Abstract: A ceramic material powder comprised of main ingredient particles formed by barium titanate having on their surfaces a covering layer comprised of a secondary ingredient additive, wherein when an average radius of the main ingredient particles is “r” and an average radius of the covering layer is “?r”, the ?r is controlled to a range of 0.015 r to 0.055 r, thereby enabling acquisition of a multilayer ceramic capacitor or other electronic device satisfying both the X7R characteristic prescribed in the EIAJ standard and B characteristic prescribed in the Japan Industrial Standard (JIS), that is, excellent in temperature stability of the electrostatic capacity, having a good insulation resistance value, relative dielectric constant, or other characteristics, and having a long accelerated life of the insulation resistance.

Abstract: A ceramic material powder comprised of main ingredient particles formed by barium titanate having on their surfaces a covering layer comprised of a secondary ingredient additive, wherein when an average radius of the main ingredient particles is “r” and an average radius of the covering layer is “?r”, the ?r is controlled to a range of 0015r to 0.055r, thereby enabling acquisition of a multilayer ceramic capacitor or other electronic device satisfying both the X7R characteristic prescribed in the EIAJ standard and B characteristic prescribed in the Japan Industrial Standard (JIS), that is, excellent in temperature stability of the electrostatic capacity, having a good insulation resistance value, relative dielectric constant, or other characteristics, and having a long accelerated life of the insulation resistance.

Abstract: A piezoelectric ceramic composition by which it is possible to obtain piezoelectric ceramic chip parts having a high electromechanical coupling factor and a high heat-resistance property, and also having a good temperature coefficient of resonance frequency while maintaining the high heat-resistance property and low change over time. The piezoelectric ceramic compositions of the present invention include: (1) a first piezoelectric ceramic composition expressed by the general formula Pb.sub.y [(Mg.sub.1/3 Nb.sub.2/3).sub.a (Yb.sub.1/2 Nb.sub.1/2).sub.b Ti.sub.c Zr.sub.d ]O.sub.3 (where a+b+c+d=1), wherein 0.95.ltoreq.y.ltoreq.1.05, 0.01.ltoreq.a.ltoreq.0.15, 0.01.ltoreq.b.ltoreq.0.10, 0.30.ltoreq.c.ltoreq.0.60, and 0.25.ltoreq.d.ltoreq.0.55; (2) a second piezoelectric ceramic composition expressed by the general formula(Pb.sub.1-x Me.sub.x)[(Mg.sub.1/3 Nb.sub.2/3).sub.a (Yb.sub.1/2 Nb.sub.1/2).sub.b Ti.sub.c Zr.sub.d ]O.sub.