The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 30, 1997
Filed:
Apr. 22, 1996
Galeb H Maher, North Adams, MA (US);
Veerabhadrarao Bheemineni, Latham, NY (US);
MRA Laboratories, Inc., North Adams, MA (US);
Abstract
A ceramic powder mixture is made by combining from 96 to 98 mole percent of precursors of a stoichiometric barium zirconate titanate (BZT) wherein zirconium amounts to from 13.5 to 15.0 mole percent, and adding from 0.5 to 1.5 mole percent niobium or lanthanum, from 1.2 to 2.6 weight percent of a cadmium silicate sintering flux, essentially no lead, and from zero to 2 mole % of an alkaline earth metal to obtain in the powder mixture a ratio (A/B) of the large cations (A) to the small cations (B) in the range from 1.024 to 1.035. The mixture is calcined to obtain a powder comprised of agglomerates of essentially identical composition within the ranges given above. This powder of agglomerates may then be formed into a compact body that is sintered and fired to maturity at 1100.degree. C. to produce a mature dielectric ceramic body meeting the Y5V standard and having a dielectric constant greater than 10,000 at the Curie temperature.