Lead perovskite based ceramic compositions without any free lead oxide

摘要

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%.