Dielectric relaxation and AC conductivity studies of Se₉₀Cd_10−xIn_xglassy alloys

Abstract

Chalcogenide glassy alloys of Se 90 Cd 10−x In x (x = 2, 4, 6, 8) are synthesized by melt quench technique. The prepared glassy alloys have been characterized by techniques such as differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and energy dispersive X-ray (EDAX). Dielectric properties of Se 90 Cd 10−x In x (x = 2, 4, 6, 8) chalcogenide glassy system have been studied using impedance spectroscopic technique in the frequency range 42 Hz to 5 MHz at room temperature. It is found that the dielectric constants ε , dielectric loss factor ε and loss angle Tan ı depend on frequency. ε , ε and loss angle Tan ı are found to be decreasing with the In content in Se 90 Cd 10−x In x glassy system. AC conductivity of the prepared sample has also been studied. It is found that AC conductivity increases with frequency where as it has decreasing trend with increasing In content in Se-Cd matrix. The semicircles observed in the Cole-Cole plots indicate a single relaxation process.

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti2CTx MXene reinforced polyvinyl alcohol nanocomposites

“…The double logarithmic plot of σ ac versus frequency for the pure PVA and nanocomposite films with varying filler loadings increased gradually with increasing frequency (Figure 17). This increase in AC conductivity with increasing frequency is attributed to the enhancement in the conduction mechanism due to the hopping of charge carriers 59 . A further study of these plots revealed the existence of three separate zones.…”

“…This increase in AC conductivity with increasing frequency is attributed to the enhancement in the conduction mechanism due to the hopping of charge carriers. 59 A further study of these plots revealed the existence of three separate zones. The less value of electrical conductivity in low-frequency dispersion region attributes to the space-charge polarization.…”

Dielectric relaxation in glassy Se 90 Cd 6 In 4

“…Contribution of ion jumps, conduction loss of ion migration and ion polarisation losses are accountable for ɛ ″. Probably ion vibration is the only source of dielectric loss at high frequencies, therefore ε ″ is minimum at high frequencies [7].…”

Effect of Sodium Iodide Dopant Concentration on the Electrical Behavior of AgPO3 Glassy Networks

“…The dielectric study of a material helps to define and understand two basic electrical characteristics of the material, Namely, the capacitive insulating behavior and the conduction nature behavior. The first behavior represents the ability to store electrical charges, while the second represents the ability to transfer electrical charge [23].…”

“…Therefore, studying the electric and dielectric properties of deliberately doped materials as a function of frequency and temperature is crucial in understanding the conduction mechanism. The conduction mechanism of such glassy systems was found to vary with varying the dopant ion type and its concentration [16][17][18][19][20][21][22][23]. In this regard, impedance spectroscopy is a powerful technique for measuring many of the electrical properties of material and their interface with electronically conducting electrodes.…”