2026-06-27T23:02:26Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1165112025-03-18T12:53:43Zcom_20.500.14352_14col_20.500.14352_15

Bermúdez García, Juan Manuel García Fernández, Alberto Andrada Chacón, Adrián Sánchez Benítez, Francisco Javier Ren, Wei Hu, Shunbo Gu, Teng Xiang, Hongjun Biczysko, Malgorzata Castro-García, Socorro Sánchez-Andújar, Manuel Stroppa, Alessandro Señarís-Rodríguez, María Antonia 2025-01-28T09:42:35Z 2025-01-28T09:42:35Z 2019 2052-1553 10.1039/c9qi00749k https://hdl.handle.net/20.500.14352/116511 https://doi.org/10.1039/c9qi00749k 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 syn–anti 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 (LPphase) 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. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 International Pressure-induced reversible framework rearrangement and increased polarization in the polar [NH₄][Cd(HCOO)₃] hybrid perovskite journal article