Non-linear impedance of V2O5 nanorods obtained at 923K

Description

The DataSet contains the non-linear electrical properties of V2O5 nanorods which were measured by the impedance spectroscopy method. V2O5 nanorods were obtained by the sol-gel method. The information about xerogel powder synthesis is described in the Journal of Nanomaterials. The precursor powder was pressed into the disk-shaped pellets (12mm in diameter and 1mm in thickness) under a compacting pressure of 25 kN/cm2. The V2O5 nanorods are achieved by annealing the pellet at 923K for 10 h with a heating rate of 0.1 K/min and a cooling rate of 0.5K/min.

For the electrical measurements, gold electrodes were evaporated at the preheated and ground sample. Impedance measurements were carried out in the temperature range from 153 K to 423 K, with the ac voltage of 0.01 Vrms with Concept 40 broadband dielectric spectrometer. The higher harmonic components (harmonic 0, harmonic 1, and harmonic 2) were measured up to a frequency of 1000 Hz. Here the impedance for harmonic components was defined as the ratio of the voltage base wave to the n-th harmonic current component: Zn∗= U0∗/In∗, where Zn⁎ including the base wave generally depends on the sample voltage U1⁎ base wave amplitude. From Zn⁎ all other independent variables are calculated. The dependence of current density on the cosinusoidal electric field E(t)= E0cos(ωt) leads to the following expression:

j´ = σ´0hE0 cos (ωt) + σ´1hE0 cos (2ωt) + σ´2hE0 cos (3ωt) + …
Where σ´0h denotes base conductivity, while σ´1h, σ´2h etc. are higher harmonics conductivity. The admittivity for harmonic components with n ≥1, is calculated from relation σ⁎n = i2πfε0ε⁎n

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NLNT.zip

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Details

Year of publication:

2021

Verification date:

2021-07-13

Dataset language:

English

Fields of science:

materials engineering (Engineering and Technology)

DOI:

10.34808/vaps-3b98

Series:

Vanadium oxides

Verified by:

Gdańsk University of Technology

Keywords

References

publication The influence of thermal conditions on V2O5 nanostructures prepared by sol-gel method

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