• M. Sreepad
• K. Chandra Sekhar
• Md. Shareefuddin
• G. Pushpa Chakrapani

In the present work, the authors prepared the glasses with the chemicals, BaO, ZnO, CuO and Na2B4O7 in which CuO is used as probe for getting EPR signal and to evaluate the ligand field environment around the Cu2+ ion. The sample were prepared with the compositional formula x BaO – 10 ZnO – 1 CuO - (89-x) Na2B4O7 in which x = 0, 10, 20m 30 & 40mol% using melt quenching method. The samples initially exposed to XRD spectra in the range 10 to 80degrees. The XRD spectra revealed no sharp peaks in the spectra that confirms the non-crystalline nature of the glass samples. The polished samples were next subjected to UV- Visible spectra in the wavelength range 200nm to 1200nm. All the absorption spectra shown similar kind and one broad absorption band is noticed for all the spectra of the samples. The absorption band is assigned to 2B1g to 2B2g transition. The calculated band gap values were clearly reduced from 3.457 eV to 2.679 eV. The decrease in the band gap values were ascribed to the enhancing the non bridging oxygen in the structure of the glasses. Urbach energy values were evaluated from Urbach plot and the evaluated values are smaller and hence the samples have less defects in the structure. Studies using electron paramagnetic resonance (EPR) are essential for comprehending the local composition and characteristics of glasses, especially when examining the context of coordination and oxidation state of paramagnetic ions (such as transition metals) doped within the glass matrix. By doing so, researchers examine the glass network at the atomic level and detect changes in the local environment based on the features of the EPR signals

Tetra borate glasses, optical band gap, Spin-Hamiltonian

"OPTICAL AND EPR STUDIES ON BARIUM ZINC SODIUM TETRABORATE GLASSES MODIFIED WITH CU2+ IONS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 10, page no.d159-d163, October-2025, Available :http://www.jetir.org/papers/JETIR2510322.pdf

"OPTICAL AND EPR STUDIES ON BARIUM ZINC SODIUM TETRABORATE GLASSES MODIFIED WITH CU2+ IONS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 10, page no. ppd159-d163, October-2025, Available at : http://www.jetir.org/papers/JETIR2510322.pdf