Vitrified magnesium titanate ceramic dielectric prodn. - with low dielectric constant from mixt. contg. manganese oxide

摘要

Prodn. of a vitrified ceramic dielectric contg. Mg and opt. Ca and/or Sr titanate(s), with low dielectric constant, is carried out by vitrifying a mixt. of 40-98 wt.% Mg and =59.9% Ca titanate and/or =59.9% Sr titanate and 0.1-1% Mn carbonate or oxide, 0-10% La or La-didymium oxide, 0-3% Fe oxide and 0-5% Al oxide or bentonite, or precursors forming these cpds. during vitrification. The dielectric has a wide sintering interval. Its colour contrasts with that of silver layers, which facilitates automatic finishing, using sorting equipment with photocells before adjustment of the capacity (by grinding). Layers of the dielectric do not stick together if fired in space-saving stacks.