Phase transition and structure of (C3N2H5)2SbF5 single crystal |
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| Affiliation: | 1. Department of Physics, Opole University of Technology, Ozimska 75, 45-271 Opole, Poland;2. Institute of Experimental Physics, University of Wrocław, M. Borna 9, 50-204 Wrocław, Poland;3. Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland;1. K. D. Ushinsky Yaroslavl State Pedagogical University, 150000 Yaroslavl, Russian Federation;2. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation;3. Yaroslavl State Technical University, 150023 Yaroslavl, Russian Federation;1. Universidad Nacional de Colombia – Bogotá, Dpto. de Física, Grupo de Materiales Nanoestructurados y sus Aplicaciones, Cra. 30 No. 45-03 Edificio 404 Lab. 121C Ciudad Universitaria, Bogotá, Colombia;2. Grupo NanoTech, Facultad de Ciencias Naturales y Matemáticas, Universidad del Rosario, Cra. 24 No. 63C-69, Bogotá, Colombia;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. School of Renewable Energy, North China Electric Power University, Beijing 102206, China |
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| Abstract: | New crystal of the formula (C3N2H5)2SbF5 was obtained and characterized with DSC, DTA, TGA, structural and dielectric studies. DSC and dielectric studies revealed a structural phase transition of the first order at 216 K on cooling and 220 K on heating. The entropy of the transition ΔS equal to 11.5 J/mol·K gives evidence that the phase transition is order-disorder type. X-ray studies showed that transition undergoes from orthorhombic phase I with a space group of Pmmn to monoclinic phase II with a space group P21/m. The phase transition is proposed to be ferroelastic type. The molecular mechanism of the phase transition is related to ordering of imidazolium cations in phase II that are disordered in phase I. |
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| Keywords: | Phase transition Crystal structure Electric permittivity |
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