Spectroscopic investigations of Cu2+ in Li2O�?�Na2O�?�B2O3�?�Bi2O3 glasses

[摘要] Pure and copper doped glasses with composition, 𝑥Li₂Oâ€�??(40â€�?�ð�?��?)Na₂Oâ€�??50B₂O₃â€�??10Bi₂O₃, have been prepared over the range 0 < ð‘�? < 40. The electron paramagnetic resonance (EPR) spectra of Cu²⁺ ions of these glasses have been recorded in the X-band at room temperature. Spin Hamiltonian parameters have been calculated. The molecular bonding coefficients, ð›�?² and ð›�?², have been calculated by recording the optical absorption spectra in the wavelength range 200â€�??1200 nm. It has been observed that the site symmetry around Cu²⁺ ions is tetragonally distorted octahedral. The density and glass transition temperature variation with alkali content shows non-linear behaviour. The IR studies show that the glassy system contains BO₃ and BO₄ units in the disordered manner.

[学科分类] 材料工程

[关键词] Glass transition temperature;EPR;optical absorption;glasses;bonding parameters.