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. 2024 Jun 3;63(23):e202405514.
doi: 10.1002/anie.202405514. Epub 2024 May 2.

High-performance Pyroelectric Property Accompanied by Spin Crossover in a Single Crystal of Fe(II) Complex

Chengdong Liu  1 , Yun Li  2 , Zheng Tang  1 , Kai-Ge Gao  3 , Jing Xie  1 , Jun Tao  1 , Zi-Shuo Yao  1
Affiliations

High-performance Pyroelectric Property Accompanied by Spin Crossover in a Single Crystal of Fe(II) Complex

Chengdong Liu et al. Angew Chem Int Ed Engl. .

Abstract

Pyroelectric materials hold significant potential for energy harvesting, sensing, and imaging applications. However, achieving high-performance pyroelectricity across a wide temperature range near room temperature remains a significant challenge. Herein, we demonstrate a single crystal of Fe(II) spin-crossover compound shows remarkable pyroelectric properties accompanied by a thermally controlled spin transition. In this material, the uniaxial alignment of polar molecules results in a polarization of the lattice. As the molecular geometry is modulated during a gradual spin transition, the polar axis experiences a colossal thermal expansion with a coefficient of 796×10-6 K-1. Consequently, the material's polarization undergoes significant modulation as a secondary pyroelectric effect. The considerable shift in polarization (pyroelectric coefficient, p=3.7-22 nC K-1cm-2), coupled with a low dielectric constant (ϵ'=4.4-5.4) over a remarkably wide temperature range of 298 to 400 K, suggests this material is a high-performance pyroelectric. The demonstration of pyroelectricity combined with magnetic switching in this study will inspire further investigations in the field of molecular electronics and magnetism.

Keywords: Fe(II); dielectric; pyroelectric; spin crossover; thermal expansion.

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References

    1. P. Lheritier, A. Torelló, T. Usui, Y. Nouchokgwe, A. Aravindhan, J. Li, U. Prah, V. Kovacova, O. Bouton, S. Hirose, E. Defay, Nature 2022, 609, 718–721.
    1. J. Jiang, L. Zhang, C. Ming, H. Zhou, P. Bose, Y. Guo, Y. Hu, B. Wang, Z. Chen, R. Jia, S. Pendse, Y. Xiang, Y. Xia, Z. Lu, X. Wen, Y. Cai, C. Sun, G.-C. Wang, T.-M. Lu, D. Gall, Y.-Y. Sun, N. Koratkar, E. Fohtung, Y. Shi, J. Shi, Nature 2022, 607, 480–485.
    1. S. B. Lang, Phys. Today 2005, 58, 31–36.
    1. Y. Zhou, T. Ding, J. Guo, G. Xu, M. Cheng, C. Zhang, X.-Q. Wang, W. Lu, W. L. Ong, J. Li, J. He, C.-W. Qiu, G. W. Ho, Nat. Commun. 2023, 14, 426.
    1. W. Guo, H. Xu, W. Weng, L. Tang, Y. Ma, Y. Liu, L. Hua, B. Wang, J. Luo, Z. Sun, Angew. Chem. Int. Ed. 2022, 61, e202213477.

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