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Browse Prior Art Database

Stabilization of Electrical Properties of Glass

IP.com Disclosure Number: IPCOM000094776D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Sunners, B: AUTHOR

Abstract

Alkali is a common and desirable component in glass compositions and serves to improve the physical properties. However, alkali also has the undesirable effect of reducing the electrical stability of the glass. The electrical stability is defined as the resistance to polarization and/ or other changes under the influence of an applied electrical field. This effect seriously limits the application of these compositions in electrical components and the like.

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Stabilization of Electrical Properties of Glass

Alkali is a common and desirable component in glass compositions and serves to improve the physical properties. However, alkali also has the undesirable effect of reducing the electrical stability of the glass. The electrical stability is defined as the resistance to polarization and/ or other changes under the influence of an applied electrical field. This effect seriously limits the application of these compositions in electrical components and the like.

When bismuth trioxide is included as a component in glass compositions, as a substitute for alkali on a mol to mol basis, the desirable physical properties common to compositions containing alkali are retained. The compositions containing bismuth do not exhibit reduced electrical stability. Because of the low mobility of bismuth, as compared to sodium, the migration of ions within the glass is reduced correspondingly, increasing the electrical stability. The increased stability is demonstratable in a comparison of compositions having approximately PbO 50%, Al(2)O(3) 5%, B(2)O(3) 12%, SiO(2) 30% stabilized with titanium and zirconium, and containing alternately 2% sodium oxide and bismuth trioxide. A comparison of the two compositions indicates both have desirably low softening points, but the resistivity of the glass containing sodium oxide is materially less than the glass containing bismuth.

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