Open AccessElectrical conductivity and vibrational studies induced phase transition in [N(C3H7)4]2ZnBr4 compound
Author(s) -
Souad Chkoundali,
Abdelhedi Aydi
Publication year - 2021
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x21500053
Subject(s) - monoclinic crystal system , raman spectroscopy , materials science , rietveld refinement , electrical resistivity and conductivity , phase transition , crystallography , powder diffraction , phase (matter) , debye , polaron , condensed matter physics , conductivity , grain boundary , analytical chemistry (journal) , physics , electron , chemistry , crystal structure , microstructure , optics , quantum mechanics , chromatography
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 [Formula: see text]. A temperature study of Raman scattering revealed two phase transitions at approximately [Formula: see text] = 340 K and [Formula: see text] = 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(C 3 [Formula: see text]][Formula: see text]. 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(C 3 [Formula: see text]] 2 ZnBr 4 obeyed Jonscher’s law: [Formula: see text] = [Formula: see text] 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).