Structure and properties of lanthanum galliogermanate glasses

Lanthanum galliogermanate glasses were prepared. Raman spectra, molar volumes, glass transition temperatures and activation energies for glass transition and crystallization were obtained. For glasses having the same La₂O₃/GeO₂ ratio, the molar volumes increase with the Ga₂O₃ content, and the glass transition temperatures, activation energies for glass transition and crystallization, increase initially then decrease as the ratio of Ga₂O₃/GeO₂ increases. For glasses having the same Ga₂O₃/GeO₂ ratio, the molar volumes increase with La₂O₃ content, and the glass transition temperatures increase as the ratio of La₂O₃/GeO₂ increases. The change of glass structure and its properties with composition is correlated with the concentration of lanthanum ion.