• V S Deogaonkar

      Articles written in Bulletin of Materials Science

    • Thermally stimulated discharge current (TSDC) and dielectric constant of semiconducting glasses

      D K Burghate V S Deogaonkar S B Sawarkar S P Yawale S V Pakade

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      In this paper the results of thermally stimulated discharge current (TSDC) and dielectric constant for 40PbO–60Bi2O3 glass thermoelectrets are presented. Measurements of TSDC and dielectric constant, $\varepsilon'$, have been carried out in the temperature range 30–300°C. The thermoelectrets were prepared at different polarizing fields. The various observed peaks in the thermograms are discussed on the basis of space charge polarization. The trap energy is evaluated from the Garlick–Gibson plot of initial rise method. Similarly other parameters such as relaxation time, charge release etc are evaluated.

    • Optical properties of lead–bismuth cuprous glasses

      P T Deshmukh D K Burghate V S Deogaonkar S P Yawale S V Pakade

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      The optical transmission and absorption spectra in UV–VIS were recorded in the wavelength range 350–800 nm for different glass compositions in the system (CuO)𝑥(PbO)50–𝑥(Bi2O3)50 (𝑥 = 2.5, 5.0, 7.5, 10.0, 12.5, 15.0, 20.0). Absorption coefficient (𝛼), optical energy gap (𝐸opt), refractive index (𝑛D), optical dielectric constant ($\varepsilon_{\infty}^{′}$), measure of extent of band tailing (𝛥 𝐸), constant (𝛽) and ratio of carrier concentration to the effective mass (𝑁/𝑚*) have been reported. The effects of compositions of glasses on these parameters have been discussed. It has been indicated that a small compositional modification of the glasses lead to an important change in all the optical properties including non-linear behaviour. The optical parameters were found to be almost the same for different glasses in the same family.

    • Electrical conductivity of polyaniline doped PVC–PMMA polymer blends

      S H Deshmukh D K Burghate V P Akhare V S Deogaonkar P T Deshmukh M S Deshmukh

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      The electrical conductivity of polyaniline doped polyvinylchloride (PVC) and poly(methyl methacrylate) (PMMA) thin films has been measured by studying the 𝐼–𝑉 characteristics at various temperatures in the range 323–363 K. The results are presented in the form of 𝐼–𝑉 characteristics and analysis has been made by interpretation of Poole–Frenkel, Fowler–Nordheim, Schottky ln(𝐽) vs 𝑇 plots, Richardson and Arrhenius plots. The analysis of these results suggests that Schottky and Richardson mechanisms are primarily responsible for the observed conduction.

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      Posted on October 12, 2020

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      Chemical Sciences 2020

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