Infrared Absorption of Antimonate Glass

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  • YOKOTA Ryosuke
    Central Research Laboratory, Tokyo Shibaura Electric Company
  • NAKAI Yasuo
    Central Research Laboratory, Tokyo Shibaura Electric Company

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  • アンチモンガラスの赤外吸収
  • アンチモンガラス ノ セキガイ キュウシュウ

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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.<br>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.<br>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.<br>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.<br>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.

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