Abstract: A lead-free piezoelectric ceramic composition includes a first crystal phase made of an alkali niobate/tantalate type perovskite oxide having piezoelectric properties, and a second crystal phase made of an M-Ti—O spinel compound (where the element M is a monovalent to quadrivalent element).

Abstract: A lead-free piezo-electric porcelain composition which contains a main phase having voids and which is formed of a first crystal phase composed of an alkali niobate/tantalate-based perovskite oxide having piezo-electric characteristics; and a sub-phase containing a second crystal phase composed of an A2B6O13-based compound (where the element A is a monovalent element and the element B is one or more divalent to hexavalent elements). The sub-phase fills voids present in the main phase.

Abstract: Provided is a sintered oxide compact that has high electric conductivity and a small B-value (temperature coefficient), and is suitable for use as an electrically conductive material, and a circuit board that uses the sintered oxide compact. The sintered oxide compact is represented by a composition formula: REaCobNicOx (where RE represents a rare earth element, a+b+c=1, and 1.3?x?1.7), the sintered oxide compact includes a perovskite phase with a perovskite-type oxide crystal structure, and the a, b, and c satisfy the following relationships: 0.459?a?0.535, 0.200?b?0.475, and 0.025?c?0.300.

Abstract: Provided is a sintered oxide compact that has high electric conductivity and a small B-value (temperature coefficient), and is suitable for use as an electrically conductive material, and a circuit board that uses the sintered oxide compact. The sintered oxide compact is represented by a composition formula: REaCobNicOx (where RE represents a rare earth element, a+b+c=1, and 1.3?x?1.7), the sintered oxide compact includes a perovskite phase with a perovskite-type oxide crystal structure, and the a, b, and c satisfy the following relationships: 0.459?a?0.535, 0.200?b?0.475, and 0.025?c?0.300.

Abstract: A dielectric material comprising: a composition represented by aBaO.bTiO2.cREO3/2.dBiO3/2, wherein a, b, c and d each independently represent a molar ratio satisfying the following requirements: a+b+c+d=1, 0.09?a?0.16, 0.54?b?0.62, 0.20?c?0.34 and 0?d?0.10; and RE represents a rare earth metal; and from 5 to 50 parts by mass, per 100 parts by mass of the composition, of a glass containing a component represented by kBaO.lZnO.mB2O3.nSiO2, wherein k, l, m and n each independently represent a composition percentage satisfying the following requirements: k+l+m+n=100, 25?k?55, 5?1?30, 15?m?35 and 5?n?30.

Abstract: A dielectric material comprising: a composition represented by aBaO.bTiO2.cREO3/2.dBiO3/2, wherein a, b, c and d each independently represent a molar ratio satisfying the following requirements: a+b+c+d=1, 0.09?a?0.16, 0.54?b?0.62, 0.20?c?0.34 and 0?d?0.10; and RE represents a rare earth metal; and from 5 to 50 parts by mass, per 100 parts by mass of the composition, of a glass containing a component represented by kBaO.lZnO.mB2O3.nSiO2, wherein k, l, m and n each independently represent a composition percentage satisfying the following requirements: k+l+m+n=100, 25?k?55, 5?1?30, 15?m?35 and 5?n?30.