Electrical conductivity and vibrational studies induced phase transitions in [(C2H5)4N]FeCl4
| Autor: | M. Ben Gzaiel, Mohamed Gargouri, Abderrazek Oueslati, Kh. Ben Brahim |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Phase transition
Materials science General Chemical Engineering Analytical chemistry 02 engineering and technology General Chemistry Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Thermal conduction 01 natural sciences 0104 chemical sciences symbols.namesake Electrical resistivity and conductivity symbols Grain boundary 0210 nano-technology Thermal analysis Raman spectroscopy Powder diffraction |
| Zdroj: | RSC Advances. 8:40676-40686 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c8ra07671e |
| Popis: | The compound, tetraethylammonium tetrachloroferrate [(C2H5)4N]FeCl4, was prepared by slow evaporation at room temperature. It was characterized by X-ray powder diffraction, thermal analysis, and impedance and vibrational spectroscopy. X-ray diffraction data confirmed formation of a single phase material which crystallized at room temperature in the hexagonal system (P63mc space group). DSC showed the existence of two phase transitions at 413 K and 430 K. Electrical conductivity was measured in the temperature and frequency ranges of 390 K to 440 K and 40 Hz to 110 MHz, respectively. Nyquist plots revealed the existence of grains and grain boundaries that were fitted to an equivalent circuit. AC conductivity plots were analyzed by Jonscher's power law. Variations in the “s” values indicated that CBH models describe the conduction mechanism in regions I and II. Temperature dependence of Raman spectra showed that the most important changes were observed in the cationic parts ([(C2H5)4N]+). The activation energy value obtained from the line width decreased which indicated an order–disorder model. |
| Databáze: | OpenAIRE |
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