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:
Jul. 13, 1982
Filed:
Feb. 25, 1981
Jean-Claude Mage, Paris, FR;
Claude Deljurie, Paris, FR;
Thomson-CSF, Paris, FR;
Abstract
A dielectric material having a high dielectric constant, very low high-frequency losses and very high temperature stability is prepared in particular by sintering previously ground raw materials in an oxidizing atmosphere at 1450.degree. C. The molar composition of the raw materials is as follows: t, TiO.sub.2 ; x, SnO.sub.2 ; y, ZrO.sub.2 ; a, NiO; b, La.sub.2 O.sub.3 ; where t is between 0.9 and 1.1, x is between 0.1 and 0.4 moles, y is between 0.6 and 0.9, a is between 0.015 and 0.06 moles, b is between 0.01 and 0.1 moles with an addition of iron of 0.0035 mole in respect of one mole of TiO.sub.2 obtained, for example, from the use of steel equipment for the grinding operation. When x is in the vicinity of 0.35, the coefficient of thermal variation .tau..sub.f is reduced to zero and the quality criterion Q.f is high.