Ceramic and circuit substrate and electronic circuit substrate by use thereof

摘要

A ceramic comprising a first region comprises a dielectric porcelain having an insulating layer at the crystal grain boundary of a semiconductor porcelain containing 0.50-5.30 mol parts of MnO2 and 0.02-0.40 mol parts of Y2O3 per 100 mol parts of a principal components consisting of 49.50-54.00 mol % of TiO2 and 50.50-46.00 mol % of SrO, and a second region comprising a dielectric porcelain containing further 0.40-5.00 mol parts of Al2O3, based on 100 mol parts of said principal components, in addition to the composition of the first region.