STRUCTURE OF PROPERTIES OF LANTHANUM GALLIOGERMANATE GLASSES

Lanthanum galliogermanate glasses were prepared. Raman spectra, molar volumes, glass transition temperatures acid activation energies for gl ass transition and crystallization were obtained. For glasses having t he same La2O3/GeO2 ratio, the molar volumes increase with the Ga2O3 co ntent, 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 Ga2 O3/GeO2 ratio, the molar volumes increase with La2O3 content, and the glass transition temperatures increase as the ratio of La2O3/GeO2 incr eases. The change of glass structure and its properties with compositi on is correlated with the concentration of lanthanum ion. (C) 1998 Els evier Science B.V. All rights reserved.