SINTERED OXIDE COMPACT AND CIRCUIT BOARD USING SAME

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Provided is a sintered oxide compact that has high electroconductivity and a small B-constant (temperature coefficient), and that is suitable as an electroconductive material; also provided is a circuit board using same. A sintered oxide compact characterized in including a perovskite phase having a perovskite-type oxide crystal structure, and in being represented by the composition formula REaCobNicOx (where RE represents a rare earth element, a + b + c = 1, and 1.3 = x = 1.7). In the formula, a, b, and c satisfy the following relationships : 0.459 = a = 0.535, 0.200 = b = 0.475, 0.025 = c = 0.300