Infrared Absorption of Antimonate Glass

Abstract

It was confirmed that the area of the glass forming region of the system Sb2O3-Al2O3-R2O (Na2O+K2O) increases with the addition of SiO2 or GeO2.The glasses containing 5% SiO2 or GeO2 melted under oxidizing condition (o. glass) gave a different infrared transmission from those melted under neutral condition (n. glass). Also the difference in such properties as the color, density, softening point, and density were observed.O. glass has better infrared transmittance and chemical durability than n. glass which gave broad absorption band between 750 and 1000cm-1 and 1520cm-1. These two absorption bands at 1420cm-1, and sharp absorption bands at 1420 and 1520cm-1. These absorption bands at 1420 and 1520cm-1 appeared when o. glass is devitrified.AlSbO4 crystal has the absorption band at 1420cm-1. After heating with Na2O the crystal gave a broad absorption band between 750 and 1000cm-1.It was, therefore, concluded that n. glass contains the crystallite region, and the chain segments composed of Al3+Sb5+O tetrahedra are built up more easily in o. glass than in n. glass; also it may be assumed that SiO2 or GeO2 bridges the chain segment of AlSbO4 tetrahedra.