Electrocaloric effect and pyroelectric properties of organic-inorganic hybrid (C2H5NH3)2CuCl4

doi:10.1088/1674-1056/ab48db

Abstract The organic-inorganic hybrid (C₂H₅NH₃)₂CuCl₄ (EA₂CuCl₄) single crystals are prepared by the solvothermal condition method. The x-ray diffraction, scanning electron microscopy, dielectric permittivity, pyroelectric current, and heat capacity are used to systematically investigate the electrocaloric performances of EA₂CuCl₄. The pyroelectric currents are measured under various voltages, and the electrocaloric effect (ECE) is calculated. Its ECE exhibits an isothermal entropy change of 0.0028 J/kg·K under an electric field of 30 kV/cm associated with a relatively broad temperature span. Further, the maximum pyroelectric coefficient (p) is 4×10^-3 C/m²·K and the coefficient β for generating ECE from electric displacement D is 1.068×10⁸ J·cm·K^-1·C^-2 at 240 K. Our results indicate that the ECE behavior of organic-inorganic hybrid EA₂CuCl₄ is in accordance with Jona and Shirane's opinion in which the ECE should occur both below and above the Curie temperature T_c.

Keywords: electrocaloric effect pyroelectric properties organic-inorganic perovskite

Received: 25 March 2019
Revised: 09 September 2019
Accepted manuscript online:

PACS:	77.70.+a	(Pyroelectric and electrocaloric effects)
	77.55.-g	(Dielectric thin films)
	81.07.Pr	(Organic-inorganic hybrid nanostructures)

Fund: Project supported by the Fujian Institute of Innovation, Chinese Academy of Sciences (Grant No. FJCXY18040303), the Youth Innovation Promotion of the Chinese Academy of Sciences (Grant No. 2013004), and the National Natural Science Foundation of China (Grant Nos. 51676198 and 51771067).

Corresponding Authors: Li-Qin Yan, Zun-Ming Lu
E-mail: lqyan@iphy.ac.cn;luzunming@hebut.edu.cn

Cite this article:

Yi Liu(刘义), Yan-Fen Chang(畅艳芬), Young Sun(孙阳), Jun Shen(沈俊), Li-Qin Yan(闫丽琴), Zun-Ming Lu(卢遵铭) Electrocaloric effect and pyroelectric properties of organic-inorganic hybrid (C₂H₅NH₃)₂CuCl₄ 2019 Chin. Phys. B 28 117701

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Electrocaloric effect and pyroelectric properties of organic-inorganic hybrid (C2H5NH3)2CuCl4

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Electrocaloric effect and pyroelectric properties of organic-inorganic hybrid (C₂H₅NH₃)₂CuCl₄