Abstract: A sinterable ceramic composition which comprises a barium titanate based dielectric precursor powder which has a temperature coefficient of capacitance, TC, of .+-.15% over the temperature range -55.degree. to 125.degree. C., in admixture with from 0.25 to 2.0% by weight of an additive which is selected from the group consisting of ZrSiO.sub.4, Al.sub.2 O.sub.3, SiO.sub.2, precursors therefor and mixtures thereof, the composition having an average particle size in the range of from 0.6 to 0.8 micrometers and, when fired, having a dielectric constant of above 2500, a TC of .+-.15% over the temperature range of -55.degree. to +125.degree. C. and a porosity of less than 0.7% with no pores greater than 3.5 micrometers average diameter.

Abstract: A ceramic composition which includes Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 or the oxide precursors thereof, in admixture with barium copper oxide of the formula BaCuO.sub.2 as a sinter aid therefor. The compositions do not contain any free lead oxide and have high dielectric constants, e.g. above 8000, and low loss factors, e.g. below 3%.

Abstract: A method of sintering a ceramic material composed of alkaline earth metal titanate and mixtures thereof, wherein the ceramic material is mixed with a sintering aid of a mixture of a mixed metal oxide of the formula BaCuO.sub.2 and an oxide selected from the group consisting of tungsten trioxide, molybdenum trioxide and mixtures thereof, and sintering the mixture.