A high dielectric constant glass-ceramic material comprising small conducting grains based on BaTiO.sub.3 and/or SrTiO.sub.3 on the order of about 0.5-10.0 .mu.m surrounded by a thin microcrystalline insulating barrier layer at the grain boundary about 0.01-0.10 .mu.m thick wherein the conductivity of the grains is enhanced by addition of about 0.1-4.0 mol % of a dopant selected from among Group V elements, Ge and Si substantially incorporated in the bulk lattice of the grains upon Ti sites. A novel process for forming the glass-ceramic material is also disclosed.