EP0722176A2
Expired / Lapsed
EP
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Monolithic ceramic capacitors
Assignee: Murata Manufacturing Co Ltd
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Filing: 1996-01-12
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Granted: —
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Expires: 2016-01-12
Abstract
Abstract Disclosed is a monolithic ceramic capacitor comprising dielectric ceramic layers and inner electrodes wherein each dielectric ceramic layer comprises an essential component having a compositional formula of (1-α-β) (BaO) m TiO 2 + αY 2 O 3 + β(Co 1-x Ni x )O (where the alkali metal content of BaTiO 3 is not more than 0.03 % by weight, 0.0025 ≦ α ≦ 0.03, 0.0025 ≦ β ≦ 0.06, 0 ≦ β/α ≦ 6,0 < x ≦ 1, 1.000 ≦ m ≦ 1.035), and a side component consisting of, relative to 100 mols of the essential component, from 0.5 to 3.0 mols of MgO and from 0.05 to 2.0 mols of MnO, and from 0.2 to 3.0 parts by weight 100 parts by weight of the sum of the main component and the side component, of oxide glass of Li 2 O-RO-(Ti,Si)O 2 (where R indicates at least one of Ba, Sr, Ca and Mg). Also disclosed is such a monolithic ceramic capacitor where the Co is replaced by Zn and x is less than 1.
Inventors
- 👤 Harunobu c/o Murata Manufacturing Co.Ltd. Sano
- 👤 Hiroyuki c/o Murata Manufacturing Co.Ltd. Wada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 18:04
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
207 words
A monolithic ceramic capacitor comprising a plurality of superposed dielectric ceramic layers, a plurality of inner electrodes disposed between the dielectric ceramic layers, wherein each dielectric ceramic layer is composed of a material comprising an essential component consisting of barium titanate having a content of impurities of alkali metal oxides of not higher than 0.03% by weight, yttrium oxide, nickel oxide, and optionally cobalt oxide having the composition (1-α-β) (BaO) m TiO 2 + αY 2 O 3 + β(Co 1-x Ni x )O where 0.0025 ≤ α ≤ 0.03, 0.0025 ≤ β ≤ 0.06, 0 < β/α ≤ 6, 0 < x ≤ 1, 1.000 ≤ m ≤ 1.035, and a side component consisting of from 0.5 to 3.0 mols, relative to 100 mols of the essential component and in terms of MgO, of magnesium oxide and from 0.05 to 2.0 mols, relative to 100 mols of the essential component and in terms of MnO, of manganese oxide, and further containing from 0.2 to 3.0 parts by weight, relative to 100 parts by weight of the sum of the main component and the side component, of oxide glass of Li 2 O-RO-(Ti, Si)O 2 where R is at least one of Ba, Sr, Ca and Mg.
Claim 2
Dependent Claim
27 words
The monolithic ceramic capacitor as claimed in claim 1, wherein each inner electrode comprises a metal selected from a group of Ni, Fe, Co, W and Mo.
Claim 3
Dependent Claim
122 words
The monolithic ceramic capacitor as claimed in claim 1, wherein the oxide glass has the composition Li 2 O-MO-RO-(Ti, Si)O 2 in which M is at least one of Zn and Mn and Li 2 O is from 2 to 45 mol%, MO is from 0 to 40 mol%, RO is from 5 to 40 mol% and (Ti, Si)O 2 is from 35 to 70 mol% provided SiO 2 of (Ti, Si)O 2 is not less than 15 mol% and contains not more than 20 parts by weight, relative to 100 parts by weight of the above-mentioned components, of at least one of Al 2 O 3 and ZrO 2 provided that ZrO 2 is not more than 10 parts by weight.
Claim 4
Dependent Claim
17 words
The monolithic ceramic capacitor as claimed in claim 1, having outer electrodes connected with the inner electrodes.
Claim 5
Dependent Claim
21 words
The monolithic ceramic capacitor as claimed in claim 4, wherein each outer electrode comprises a sintered layer of an electroconductive metal.
Claim 6
Dependent Claim
25 words
The monolithic ceramic capacitor as claimed in claim 4, wherein each outer electrode comprises a sintered layer of an electroconductive metal and a glass frit.
Claim 7
Dependent Claim
44 words
The monolithic ceramic capacitor as claimed in claim 6, wherein each outer electrode is composed of a lower layer and an upper layer and wherein the lower layer is a sintered layer comprising electroconductive metal powder and the upper layer is a plated layer.
Claim 8
Dependent Claim
44 words
The monolithic ceramic capacitor as claimed in claim 5, wherein each outer electrode is composed of a lower layer and an upper layer and wherein the lower layer is a sintered layer comprising electroconductive metal powder and the upper layer is a plated layer.
Claim 9
Dependent Claim
15 words
The monolithic ceramic capacitor as claimed in claim 1, wherein 1/3 < β/α < 3.
Claim 10
Dependent Claim
63 words
The monolithic ceramic capacitor as claimed in claim 9, wherein 0.005 < α < 0.023, 0.005 < β < 0.03, 0.5 < x < 1, 1.01 < m < 1.02, and the side component contains 1.2 to 2 mols of magnesium oxide and from 0.4 to 0.7 mols of manganese oxide, and further contains 0.2 to 1 parts by weight of oxide glass.
Claim 11
Dependent Claim
216 words
A monolithic ceramic capacitor comprising a plurality of superposed dielectric ceramic layers, a plurality of inner electrodes disposed between the dielectric ceramic layers, and the outer electrodes connected with the inner electrodes, wherein each dielectric ceramic layer is composed of a material comprising an essential component consisting of barium titanate having a content of impurities of alkali metal oxides of not higher than 0.03 % by weight, yttrium oxide, zinc oxide and nickel oxide having the composition (1-α-β) (BaO) m TiO 2 + αY 2 O 3 + β(Zn 1-x -Ni x )O where 0.0025 ≤ α ≤ 0.03, 0.0025 ≤ β ≤ 0.08, 0 < β/α ≤ 8, 0 < x < 1, 1.000 ≤ m ≤ 1.035, and a side component consisting of from 0.2 to 2.5 mols, relative to 100 mols of the essential component and in terms of MgO, of magnesium oxide and from 0.05 to 2.0 mols, relative to 100 mols of the essential component and in terms of MnO, of manganese oxide, and further containing from 0.2 to 3.0 parts by weight, relative to 100 parts by weight of the sum of the main component and the side component, of oxide glass of Li 2 O-RO-(Ti, Si)O 2 where R indicates at least one of Ba, Sr, Ca and Mg.
Claim 12
Dependent Claim
27 words
The monolithic ceramic capacitor as claimed in claim 11, wherein each inner electrode comprises a metal selected from a group of Ni, Fe, Co, W and Mo.
Claim 13
Dependent Claim
122 words
The monolithic ceramic capacitor as claimed in claim 11, wherein the oxide glass has the composition Li 2 O-MO-RO-(Ti, Si)O 2 in which M is at least one of Zn and Mn and Li 2 O is from 2 to 45 mol%, MO is from 0 to 40 mol%, RO is from 5 to 40 mol% and (Ti, Si)O 2 is from 35 to 70 mol% provided SiO 2 of (Ti, Si)O 2 is not less than 15 mol% and contains not more than 20 parts by weight, relative to 100 parts by weight of the above-mentioned components, of at least one of Al 2 O 3 and ZrO 2 provided that ZrO 2 is not more than 10 parts by weight.
Claim 14
Dependent Claim
17 words
The monolithic ceramic capacitor as claimed in claim 11, having outer electrodes connected with the inner electrodes.
Claim 15
Dependent Claim
22 words
The monolithic ceramic capacitor as claimed in claim 14, wherein each outer electrode comprises a sintered layer of an electroconductive metal powder.
Claim 16
Dependent Claim
26 words
The monolithic ceramic capacitor as claimed in claim 14, wherein each outer electrode comprises a sintered layer of an electroconductive metal powder and a glass frit.
Claim 17
Dependent Claim
49 words
The monolithic ceramic capacitor as claimed in claim 16, wherein each outer electrode is composed of a lower layer and an upper layer and wherein the lower layer is a sintered layer comprising an electroconductive metal powder and a glass frit and the second layer is a plated layer.
Claim 18
Dependent Claim
49 words
The monolithic ceramic capacitor as claimed in claim 15, wherein each outer electrode is composed of a lower layer and an upper layer and wherein the lower layer is a sintered layer comprising an electroconductive metal powder and a glass frit and the second layer is a plated layer.
Claim 19
Dependent Claim
15 words
The monolithic ceramic capacitor as claimed in claim 11, wherein 0.25 < β/α < 4.
Claim 20
Dependent Claim
63 words
The monolithic ceramic capacitor as claimed in claim 19, wherein 0.004 < α < 0.025, 0.005 < β < 0.08, 0.05 < x < 1, 1.005 < m < 1.02, and the side component contains 0.6 to 2 mols of magnesium oxide and from 0.4 to 0.7 mols of manganese oxide, and further contains 0.8 to 1.5 parts by weight of oxide glass.
References Cited (Backward Citations)
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