Abstract: A piezoelectric ceramic composition includes: a composite oxide, as a main component thereof, represented by the composition formula, Pba[(Zn1/3Nb2/3)xTiyZrz]O3, wherein a, x, y and z satisfy the following relations, 0.96?a?1.03, 0.005?x?0.047, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1, and the following additives in the indicated percentages by mass in relation to the main component, Cu as a first additive, in a content ?, in terms of Cu2O, falling within a range 0<??0.5%; at least one of Li, Co, Ni, Ga and Mg, as a second additive, in a content ?, in terms of carbonate for Li, falling within a range 0<??0.1%, in a content ?1, in terms of oxide for Co, Ni and Ga, falling within a range 0<?1?0.2%, and in a content ?2, in terms of carbonate for Mg, falling within a range 0<?2?0.2%; and at least one of Ta, Nb, W and Sb, as a third additive, in a content ?, in terms of oxide, falling within a range 0<??0.6%.

Abstract: Provided is a piezoelectric ceramic composition capable of being sintered at low temperatures and in a low-oxygen reductive atmosphere and capable of attaining a sufficient displacement even at high voltages of 1 kV/mm or more. The piezoelectric ceramic composition includes: a composite oxide, as a main constituent thereof, represented by the following composition formula; Cu and/or Ag, each as a first additive, Cu being included in a content ?, in terms of Cu2O, falling within a range 0<??0.5% by mass and Ag being included in a content ?, in terms of Ag2O, falling within a range 0<??0.4% by mass, in relation to the main constituent; wherein: composition formula: Pba[(Zn1/3Nb2/3)xTiyZrz]O3, where 0.96?a?1.03, 0.005?x<0.05, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1.

Abstract: A piezoelectric ceramic composition includes: a composite oxide, as a main component thereof, represented by the composition formula, Pba[(Zn1/3Nb2/3)xTiyZrz]O3, wherein a, x, y and z satisfy the following relations, 0.96?a?1.03, 0.005?x?0.047, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1; and the following additives in the indicated percentages by mass in relation to the main component, Cu as a first additive, in a content ?, in terms of Cu2O, falling within a range 0<??0.5%; at least one of Dy, Nd, Eu, Gd, Tb, Ho and Er, as a second additive, in a content ?, in terms of oxide, falling within a range 0<??0.3%; and at least one of Ta, Nb, W and Sb, as a third additive, in a content ?, in terms of oxide, falling within a range 0<??0.6%.

Abstract: A piezoelectric ceramic composition includes: a composite oxide, as a main component thereof, represented by the composition formula, Pba[(Zn1/3Nb2/3)xTiyZrz]O3, wherein a, x, y and z satisfy the following relations, 0.96?a?1.03, 0.005?x?0.047, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1, and the following additives in the indicated percentages by mass in relation to the main component, Cu as a first additive, in a content ?, in terms of Cu2O, falling within a range 0<??0.5%; at least one of Li, Co, Ni, Ga and Mg, as a second additive, in a content ?, in terms of carbonate for Li, falling within a range 0<??0.1%, in a content ?1, in terms of oxide for Co, Ni and Ga, falling within a range 0<?1?0.2%, and in a content ?2, in terms of carbonate for Mg, falling within a range 0<?2?0.2%; and at least one of Ta, Nb, W and Sb, as a third additive, in a content ?, in terms of oxide, falling within a range 0<??0.6%.

Abstract: A piezoelectric ceramic composition includes: a composite oxide, as a main component thereof, represented by the composition formula, Pba[(Zn1/3Nb2/3)xTiyZrz]O3, wherein a, x, y and z satisfy the following relations, 0.96?a?1.03, 0.005?x?0.047, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1; and the following additives in the indicated percentages by mass in relation to the main component, Cu as a first additive, in a content ?, in terms of Cu2O, falling within a range 0<??0.5%; at least one of Dy, Nd, Eu, Gd, Tb, Ho and Er, as a second additive, in a content ?, in terms of oxide, falling within a range 0<??0.3%; and at least one of Ta, Nb, W and Sb, as a third additive, in a content ?, in terms of oxide, falling within a range 0<??0.6%.

Abstract: Provided is a piezoelectric ceramic composition capable of being sintered at low temperatures and in a low-oxygen reductive atmosphere and capable of attaining a sufficient displacement even at high voltages of 1 kV/mm or more. The piezoelectric ceramic composition includes: a composite oxide, as a main constituent thereof, represented by the following composition formula; Cu and/or Ag, each as a first additive, Cu being included in a content ?, in terms of Cu2O, falling within a range 0<??0.5% by mass and Ag being included in a content ?, in terms of Ag2O, falling within a range 0<??0.4% by mass, in relation to the main constituent; wherein: composition formula: Pba[(Zn1/3Nb2/3)xTiyZrz]O3, where 0.96?a?1.03, 0.005?x<0.05, 0.42?y?0.53, 0.45?z?0.56, and x+y+z=1.

Abstract: For the purpose of preventing the degradation of the piezoelectric strain properties when Cu is used for internal electrodes, there is provided a piezoelectric ceramic composition including: a composite oxide, as a main constituent thereof, represented by (Pba-bMeb) [(Zn1/3Nb2/3)xTiyZrz]O3 with the proviso that 0.96?a?1.03, 0?b?0.1, 0.05?x?0.15, 0.25?y?0.5, 0.35?z?0.6, and x+y+z=1, and Me represents at least one selected from Sr, Ca and Ba; and at least one selected from Co, Mg, Ni, Cr and Ga as a first additive to the main constituent in a content of 0.5% by mass or less (not inclusive of 0) in terms of oxide, wherein an electrode made of Cu is to be disposed on the piezoelectric ceramic composition.

Abstract: A piezoelectric ceramic composition has as a chief ingredient a composite oxide that has Pb, Ti and Zr as constituent elements. It contains as a first accessory ingredient at least one element selected from the group consisting of Mn, Co, Cr, Fe and Ni in an amount of 0.2 mass % or less excluding 0 mass % in terms of an oxide. As the first accessory ingredient, at least one species selected from the ingredients represented by CuOx, wherein x?0, can be adopted. In this case, the content of the first accessory ingredient is 3.0 mass % or less excluding 0 mass %. The piezoelectric ceramic composition is fired under reducing and firing conditions. The reducing and firing conditions include a firing temperature in the range of 800° C. to 1200° C. and an oxygen partial pressure in the range of 1×10?10 to 1×10?6 atm., for example.