Investigations of Microstructure and Dc Conductivity of V₂O₅‐Nd₂O₃ Glass Nanocomposites

Abstract

The present work points to highlight the structural, optical and electrical properties of some semiconducting V2O5‐Nd2O3 glass nanocomposites. Structural properties such as identification of nano phases in the glassy matrix and crystallite sizes have been evaluated using X‐ray diffraction (XRD) and transmission electron microscopy (TEM). Fourier transform infrared spectroscopy (FT‐IR) and Raman spectroscopy have been used to find out nature of bonding in the as‐synthesized glass nanocomposites. Optical properties have been analyzed using Ultraviolet‐visible (UV‐Vis) absorption spectroscopy and we have studied Dc electrical conductivity at various temperatures. The crystallite sizes of V2O5 and NdVO4 embedded in the present glassy systems are found to increase with V2O5 content. Stretching vibration of νs (VO4), Nd–O bond, V–O bond, orthorhombic phase of V2O5 are present in the present system. The small‐polaron hopping theory could adequately explain the temperature dependence of the electrical Dc conductivity. It is observed that the fundamental absorption edge and cutoff wavelength shift towards red with the increase of V2O5 content. The fundamental UV‐Vis absorption spectra have been analyzed, which indicates indirect band transitions. It is also observed that optical band gap energy decreases with increase in concentration of V2O5 due to structural changes.

Influence of Fe on Crystallization Behaviour and Electrical Conductivity of V2O5 ⋅ MoO3 ⋅ CdO ⋅ ZnO Glass Nanocomposite

“…We have observed that DC activation energy (E σ ), and activation energy (E H ) for hopping frequency (ω H ) increases with increasing Fe content in glass system based on xFe ⋅ (1‐x) (0.3 V 2 O 5 ⋅ 0.2MoO 3 ⋅ 0.4CdO ⋅ 0.1ZnO) [x=0.0, 0.05, 0.10] compare with other glassy systems [12,23–24,53–54,56] (Table 1).…”

“…In the current work, the investigation of the DC electrical conductivity of amorphous semiconductors may take into account the density of defect states in the mobility gap [52–54] . Figure 6 depicts the temperature‐dependent DC electrical conductivity of the current system, demonstrating its thermally activated nature [12,23–24,53–54,56] .…”

“…[52][53][54] Figure 6 depicts the temperature-dependent DC electrical conductivity of the current system, demonstrating its thermally activated nature. [12,[23][24][53][54]56] It is also shown in Figure 6 that the current system agrees well with the DC conductivity ranges of a vanadium-doped nanostructured sample doped. [12,57] As can be observed in Figure 6, DC conductivity rises as temperature rises, indicating that the current system is of semiconducting type.…”

“…In the current work, the investigation of the DC electrical conductivity of amorphous semiconductors may take into account the density of defect states in the mobility gap. [52][53][54] Figure 6 depicts the temperature-dependent DC electrical conductivity of the current system, demonstrating its thermally activated nature. [12,[23][24][53][54]56] It is also shown in Figure 6 that the current system agrees well with the DC conductivity ranges of a vanadium-doped nanostructured sample doped.…”

“…[12,57] As can be observed in Figure 6, DC conductivity rises as temperature rises, indicating that the current system is of semiconducting type. [12,[23][24][53][54]56] As the Fe content is doped gradually with the host glassy system, DC conductivity increases. [24] The experimental data in Figure 6 can be analyzed using the Arrhenius type relation (4).…”