Electrical conductivity and vibrational studies induced phase transition in [N(C3H7)4]2ZnBr4 compound
Bis-Tetrapropylammonium tetrabromozincate was synthesized and characterized by X-ray powder diffraction, as well as vibrational and impedance spectroscopy. Rietveld’s refinement of X-ray diffractogram confirmed the crystallization of the compound through the monoclinic system (space group C2/c). A t...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
World Scientific Publishing
2021-02-01
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| Series: | Journal of Advanced Dielectrics |
| Subjects: | |
| Online Access: | http://www.worldscientific.com/doi/epdf/10.1142/S2010135X21500053 |
| Summary: | Bis-Tetrapropylammonium tetrabromozincate was synthesized and characterized by X-ray powder diffraction, as well as vibrational and impedance spectroscopy. Rietveld’s refinement of X-ray diffractogram confirmed the crystallization of the compound through the monoclinic system (space group C2/c). A temperature study of Raman scattering revealed two phase transitions at approximately T1 = 340 K and T2 = 393 K. The wavenumber and the line width’s evolution as a function of temperature showed some peculiarities associated with these transitions, which suggests that they are governed by the reorientation of the organic part [N(C3H7)4]+. The complex impedance plotted as a double semicircular arc in the studied temperature range and the centers of these semicircles lie below the real axis, which indicates that the material is an on-Debye type. These semicircular arcs are related to the bulk and the grain boundary effects. Furthermore, the alternating current conductivity of [N(C3H7)4]2ZnBr4 obeyed Jonscher’s law: σAC(ω) = σdc + Aωs and the conduction could be attributed to the correlated barrier hopping (CBH) model in both region(I) and (II) and the Non-overlapping Small Polaron Tunneling (NSPT) in region (III). |
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| ISSN: | 2010-135X 2010-1368 |