アモルファスガラス組成物

Amorphous glass composition

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass composition for an optical waveguide, which has various characteristics (refractive index, mechanical strength or the like) suitable as a substrate material for the optical waveguide, and an ion exchange property especially good in fabricating the optical guide. <P>SOLUTION: The glass composition contains, by mass percentage based on each oxide, 50-60% SiO<SB>2</SB>, 19-27% B<SB>2</SB>O<SB>3</SB>, 7-15% Al<SB>2</SB>O<SB>3</SB>, 6-13% Na<SB>2</SB>O, 0.1-1.0% Sb<SB>2</SB>O<SB>3</SB>and/or As<SB>2</SB>O<SB>3</SB>, and 0.5-6% in total, as F(fluorine) of fluorides, obtained by substituting a portion or whole of the metal oxides mentioned above, satisfying formula: [SiO<SB>2</SB>+ B<SB>2</SB>O<SB>3</SB>]/Al<SB>2</SB>O<SB>3</SB>= 5.5-9.0 (in the ratio of mass%) and Na<SB>2</SB>O/F = 2.0-4.0 (in the ratio of mass%). <P>COPYRIGHT: (C)2004,JPO
【課題】光導波路用基板材に適した各種特性(屈折率,機械的強度等)を有し、且つ光導波路の作成において、特に良好なイオン交換性を有した光導波路用のガラス組成物を提供することにある。 【解決手段】酸化物基準の質量%でSiO 2 =50〜60%,B 2 O 3 =19〜27%,Al 2 O 3 =7〜15%,Na 2 O=6〜13%,Sb 2 O 3 および/またはAs 2 O 3 =0.1〜1.0%,および上記金属酸化物の一部または全部を置換した弗化物のF(弗素)としての合計量として0.5〜6%を含有し、[SiO 2 +B 2 O 3 ]/Al 2 O 3 =5.5〜9.0(質量%比),Na 2 O/F=2.0〜4.0(質量%比)であることを特徴とするガラス組成物。 【選択図】     なし

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