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Issue 47, 2018, Issue in Progress
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Widely used hardly known. An insight into electric and dynamic properties of formamidinium iodide

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Abstract

The simple organic crystal formamidinium iodide (FAI) appeared to be a novel semiconducting material in a wide temperature range. The electric properties of FAI and the role of formamidinium cation (FA+) in the molecular mechanism of the solid-to-solid phase transitions (at 345 K (III → II) and 388 K (II → I)) were analysed. The creation of the ferroelastic domain structure in phases III and II was proved on the basis of observation under a polarizing microscope. Moreover, the molecular arrangement of dipolar organic FA+ was studied by 1H NMR (spin-lattice relaxation time) and vibrational spectroscopy supported by density functional theory. The theoretical results show a good agreement with the experimental data. The infrared spectrum in a harmonic approximation was calculated and a comparative vibrational analysis was performed. All used techniques showed that the prototypic phase I exhibits the feature of plastic phase.

Graphical abstract: Widely used hardly known. An insight into electric and dynamic properties of formamidinium iodide

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Publication details

The article was received on 06 May 2018, accepted on 21 Jun 2018 and first published on 24 Jul 2018


Article type: Paper
DOI: 10.1039/C8RA03871F
Citation: RSC Adv., 2018,8, 26506-26516
  • Open access: Creative Commons BY-NC license
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    Widely used hardly known. An insight into electric and dynamic properties of formamidinium iodide

    K. Mencel, P. Durlak, M. Rok, R. Jakubas, J. Baran, W. Medycki, A. Ciżman and A. Piecha-Bisiorek, RSC Adv., 2018, 8, 26506
    DOI: 10.1039/C8RA03871F

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