Journal of Applied Physical Science International

Glasses in the 10TeO_2-15BaO-(75-x) B₂O₃-xNiO and 10TeO₂- 15BaO-(75-x) B₂O₃-xWO₃ (where x = 0 to 1.0 in steps of 0.2 mol %) systems were primed by using conventional melt-quenching technique. Glass formation range of the system and thermal, physical and structural features of the quaternary glasses were explored by X-ray Diffraction, Thermo Gravimetric Analysis, Differential Thermal Analysis, Electron Paramagnetic Resonance and Fourier Transform Infrared analysis according to the different molar compositions. The amorphous nature of the samples was established using X-ray diffractometry. Thermal behavior of the glasses were deliberated in terms of the glass transition (T_g), crystallization peak (T_p), melting temperatures (T_m) and the glass stability against crystallization (∆T). The electron paramagnetic resonance spectra have been traced in X-band (ν 9.78 GHz) at room temperature. The EPR study of prepared glass samples show the resonance signals at g 2.0-2.5 and g 1.97 for Ni²⁺ and W⁶⁺ metal ions respectively were found. Electron paramagnetic resonance data suggests the bonding between transition metal ions and ligands as a covalent/ionic in nature. Fourier transform infrared spectra of quaternary glass systems has been precise in the spectral range 400-4000 cm^-1 at room temperature in order to understand the characteristic frequencies of the chemical bonds and bonding mechanisms, which are liable to the structural and spectral changes.