DSC, Raman and impedance spectroscopy studies on the xB2O3 − (90 − x)TeO2 − 10TiO2 (where x = 0 to 50 mol%) glass system

• Published in: Journal of the Korean Physical Society 2013, 62(5), , pp.762-769
• Main Authors: Sripada, Suresh, Rani, D. Esther Kalpana, Upender, G., Pavani, P. Gayathri
• Format: Article
• Language: English
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.62.762

Titanium boro tellurite glasses in the x B 2 O 3 − (90− x ) TeO 2 − 10TiO 2 (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 °C. The Raman spectra showed a cleavage of the continuous TeO 4 (tbp) network by breaking of the Te-O-Te linkages. The relative transition of TeO 4 − groups to TeO 3 − groups is accompanied by a change in the oxygen coordination of the boron from 3 to 4 (BO 3 − to BO 4 − ). The impedance plots Z ″( ω ) versus Z ′( ω ) 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 °C. The AC conductivity decreased by about one order in magnitude with increasing B 2 O 3 content. The conductivity was found to be on the order of 10 −4.5 to 10 −6 (Ωcm) −1 at 375 °C and 1 MHz for 10 mol% and 50 mol% B 2 O 3 contents, respectively. The relaxation behavior in these glass samples is discussed based on the complex modulus and impedance data.