Electrical conductivity and vibrational studies induced phase transitions in [(C₂H₅)₄N]FeCl₄

Abstract

Complex impedance spectra of [(C2H5)4N]FeCl4 at different temperature.

Organic–inorganic interactions revealed by Raman spectroscopy during reversible phase transitions in semiconducting [(C2H5)4N]FeCl4

“…22 For the quaternary amine cations [(C n H 2n+1 ) 4 N] + bound to an iron(III) chloride, the increase in the number of carbon atoms in the alkyl chain makes it possible to decline the structural stability of the anion (FeCl 4 ). 23 The transition temperatures are dependent on the thermal history of the samples 24 and contrary results are reported in literature 23,[25][26][27] for the [(C 2 H 5 ) 4 N]FeCl 4 (n ¼ 2) compound. Indeed, the Differential Thermal Analysis (DTA) measurements performed by D. Wyrzykowski et al…”

Ferroelectric and electrical properties of LiNaWO4 compound

“…It is found that the spectrum exhibits two different regions: (1) a low frequency plateau region (conductivity is almost independent of frequency and equal to dc conductivity) and (2) a high frequency conductivity dispersion region (increasing frequency conductivity increases due to mobility of charge carriers). This behavior follows Jonscher's power law, which is related to the dynamics of ionic hopping transport between localized sites and given by the following expression: where σ dc is the frequency independent conductivity, s the frequency exponent, displaying information about the degree of interaction pertaining to the charge carriers with its environment and generally having a value in the range of 0 ≤ s ≤ 1 . However, some studies showed that 1 is not a limited value for S. In fact, for s < 1, it indicates that the hopping of the charge carriers is in a translational motion and, for s > 1, the motion is a localized one .…”

“…It is found that the spectrum exhibits two different regions: (1) a low frequency plateau region (conductivity is almost independent of frequency and equal to dc conductivity) and (2) a high frequency conductivity dispersion region (increasing frequency conductivity increases due to mobility of charge carriers). This behavior follows Jonscher's power law, [32,33] which is related to the dynamics of ionic hopping transport between localized sites and given by the following expression:…”

“…where σ dc is the frequency independent conductivity, s the frequency exponent, displaying information about the degree of interaction pertaining to the charge carriers with its environment and generally having a value in the range of 0 ≤ s ≤ 1. [33] However, some studies [34] showed that 1 is not a limited value for S. In fact, for s < 1, it indicates that the hopping of the charge carriers is in a translational motion and, for s > 1, the motion is a localized one. [35] A is the preexponential factor, which informs about the strength of the polarizability having the unit of conductivity.…”

Crystal structure, Hirshfeld surface analysis, Thermal study and Conduction mechanism of [(C4H9)4P]3Bi2Cl9 compound

“…For large values of W M /K B T, Equation becomes: Figure shows the variation of (1‐S) as a function of temperature. The linear fit of the curve in region I, and II was used to determine the value of W M , which equals 0.24 and 0.43 eV, respectively.…”