Infrared studies of phase transitions in ferroelectric (C5H5NH)5Bi2Br11 |
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| Affiliation: | 1. Faculty of Chemistry, University of Wrocław, F. Joliot Curie 14, 50-383 Wrocław, Poland;2. Institute of Low Temperature and Structure Research of the Polish Academy of Science, Okólna 2, 50-422 Wrocław, Poland;1. Faculty of Foundry Engineering, AGH University of Science and Technology, 30-059 Krakow, Poland;2. Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, 30-059 Krakow, Poland;3. Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Republic of Korea;1. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, PR China;2. Division of Solar Energy Materials and Engineering, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, PR China;1. NEEM – Núcleo de Espectroscopia e Estrutura Molecular, Chemistry Department, Federal University of Juiz de Fora, 36036-330, Juiz de Fora, MG, Brazil;2. NEQC – Núcleo de Estudos em Química Computacional, Chemistry Department, Federal University of Juiz de Fora, 36036-330, Juiz de Fora, MG, Brazil;3. GPQMAP – Grupo de Pesquisa em Química de Materiais Porosos, Chemistry Department, Federal University of Juiz de Fora, 36036-330, Juiz de Fora, MG, Brazil;1. Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, Via Vetoio 2, 67100, Coppito, L’Aquila, Italy;2. Sorbonne Universities, UPMC, Laboratoire de Réactivité de Surface UMR CNRS 7197, Tour 43-53, 3rd floor, 4 Pl. Jussieu, 75005, Paris, France;3. Service de Bioénergétique, Biologie Structurale et Mécanismes (SB2SM) CEA, iBiTec-S, Biochimie Biophysique et Biologie Structurale (B3S), I2BC, UMR 9198, F-91191 Gif-sur-Yvette, France |
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| Abstract: | Infrared spectra (3500–500 cm−1) of polycrystalline (C5H5NH)5Bi2Br11 samples were investigated within the temperature range 27–456 K. The assignments of the observed bands in the spectra measured at 27, 310 and 456 K are proposed. A temperature dependence of the wavenumbers and full width at half maximum (FWHM) of the bands arising from some internal vibrations of pyridinium cations are analysed in order to explain the role of cations in the mechanism of the phase transition at 118 (paraelectric–ferroelectric) and 403 K. It was found that numerous bands arising from the internal modes of the cations exhibit the splitting in the vicinity of both phase transitions, that indicates a distinct changes in the motional state of the pyridinium moieties. |
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