Dielectric ceramic composition and ceramic parts

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PROBLEM TO BE SOLVED : To obtain a ceramic having high dielectric constant and Q value, almost free from fluctuation of the characteristics and capable of being sintered at a low temperature by incorporating, as a first sub-component, SiO2 glass free from a Pb oxide in a specific ratio and, as a second sub-component, an Mn oxide in a specified ratio into a particular main component. SOLUTION : This composition is expressed by the formula x(BaαCaβ Srγ)O- y[(TiO2)1-m(ZrO2)m]-zRe2O3(wherein, x+y+z=100; α+β+γ=1; 0=0.1 and 1.5 and <=20 pts.wt., expressed in terms of MnO, each content being based on 100 pts.wt. of the main component whose molar compositional ratio (BaαCaβSrγ)O, [(TiO2)1-m (ZrO2)m], Re2O3} of (BaαCaβSrγ)O, [(TiO2)1-m(ZrO2)m] and Re2O3 is contained in a region surrounded by points A (10, 85, 5), B (10, 59, 31), C (7, 59, 34) and D (7, 85, 8).