International Journal of Advanced Science and Research

International Journal of Advanced Science and Research


International Journal of Advanced Science and Research
International Journal of Advanced Science and Research
Vol. 3, Issue 2 (2018)

Thermal, FTIR and EPR studies of transition metal ions doped with tellurite magnesium borate glass at room temperature


R Palani, V Gobala Vijayan

Glasses with composition 15TeO2-10MgO-(75-x) B2O3 -xNiO and 15TeO2-10MgO-(75-x) B2O3 - xWO3 (where x = 0 to 1.0 in steps of 0.2 mol %) have been prepared with a conventional melt–quenching method. The glass samples were characterized by using X-ray diffraction (XRD), Thermo Gravimetric - Differential Thermal Analysis (TG - DTA), Fourier Transform Infrared Spectroscopy (FTIR), and Electron Paramagnetic Resonance (EPR). XRD scans evidenced the amorphous state of as-quenched samples. To recognize the thermal behavior of the glasses, glass transition (Tg), crystallization peak (Tp), melting temperature (Tm) and the glass stability against crystallization (∆T) were calculated from the thermal analyses. FTIR spectrometry in the spectral range 400 – 4000 cm-1 at room temperature was interpreted in terms of the structural transformations on the glass network, according to the changing B2O3, NiO and WO3 content. The EPR spectra have been traced in X-band (ʋ ≈ 9.78GHz) at room temperature. The resonance signals at g ≈ 2.0 - 2.3 were found for the metal ions Ni2+ and W6+ respectively. Electron paramagnetic resonance data suggest the bonding between transition metal ions and ligands as an ionic in nature.
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