Sprague Electric Company

Stephen M Neirman

Ian Burn

Formulations for a variety of air sintered ceramic barrier layer capacitors are provided wherein from 0.3 to 1.7 mole % of donor material is added to a strontium titanate and the relative amounts of strontium and titanium have been adjusted so that large-small cation balance and charge balance may be achieved by strontium vacancies, e.g. ##EQU1## These low cost materials have large grains and exhibit high dielectric constants.

SrTiO.sub.3 barrier layer capacitor

A donor modified strontium titanate formulated to become conductive when sintered in air, is further modified with a minute quantity of manganese and sintered to maturity in a nitrogen atmosphere. A paste including silver particles, and oxides of bismuth and copper is applied to two major portions of the body. The coated body is heated at about 920.degree. C. to oxidize the grain boundaries and to form silver electrodes tightly adhered to the body.

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Williamstown, MA, United States of America

Stephen M Neirman