High dielectric constant ceramics which can be sintered at low temperatures
AssigneeInternational Business Machines Corporation
InventorCharles M. McIntosh
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Abstract
The present invention relates to high dielectric constant ceramics which can be sintered to maximum density at low temperatures. The ceramic structures consist primarily of a skeleton which constitutes the refractory phase and an interstitial glass which serves simultaneously as a bonding agent and a fluxing agent which enables the ceramic structure to densify in the low temperature range. Among the preferred materials used to form the skeleton are polycrystalline materials which have a high dielectric constant, for example, barium titanate, complex dielectric materials such as lead bismuth niobate and the like. The interstitial glasses required are lead silicate based glasses.
Claims16
A high dielectric constant ceramic body which is non-porous by the Zyglo dye test and 0% porous by the water absorption test, which has been sintered at a temperature of from about 850.degree.C to about 950.degree.C to densify said body, which consists essentially of a major portion of a polycrystalline ceramic refractory material and a lead silicate based interstitial glass selected from the glasses from the binary system PbO-SiO.sub.2 the ternary system PbO-Al.sub.2 O.sub.3 -SiO.sub.2 and the ternary system PbO-ZrO.sub.2 -SiO.sub.2 and which has a dielectric constant of from about 230 to about 550.
Dependencies are inferred from the claim text.