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Static disorder in a perovskite mixed-valence metal–organic framework

Collings, Ines E., Saines, Paul J., Mikolasek, Mirko, Boffa Ballaran, Tiziana, Hanfland, Michael (2020) Static disorder in a perovskite mixed-valence metal–organic framework. CrystEngComm, . ISSN 1466-8033. (doi:10.1039/D0CE00119H) (KAR id:80987)

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https://doi.org/10.1039/D0CE00119H

Abstract

ariable-temperature and variable-pressure single-crystal diffraction studies are carried out on a mixed-valence perovskite dimethylammonium (DMA) iron formate compound, with the formula [(DMA3)(H2O)][FeII3FeIII(HCOO)12], in order to investigate potential electric ordering of the DMA cation from its fourfold type of dynamic disorder at ambient conditions. Mössbauer spectroscopy is additionally carried out at ambient conditions to confirm the presence and ratio of Fe2+ and Fe3+ cations. Below 200 K, a dynamic to static disorder of the DMA cation is observed, while the crystal symmetry and iron formate framework structure remain the same. Upon application of pressure, however, a phase transition occurs that lowers the symmetry above 3.3 GPa. This work highlights the further chemical modifications that are possible within the dimethylammonium metal formates family, i.e. doping upon the A-site with neutral molecules, leading to additional opportunities to tune their physical properties.

Item Type: Article
DOI/Identification number: 10.1039/D0CE00119H
Uncontrolled keywords: Materials for Energy and Electronics
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Paul Saines
Date Deposited: 24 Apr 2020 13:39 UTC
Last Modified: 24 Mar 2021 00:00 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/80987 (The current URI for this page, for reference purposes)
Saines, Paul J.: https://orcid.org/0000-0002-4207-2112
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