• S P Yawale

Articles written in Bulletin of Materials Science

• Infrared spectra of zinc doped lead borate glasses

The infrared spectra of zinc-doped lead borate glasses (10–30 mol% ZnO) were measured over a continuous spectral range (400–4000 cm–1) in an attempt to study their structure systematically. No boroxol ring formation was observed in the structure of these glasses. The formation of Zn in tetrahedral coordination was not observed. The conversion of three-fold to four-fold coordinated boron took place.

• Microwave properties of vanadium borate glasses

A.c. conductivity, dielectric constant and loss, and variation with temperature (302–373 K) for four different compositions of V2O5–B2O3 glasses were reported at 9.586 GHz microwave frequency. The quality factor (𝑄) and attenuation factor (𝛼) being the important parameters in the microwave range of applications were also studied. The change in the dielectric constant and loss was observed with composition of V2O5. The maximum loss was found to be at 15V2O5 mol%. The peak was observed in loss with temperature.

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

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

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.

• Conductivity study of PEO–LiClO4 polymer electrolyte doped with ZnO nanocomposite ceramic filler

The preparation and characterization of composite polymer electrolytes comprising PEO and LiClO4 with different concentrations of ZnO nanoparticles are studied. Conductivity measurements were carried out and discussed. In order to ascertain the thermal stability of the polymer electrolyte with maximum conductivity, films were subjected to TG/DTA analysis in the range of 298–823 K. In the present work, FTIR spectroscopy is used to study polymer structure and interactions between PEO and LiClO4, which can make changes in the vibrational modes of the atoms or molecules in the material. FTIR spectra show the complexation of LiClO4 with PEO. The SEM photographs indicated that electrolytes are miscible and homogeneous.

• # Bulletin of Materials Science

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Volume 42 | Issue 6
December 2019

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