Glasses and glass-ceramics
US3935019A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Feb 12, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B3/087
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Thermally crystallizable glasses are disclosed of the system: EQU RO -- Nb.sub.2 O.sub.5 -- GeO.sub.2 wherein RO is a BaO or SrO. Also disclosed are thermally crystallizable glasses of the system PbO -- Nb.sub.2 O.sub.5 -- GeO.sub.2. Glass-ceramics made from these glass systems have high dielectric constants and low dissipation factors or loss tangents, which glasses and glass-ceramics are suitable for use as capacitors and dielectrics, and particularly for thick-film dielectric pastes utilized in the manufacture of micro-electronic printed circuits. By varying the heat treatment schedule for crystallization of the glass to a glass-ceramic, a specific high dielectric constant coming within a prescribed range can be imparted to the finished glass-ceramic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.