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:
Feb. 18, 2003
Filed:
Jul. 31, 2001
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Abstract
A dielectric ceramic compact is provided which can decrease loss and heat generation under high frequency and high voltage or large current conditions, which exhibits a stable insulating resistance by AC or DC loading, and which can form a laminated ceramic capacitor using nickel or the like as an internal electrode material. The reduction-resistant dielectric ceramic compact is formed of an auxiliary sintering agent and a solid solution containing barium titanate as a primary component represented by the formula ABO +aR+bM, where R is a compound containing an element such as La, and M is a compound containing an element such as Mn. In addition, 1.000<A/B≦1.035, 0.005≦a≦0.12, and 0.005≦b≦0.12. Furthermore, in the ceramic, the crystalline axis ratio c/a obtained by x-ray diffraction in a temperature range of −25° C. or above satisfies 1.000≦c/a≦1.003, and in temperature dependence of relative dielectric constant measured at an electric field of 2 Vrms/mm or less and at a frequency of 1 kHz, the maximum peak is present at a temperature of below −25° C.