We report on numerical investigation of the electrocaloric effect, an important physical phenomenon in compositionally graded ferroelectric (CGFE) nanowires made of whose material compositions spatially vary along the longitudinal direction of nanowires. In this study, all numerical evidences are demonstrated through the phase field model based on the Ginzburg–Landau theory. Here, the change of polarization with temperature can be tailored by controlling the gradient of material compositions in CGFE nanowires. The isothermal entropy and adiabatic temperature changes are enhanced with an increasing compositional gradient in CGFE nanowires. The electrocaloric effect is found to have high magnitude near room temperature in CGFE nanowires of (top surface)/ (bottom surface), which is much larger than that in homogeneous ferroelectric nanowire with the same average material composition. In addition, the high electrocaloric effect in CGFE nanowires of is achieved in a wide range near room temperature. We also discuss the potential of CGFE nanowires for electrocaloric cooling applications, and more importantly, this work, in essence, opens a new route to enhance the electrocaloric properties of ferroelectric nanowires near room temperature by controlling the gradient of material compositions.
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7 June 2020
Research Article|
June 03 2020
Enhancement of electrocaloric effect in compositionally graded ferroelectric nanowires
Special Collection:
Multicalorics
Le Van Lich
;
Le Van Lich
a)
1
School of Materials Science and Engineering, Hanoi University of Science and Technology
, No. 1, Dai Co Viet Street, Hanoi 100000, Vietnam
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Ngoc-Lu Vu;
Ngoc-Lu Vu
1
School of Materials Science and Engineering, Hanoi University of Science and Technology
, No. 1, Dai Co Viet Street, Hanoi 100000, Vietnam
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Minh-Tan Ha;
Minh-Tan Ha
2
Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology
, Jinju-si 52851, South Korea
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Tinh Quoc Bui;
Tinh Quoc Bui
3
Department of Civil and Environmental Engineering, Tokyo Institute of Technology
, 2-12-1-W8-22, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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Van-Tuan Le;
Van-Tuan Le
4
School of Mechanical Engineering, Hanoi University of Science and Technology
, No. 1, Dai Co Viet Street, Hanoi 100000, Vietnam
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Trong-Giang Nguyen;
Trong-Giang Nguyen
1
School of Materials Science and Engineering, Hanoi University of Science and Technology
, No. 1, Dai Co Viet Street, Hanoi 100000, Vietnam
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Van-Hai Dinh
Van-Hai Dinh
1
School of Materials Science and Engineering, Hanoi University of Science and Technology
, No. 1, Dai Co Viet Street, Hanoi 100000, Vietnam
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a)
Author to whom correspondence should be addressed: lich.levan@hust.edu.vn and levanlichbk@gmail.com
Note: This paper is part of the Special Topic on Multicalorics.
J. Appl. Phys. 127, 214103 (2020)
Article history
Received:
January 14 2020
Accepted:
May 16 2020
Citation
Le Van Lich, Ngoc-Lu Vu, Minh-Tan Ha, Tinh Quoc Bui, Van-Tuan Le, Trong-Giang Nguyen, Van-Hai Dinh; Enhancement of electrocaloric effect in compositionally graded ferroelectric nanowires. J. Appl. Phys. 7 June 2020; 127 (21): 214103. https://doi.org/10.1063/1.5145040
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