Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11502078 and 11402222, the General Project of Hunan Provincial Department of Education under Grant No 15C0535, and the Start-up Foundation of High-talent Research Project of Hunan University of Science and Technology under Grant No E51517.
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https://cpl.iphy.ac.cn/10.1088/0256-307X/35/3/037701       OR      https://cpl.iphy.ac.cn/Y2018/V35/I3/037701
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Fang Wang
Bo Li
Yun Ou
Long-Fei Liu
Wei Wang
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