Enhancement of ionic conductivity in the composite solid electrolyte system: TlI–Al2O3

Abstract

This paper reports the heterogeneously doped alumina (Al 2 O 3 ) on the ionic conductivity of thallium iodide. Composite materials of formula (1−x) TlI-xAl 2 O 3 , x = 0-0.7 have been prepared and studied by X-ray diffraction, differential scanning calorimetry, and electrical conductivity. X-ray diffraction and differential scanning calorimetry proved the formation of composite in this binary system. The maximum enhancement observed is about three orders of magnitude with respect to the host material. The enhancement of electrical conductivity in comparison with pure thallium iodide can be interpreted with the space charge layer model. Moreover, the increased content of alumina in the system leads to the disappearance of phase transition β-α thallium iodide, which is usually observed in the pure compound. This behavior was explained by stabilizing effect of β-phase at high temperatures and suppression of α-phase at higher contents of alumina.

Synthesis and characterization of copper ferrite nanoparticles doped polyaniline

“…The activation energy values show an opposite trend i.e. as the electrical conductivity increases, the activation energy decreases [26,27]. Hence, CuFe 2 O 4 has the maximum activation energy (3.220 eV) while PANI has the lowest (1.761 eV).…”

Synthesis, characterization and electrical properties of CdI2 doped Al2O3 and TiO2 superionic conductors

“…However, the one at higher frequency results from bulk resistance while that at low frequency resulted from grain boundary resistance contribution. It has been found that the idealized impedance plot of such material consists of a semicircle attributed to grain and grain boundary as well as low frequency inclined spike due to the ionic polarization and electrochemical reactions, occurring at the electrode interface [14,24]. The appearance of the spikes is an indication that the conduction in these materials is ionic in nature [16].…”

“…where the resistance of grain (R g ) can directly be obtained from the intercept of the Z -axis [14]. The angular frequency of grain (ω g ) is obtained at the maxima of the semicircles.…”

“…In most cases, the second phase consists of non-conducting materials such as TiO 2 , Al 2 O 3 , which is nearly insoluble in the host material under the fabrication conditions [13,14]. The conductivity enhancement in composites can be explained in terms of the presence of a greater number of surfaces and interfaces, which act as additional sources of point defect [15].…”

Preparation, characterization, electrical and dielectric properties of (1−x) (PbI2–Ag2CrO4)–xTiO2 composite solid electrolytes

“…LiI, AgI, AgCl, CdI 2 , TlI, CsHSO 4 , CsH 2 PO 4 and oxide insulators like SiO 2 , Al 2 O 3 , ZrO 2 , Fe 2 O 3 , MgO, TiO 2 etc. [7][8][9][10][11][12][13][14][15][16][17][18][19]. This method is recognized as an easier and more efficient because of not only the enhanced room temperature ionic conductivity, but also it boosts up the thermal and mechanical stability of the material.…”