Ceramic, circuit substrate and electronic circuit substrate by use thereof and process for producing ceramic

摘要

The present invention provides a ceramic having a first region comprising a dielectric porcelain having an insulating layer at the crystal grain boundary of a semiconductor porcelain containing 0.50 to 5.30 mol parts of MnO2 and 0.02 to 0.40 mol parts of Y2O3 per 100 mol parts of the principal components comprising 49.50 to 54.00 mol % of TiO2 and 50.50 to 46.00 mol % of SrO, and a second region comprising a dielectric porcelain containing further 0.40 to 5.00 mol parts of Al2O3 and 0.05 to 2.00 mol parts of SiO2 per 100 mol parts of the principal components in addition to the composition of the first region, and also provides a circuit substrate and an electronic circuit substrate using the same ceramic.