Claims
- 1. A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 .mu.m in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 .mu.m and a Curie temperature of 50.degree.-115.degree. C. in amounts of 2-40 mole %; and
- (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and
- (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
- 2. A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 .mu.m in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 .mu.m and a Curie temperature of 50.degree.-115.degree. C. in amounts of 2-40 mole %;
- the perovskite structure barium titanate solid solution being:
- (a) a barium titanate zirconate solid solution represented by the general formula (I):
- BaTi.sub.1-x Zr.sub.x O.sub.3
- wherein x is a numeral defined as 0.02.ltoreq.x.ltoreq.0.15, or
- (b) a barium strontium titanate solid solution represented by the general formula (II):
- Ba.sub.1-y Sr.sub.y TiO.sub.3
- wherein y is a numeral defined as 0.03.ltoreq.y.ltoreq.0.20, or
- (c) a barium titanate stannate solid solution represented by the general formula (III):
- BaTi.sub.1-z Sn.sub.z O.sub.3
- wherein z is a numeral defined as 0.01.ltoreq.z.ltoreq.0.10,
- (d) a complex solid solution of two or more of the above solid solutions, or
- (e) a mixture of two or more of the above solid solutions, and;
- (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and
- (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
- 3. A ceramic dielectric which produced by sintering a composition comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 .mu.m in amounts of 98-60 mole % and a perovskite type barium titanate solid solution which has average particle size of 0.1-1.5 .mu.m and a Curie temperature of 50.degree.-115.degree. C. in amounts of 2-40 mole %;
- the perovskite type barium titanate solid solution being:
- (a) a barium titanate zirconate solid solution represented by the general formula (I):
- BaTi.sub.1-x Zr.sub.x O.sub.3
- wherein x is a numeral defined as 0.02.ltoreq.x.ltoreq.0.15, or
- (b) a barium strontium titanate solid solution represented by the general formula (II):
- Ba.sub.1-y Sr.sub.y TiO.sub.3
- wherein y is a numeral defined as 0.03.ltoreq.y.ltoreq.0.20, or
- (c) a barium titanate stannate solid solution represented by the general formula (III):
- BaTi.sub.1-z Sn.sub.z O.sub.3
- wherein z is a numeral defined as 0.01.ltoreq.z.ltoreq.0.10,
- (d) a complex solid solution of two or more of the above solid solutions, or
- (e) a mixture of two or more of the above solid solutions, and;
- (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and
- (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
- 4. A method of producing a ceramic dielectric which comprises: sintering a composition at temperatures of 1000.degree.-1400.degree. C., the composition comprising: a mixture of barium titanate which has average particle size of 0.1-1.5 .mu.m in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 .mu.m and a Curie temperature of 50.degree.-115.degree. C. in amounts of 2-40 mole %;
- the perovskite structure barium titanate solid solution being:
- (a) a barium titanate zirconate solid solution represented by the general formula (I):
- BaTi.sub.1-x Zr.sub.x O.sub.3
- wherein x is a numeral defined as 0.02.ltoreq.x.ltoreq.0.15, or
- (b) a barium strontium titanate solid solution represented by the general formula (II):
- Ba.sub.1-y Sr.sub.y TiO.sub.3
- wherein y is a numeral defined as 0.03.ltoreq.y.ltoreq.0.20, or
- (c) a barium titanate stannate solid solution represented by the general formula (III):
- BaTi.sub.1-z Sn.sub.z O.sub.3
- wherein z is a numeral defined as 0.01.ltoreq.z.ltoreq.0.10,
- (d) a complex solid solution of two or more of the above solid solutions, or
- (e) a mixture of two or more of the above solid solutions, and;
- (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and
- (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Priority Claims (3)
Number |
Date |
Country |
Kind |
63-115629 |
May 1988 |
JPX |
|
63-312715 |
Dec 1988 |
JPX |
|
63-312716 |
Dec 1988 |
JPX |
|
Parent Case Info
This application is a continuation of now abandoned application Ser. No. 07/350,035 filed on May 10, 1989, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4643984 |
Abe et al. |
Feb 1987 |
|
4677083 |
Uedaira et al. |
Jun 1987 |
|
4764494 |
Sakabe et al. |
Aug 1988 |
|
4767732 |
Furukawa et al. |
Aug 1988 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
0258944 |
Apr 1986 |
EPX |
8808830 |
Nov 1988 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Elektronik Gera Dielectric Ceramic, Koehler et al. 1985 "Chem. Abstracts". |
Continuations (1)
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Number |
Date |
Country |
Parent |
350035 |
May 1989 |
|