Influence of Praseodymium on alumino germinate glasses containing Nd and Lainclusions

Abstract

Oxides of La, Nd and Pr have been included both singly and as pairs in Alumino-Germanate glasses at molar percentages varying from 5% to 10%. The glass transition temperatures were found by differential thermal analysis in this series of five glasses. Band gap energies were obtained from the absorption coefficient using UV-Visible spectra. The glass transition temperatures and densities of the glasses were found to increase while the band gap energies were found to decrease on addition of rare earth from La to Nd to Pr. The presence of Pr4+ ions in the network formation could be used to explain the variation of density, glass transition temperature and band gap energy in these samples.