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Suresh Sripada,D. Esther Kalpana Rani,G. Upender,P. Gayathri Pavani 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.5
Titanium boro tellurite glasses in the xB<sub>2</sub>O<sub>3</sub>−(90−x) TeO<sub>2</sub> + 10TiO<sub>2</sub> (where x = 0 to 50 mol%) system were prepared by using the conventional melt-quenching technique. Glass transition temperatures were measured with differential scanning calorimetry (DSC) and found to be in the range of 300 - 370 ℃. The Raman spectra showed a cleavage of the continuous TeO<sub>4</sub> (tbp) network by breaking of the Te-O-Te linkages. The relative transition of TeO<sub>4</sub> − groups to TeO<sub>3</sub> − groups is accompanied by a change in the oxygen coordination of the boron from 3 to 4 (BO<sub>3</sub> <sup>−</sup> to BO<sub>4</sub> <sup>−</sup>). The impedance plots Z▼(┺) versus Z▽(┺) for all the glass samples were recorded and found to exhibit a single circle. The AC conductivity of all glass samples was studied in the frequency range from 100 Hz to 1 MHz and in the temperature range from room temperature (RT) to 375 ℃. The AC conductivity decreased by about one order in magnitude with increasing B<sub>2</sub>O<sub>3</sub> content. The conductivity was found to be on the order of 10<sup>−4.5</sup> to 10<sup>−6</sup> (┯-cm)<sup>−1</sup> at 375 → and 1 MHz for 10 mol% and 50 mol% B<sup>2</sup>O<sup>3</sup> contents, respectively. The relaxation behavior in these glass samples is discussed based on the complex modulus and impedance data.