| 摘要 |
The lead-free glass tubing of the SiO<SUB>2</SUB>-B<SUB>2</SUB>O<SUB>3</SUB>-R<SUB>2</SUB>O-BaO-ZnO-TiO<SUB>2 </SUB>system has a composition, in percent by weight on an oxide basis, consisting essentially of: SiO<SUB>2</SUB>, 34 to 52; B<SUB>2</SUB>O<SUB>3</SUB>, 10 to 25; Al<SUB>2</SUB>O<SUB>3</SUB>, 0 to 25; Li<SUB>2</SUB>O, 2 to 6; Na<SUB>2</SUB>O, 4 to 10; K<SUB>2</SUB>O, 2 to 6; CaO, 0 to 4; BaO, 1 to 5; ZnO, 4 to 12; TiO<SUB>2</SUB>, 2 to 6, and at least one refining agent in an effective amount for refining. An encapsulated diode consisting of a diode encapsulated with this lead-free glass tubing is also disclosed.
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