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US 5,378,662 AGranted
Glass, dielectric composition, multilayer wiring substrate, and multilayer ceramic capacitor
AssigneeTDK Corporation
InventorHiroshi Tsuyuki
Life of this patent
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Abstract
A glass comprising 10-40 mol % as Ln.sub.2 O.sub.3 of a lanthanide oxide wherein Ln is a lanthanide element, 30-60 mol % as SiO.sub.2, B.sub.2 O.sub.3 and GeO.sub.2 in total of silicon dioxide, boron oxide and/or germanium oxide, and 16-40 mol % as Al.sub.2 O.sub.3 of aluminum oxide has high Tg, a low average coefficient of linear expansion and a high dielectric constant. A dielectric composition containing the glass and a dielectric material is useful in the fabrication of multilayer wiring substrates and multilayer ceramic capacitors.
Claims10
A dielectric composition comprising a glass comprising
- 10 to 40 mol % calculated as Ln.sub.2 O.sub.3 of a lanthanide oxide wherein Ln is a lanthanide element,
- 30 to 60 mol % calculated as SiO.sub.2, B.sub.2 O.sub.3 and GeO.sub.2 in total of at least one glass-forming oxide selected from the group consisting of silicon dioxide, boron oxide and germainium oxide, and
- 16 to 40 mol % calculated as Al.sub.2 O.sub.3 of aluminum oxide,
- and a ceramic dielectric material having a higher specific inductive capacity than the glass.
1 more element
Dependencies are inferred from the claim text.