Electronic polarizability and interaction parameter of gadolinium tungsten borate glasses with high WO3 content

Abstract

Glasses with the compositions of 25Gd2O3–xWO3–(75−x)B2O3 with x=25–65 were prepared by using a conventional melt quenching method, and their electronic polarizabilities, optical basicities Λ(no), and interaction parameters A(no) were estimated from density and refractive index measurements in order to clarify the feature of electronic polarizability and bonding states in the glasses with high WO3 contents. The optical basicity of the glasses increases monotonously with the substitution of WO3 for B2O3, and contrary the interaction parameter decreases monotonously with increasing WO3 content. A good linear correlation was observed between Λ(no) and A(no) and between the glass transition temperature and A(no). It was proposed that Gd2O3 oxide belongs to the category of basic oxide with a value of A(no)=0.044Å−3 as similar to WO3. The relationship between the glass formation and electronic polarizability in the glasses was discussed, and it was proposed that the glasses with high WO3 and Gd2O3 contents would be a floppy network system consisting of mainly basic oxides.