CERAMIC MATERIAL COMPOSITION, CERAMIC SUBSTRATE AND IRREVERSIBLE CIRCUIT ELEMENT

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There is provided a ceramic material composition advantageously used as a material for a ceramic substrate (1) containing a resistor (8) disposed therein, for example, an isolator. A ceramic material composition including 10 to 45 percent by weight of a BaO-TiO2-ReO3/2 ceramic composition, the ceramic composition being represented by xBaO-yTiO2-zReO3/2 (wherein x, y, and z each represent a mole percent, 8 ≤ x ≤ 18, 52.5 ≤ y ≤ 65, and 20 ≤ z ≤ 40, and x + y + z = 100; and Re represents a rare-earth element); 5 to 40 percent by weight of alumina; and 40 to 65 percent by weight of a borosilicate glass composition containing 4 to 17.5 percent by weight of B2O3, 28 to 50 percent by weight of SiO2, 0 to 20 percent by weight of Al2O3, and 36 to 50 percent by weight of MO (wherein MO represents at least one compound selected from CaO, MgO, SrO, and BaO), wherein the total content of the BaO-TiO2-ReO3/2 ceramic composition and alumina is 35 percent by weight or more.