Ceramic composition and electronic part using the same
AssigneesMarcon Electronics Co., Ltde., Kabushiki Kaisha Toshiba
InventorsKiyoji Handa, Satoshi Mukaeda, Hideyuki Kanai, Yohachi Yamashita, Osamu Furukawa, Mitsuo Harata
Life of this patent
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Abstract
A ceramic composition which forms, when sintered, a dielectric having a crystal structure represented by the general formula: [Pb.sub.1-x A.sub.x ].sub.[A] (B.sub.1,B.sub.2).sub.[B] O.sub.3 where A is at least one element selected from the group consisting of Ca, Sr, Ba, Ag, La and Nd, B.sub.1 is at least one element selected from the group consisting of Mg, Zn, Ni, Co, Fe, Mn and In, B.sub.2 is at least one element selected from the group consisting of Nb, W, Ta and Sb, x is 0 to 0.5, and the molar ratio of [A]/[B] is 0.995 or more, but 0.99 or less.
Claims6
A dielectric ceramic composition comprising oxides of Pb, A, B.sub.1 and B.sub.2 in amounts sufficient to provide, when sintered, a dielectric of a crystal structure represented by general formula:
- (Pb.sub.1-x A.sub.x).sub.a {(B.sub.1).sub.1-y, (B.sub.2).sub.y }.sub.b O.sub.3 (I)
- where A is at least one element selected from the group consisting of Ca, Sr, Ba, Ag, La and Nd, B.sub.1 is at least one element selected from the group consisting of Mg, Zn, Ni, Co, Fe, Mn and In, B.sub.2 is at least one element selected from the group consisting of Nb, W, Ta and Sb, x is more than 0 to 0.5, y is 1/2 when B.sub.2 is W, or 1/3 when B.sub.2 is Nb, Ta or Sb, a represents the total number of mols of the elements constituting A-site comprising Pb.sub.1-x and A.sub.x, and b represents the total number of mols of the element constituting B-site comprising B.sub.1 and B.sub.2, and the ratio a/b is from 0.95 to 0.99.
A dielectric having a crystal structure presented by general formula:
- (Pb.sub.1-x A.sub.x).sub.a {{B.sub.1).sub.1-y,(B.sub.2).sub.y }.sub.b O.sub.3 (I)
- where A is at least one element selected from the group consisting of Ca, Sr, Ba, Ag, La and Nd, B.sub.1 is at least one element selected from the group consisting of Mg, Zn, Ni, Co, Fe, Mn and In, B.sub.2 is at least one element selected from the group consisting of Nb, W, Ta and Sb, x is more than 0 to 0.5, y is 1/2 when B.sub.2 is W, or 1/3 when B.sub.2 is Nb, Ta or Sb, a represents the total number of mols of the elements constituting A-site comprising Pb.sub.1-x and A.sub.x, and b represents the total number of mols of the element constituting B-site comprising B.sub.1 and B.sub.2, and the ratio a/b is from 0.95 to 0.99.
Dependencies are inferred from the claim text.