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Issue 9, 2019
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Pressure-induced reversible framework rearrangement and increased polarization in the polar [NH4][Cd(HCOO)3] hybrid perovskite

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Abstract

In this work, we study the structural changes of the polar [NH4][Cd(HCOO)3] hybrid perovskite under external hydrostatic pressure. We report a reversible framework rearrangement as a function of pressure characterized by: (i) a gradual modification of one formate ligand, which changes its coordination mode from a bridging synanti mode at atmospheric pressure (LP-phase) to a chelating-anti mode at high-pressure (HP-phase) and (ii) a change in the coordination of the Cd2+ cations from six-coordinated (LP-phase) to hepta-coordinated (HP-phase). Very interestingly, this unprecedented framework arrangement displays a large electrical polarization. For instance, the polarization value observed at p = 17.7 GPa is about four times the polarization at atmospheric pressure. Therefore, we report that the external pressure induces a novel framework rearrangement in the polar [NH4][Cd(HCOO)3] hybrid perovskite with enhanced electrical polarization. This structure–property relationship offers new insights for designing novel ferroelectric materials based on pressure-responsive hybrid perovskite materials.

Graphical abstract: Pressure-induced reversible framework rearrangement and increased polarization in the polar [NH4][Cd(HCOO)3] hybrid perovskite

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Supplementary files

Article information


Submitted
20 Jun 2019
Accepted
18 Jul 2019
First published
19 Jul 2019

Inorg. Chem. Front., 2019,6, 2379-2386
Article type
Research Article

Pressure-induced reversible framework rearrangement and increased polarization in the polar [NH4][Cd(HCOO)3] hybrid perovskite

J. M. Bermúdez-García, A. García-Fernández, A. Andrada-Chacón, J. Sánchez-Benítez, W. Ren, S. Hu, T. Gu, H. Xiang, M. Biczysko, S. Castro-García, M. Sánchez-Andújar, A. Stroppa and M. A. Señarís-Rodríguez, Inorg. Chem. Front., 2019, 6, 2379
DOI: 10.1039/C9QI00749K

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