Influence of lanthanum on structural and magneto-optic properties of diamagnetic glasses of the TeO2–WO3–PbO system

Abstract

This paper is focused on the design, fabrication and characterization of tellurite glass of composition TeO₂–WO₃–PbO in terms of La₂O₃ addition. The effect of La₂O₃ on the structure of the obtained glasses has been investigated by means of spectrophotometric and ellipsometric measurements in the UV-Vis-NIR spectral region and then relevant optical parameters have been calculated. The DC magnetic susceptibility study has been used to investigate the influence of lanthanum ion (La³⁺) on the structural and magnetic properties of the investigated glass system. Based on DTA, PALS and Raman studies, it can be stated that modification of the basic structural units with La³⁺ ions, namely the TeO₄ trigonal bipyramid (tbp) and the TeO₃ trigonal pyramid (tp), both having a lone pair of electrons occupying one of the equatorial positions, affect the magnetic properties of these glasses.