Photoacoustic spectroscopic and electron paramagnetic resonance investigations on copper doped alkali borosilicate glasses

Abstract

Abstract. Photoacoustic absorption (PA) spectroscopic and electron paramagnetic resonance (EPR) studies were carried out on 2.5% copper doped sodium-barium borosilicate glasses. It was found that the Jahn-Teller distorted Cu 2+ species was present in a distorted octahedron with elongated z axis with the unpaired electron in d x2-y2 orbital. From the Hamiltonian parameters of EPR, Fermi contact term and dipolar terms were evaluated. By correlation of the PA data and EPR data, orbital reduction factors and bonding parameters were evaluated for the ion. The bonding parameters suggested the presence of covalency in the metal ligand bond in the glassy system.