Details

Autor(en) / Beteiligte

• Mencel, K
• Durlak, P
• Rok, M
• Jakubas, R
• Baran, J
• Medycki, W
• Ciżman, A
• Piecha-Bisiorek, A

Titel

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

Ist Teil von

• RSC advances, 2018-01, Vol.8 (47), p.26506-26516

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 H 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.