• R V Anavekar

      Articles written in Bulletin of Materials Science

    • DC electrical conductivity of Na2O-ZnO-B2O3 glass system

      R V Anavekar N Devaraj J Ramakrishna

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      The d.c. electrical conductivity of Na2O-ZnO-B2O3 glass system has been measured as a function of temperature in the range of 350–600°K. The conductivity data show that the activation energy of Na+ ions is dependent on ZnO concentration. The results have been discussed in the light of the cluster model of glasses.

    • Characterization and optical properties of Pr$_2$O$_3$-doped molybdenum lead-borate glasses

      SANGEETA B KOLAVEKAR N H AYACHIT R V ANAVEKAR

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      Pr$^{3+}$ doped molybdenum lead-borate glasses with the chemical composition 75PbO−[25–($x+y$)B$_2$O$_3$]–$y$MoO$_3$–$x$Pr$_2$O$_3$ (where $x = 0.5$ and 1.0 mol% and y = 0 and 5 mol%) were prepared by conventional melt-quenching technique. Thermal, optical and structural analyses are carried out using DSC, UV and FTIR spectra. The physical parameters,like glass transition ($T_g$), stability factor ($\Delta T$), optical energy band gap ($E_{gopt}$), of these glasses have been determined as a function of dopant concentration. The $T_g$ and optical energy gaps of these glasses were found to be in the range of 290–350$^{\circ}$C and 2.45–2.7 eV, respectively. Stability of the glass doped with Pr$^{3+}$ is found to be moderate ($\sim$40). The results are discussed using the structural model of Mo–lead-borate glass

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