CERAMIC MATERIAL COMPOSITION, CERAMIC SUBSTRATE AND IRREVERSIBLE CIRCUIT ELEMENT

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A ceramic material composition, which comprises 10 to 45 wt %% of a ceramic composition represented by xBaO-yTiO2-zReO3/2 (wherein x, y and z each represent mole %%, 8 <= x <= 18, 52.5 <= y <= 65, 20 <= x <= 40, x + y + Z = 100, and Re represents a rare earth element), 5 to 40 wt %% of alumina, and 40 to 65 wt %% of a glass composition containing B2O3 in an amount of 4 to 17.5 wt %%, SiO2 in an amount of 28 to 50 wt %%, Al2O3 in an amount of 0 to 20 wt %% and MO (wherein MO is at least one of CaO, MgO, SrO and BaO) in an amount of 36 to 50 wt %%, wherein the total content of the ceramic composition and alumina is 35 wt %% or more. The above ceramic material composition is advantageously used as a material for a ceramic substrate (1) for housing a resistance element (8) such as an isolator. © KIPO & WIPO 2007