Importance

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Abstract

A glass composition includes, as main content components, by mass %, a TeO₂ content percentage of 50% to 80%, a Bi₂O₃ content percentage of 0% to 30%, a WO₃ content percentage of 0% to 30%, a ZnO content percentage of 0% to 30%, a BaO content percentage of 0% to 30%, a GeO₂ content percentage of 0% to 30%, and a Ga₂O₃ content percentage of 0% to 30%, wherein at least any one of additive target elements is introduced, the additive target elements including, Si⁴⁺ of 1 mg/kg to 1,500 mg/kg, B³⁺ of 1 mg/kg to 1,500 mg/kg, P⁵⁺ of 1 mg/kg to 1,500 mg/kg, Li⁺ of 1 mg/kg to 1,500 mg/kg, Na⁺ of 1 mg/kg to 1,500 mg/kg, K⁺ of 1 mg/kg to 1,500 mg/kg, Mg²⁺ of 1 mg/kg to 1,500 mg/kg, Ca²⁺ of 1 mg/kg to 1,500 mg/kg, Al³⁺ of 1 mg/kg to 1,500 mg/kg, and Sr²⁺ of 1 mg/kg to 1,500 mg/kg.

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First Claim