Background: The alkali borate glasses containing transition metal ions are of
great interest for opto-electronic applications. However, there is no systematic study on the
lithium strontium borate glasses doped with CuO.
Objectives: The aim of this study is to present a complete structural and optical view of
this glass system and the influence of CuO content on these parameters.
Methods: Li2O-SrO-B2O3 glasses containing different concentrations of CuO were
prepared using the melt quenching technique. The prepared glasses have been investigated
by measuring physical properties like density and molar volume, structural properties using
FTIR spectroscopy and Raman spectroscopy, optical properties using UV-Vis
spectroscopy and the compositional effects on spin-Hamiltonian parameters using EPR
Results: The X-ray diffraction patterns of all the studied samples revealed the amorphous
nature. The density, molar volume and refractive index, optical band gap energy and
Urbach energy vary with the concentration of CuO. The IR and Raman spectroscopic
studies revealed that copper ions lead to structural rearrangements through the conversion
of three-coordinated boron into four-coordinated boron and thereby reducing the number
of non-bridging oxygen atoms. The electron paramagnetic resonance spectra of all the
studied glasses exhibit resonance signals characteristic of Cu2+ ions. The values of spin-
Hamiltonian parameters indicate that the Cu2+ ions are present in the distorted octahedral
Conclusion: The analysis of these results indicated that majority of the copper ions exist in
Cu2+ state in these glasses up to 0.8 mol% of CuO and above this concentration some of
these ions may convert into Cu+ state. The dependency of various physical, structural and
optical properties on the concentration of copper ions shows good application prospective
of this glass system for different applications.