A METHOD FOR THE FABRICATION OF MICROWAVE DIELECTRIC CERAMIC COMPOSITION

Application 154/DEL/2002 published 2007-02-09, filed 2002-02-28
A method for the fabrication of dielectric composition of the formula xMO-YLa2O3-ZTiO2 wherein M is selected from Sr and Ca and x:y:z = 1:2:4, 2:2:5, 1:2:5, 1:4:9, the method comprising mixing, firing and shaping powders of CaCO3 or SrCO3, TiO2, and La2O3 tro form a mass of dielectric material; and firing the mass a temperature above 1200deg.C and for a time period sufficient, and cooling to a temperature greater than or equal to 25 deg.C so that the materials have dielectric constantsgreater than 40 at microwave frequencies and at a temperature of 25 deg. C and temperature coefficient of resonate frequency ranging between -25 and +20 ppm/deg.C.

Applicant

1)COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
:RAFI MARG, NEW DELHI-110001, INDIA Delhi India

Inventor

1)MAILADIL THOMAS SEBASTIAN 2)NARAYANA IYER SANTHA 3)ISUHAK NASEEMABEEVI JAWAHAR

International Info

Classification: C04B 35/40