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US 2019/0241476 A1Published application
Dielectric ceramic composition and ceramic electronic component
AssigneeShoei Chemical Inc.
InventorsTakeshi Nomura, Atsushi Nemoto, Yukari Sasaki, Kazuhiko Takemoto, Naomi Kinoshita, Yumi Takahashi
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Abstract
According to the present invention, a dielectric ceramic composition, which can be fired in a reducing atmosphere, has a high dielectric constant, has an electrostatic capacity exhibiting little change, when used as a dielectric layer of a ceramic electronic component such as a laminated ceramic capacitor even under a condition of 150 to 200° C., and has small dielectric losses at 25° C. and 200° C., can be provided.
Claims19
A dielectric ceramic composition comprising a first component and a second component, wherein:
- the first component comprises:
- an oxide of Ca in a content of 0 to 35.85 mol % in terms of CaO;
- an oxide of Sr in a content of 0 to 47.12 mol % in terms of SrO;
- an oxide of Ba in a content of 0 to 51.22 mol % in terms of BaO;
- an oxide of Ti in a content of 0 to 17.36 mol % in terms of TiO2;
- an oxide of Zr in a content of 0 to 17.36 mol % in terms of ZrO2;
- an oxide of Sn in a content of 0 to 2.60 mol % in terms of SnO2;
- an oxide of Nb in a content of 0 to 35.32 mol % in terms of Nb2O5;
- an oxide of Ta in a content of 0 to 35.32 mol % in terms of Ta2O5;
- and an oxide of V in a content of 0 to 2.65 mol % in terms of V2O5, at the specified content based on the total number of moles of the first component in terms of the above oxides;
- the first component comprises at least one selected from the oxide of Ca, the oxide of Sr, and the oxide of Ba, at least one selected from the oxide of Ti and the oxide of Zr, and at least one selected from the oxide of Nb and the oxide of Ta;
- and wherein, based on a total number of moles of the first component in terms of the above oxides, a total content of the oxide of Ca in terms of CaO, the oxide of Sr in terms of SrO, and the oxide of Ba in terms of BaO is 48.72 to 51.22 mol %;
- a total content of the oxide of Ti in terms of TiO2, the oxide of Zr in terms of ZrO2, and the oxide of Sn in terms of SnO2 is 15.97 to 17.36 mol %;
- and a total content of the oxide of Nb in terms of Nb2O5, the oxide of Ta in terms of Ta2O5, and the oxide of V in terms of V2O5 is 31.42 to 35.31 mol %;
- and
- the dielectric ceramic composition comprises at least an oxide of Mn as the second component.
13 more elements
A dielectric ceramic composition comprising a first component and a second component, wherein
- the dielectric ceramic composition comprises a compound represented by Formula (1):
- AaM1bM2cOd (1)
- wherein A is represented by Formula (2):
- Ba1-x-ySrxCay (2), wherein 0≤x≤0.920 and 0≤y≤0.700;
- M1 is at least one selected from Ti, Zr, and Sn;
- and M2 is at least one selected from Nb, Ta, and V;
- and 5.70≤a≤6.30, 1.90≤b≤2.10, 7.20≤c≤8.80, and 27.45≤d≤32.50;
- provided that when Sn is contained, a content of an oxide of Sn in terms of SnO2 based on a total number of moles of an oxide of Ti in terms of TiO2, an oxide of Zr in terms of ZrO2, and the oxide of Sn in terms of SnO2 is 15 mol % or less;
- and when V is contained, a content of an oxide of V in terms of V2O5 based on a total number of moles of an oxide of Nb in terms of Nb2O5, an oxide of Ta in terms of Ta2O5, and the oxide of V in terms of V2O5 is 7.5 mol % or less, as the first component;
- and
- the dielectric ceramic composition comprises an oxide of Mn as the second component.
8 more elements
A dielectric ceramic composition comprising a first component and a second component, wherein:
- the dielectric ceramic composition comprises a compound represented by Formula (3):
- α·Caη1M3θ1M4ϕ1Oω1-β·Srη2M3θ2M4ϕ2Oω2-γ·Baη3M3θ3M4ϕ3Oω3 (3)
- wherein η1, η2, and η3 are each independently a value within a range of 5.70 to 6.30;
- θ1, θ2, and θ3 are each independently a value within a range of 0.95 to 1.05;
- ϕ1, ϕ2, and ϕ3 are each independently a value within a range of 0.90 to 1.10;
- ω1, ω2, and ω3 are each independently a value within a range of 27.45 to 32.50;
- M3 is represented by Formula (4):
- Ti2-ρ-σZrρSnσ (4), wherein 0≤ρ≤2.0 and 0≤σ≤0.3;
- M4 is represented by Formula (5):
- Nb8-π-ϕTaπVϕ (5), wherein 0≤π≤8.0 and 0≤ϕ≤0.6;
- α, β, and γ satisfy α+β+γ=1.00;
- and wherein, when an arbitrary point on a ternary composition diagram is expressed as (α, β, γ), the compound exists in a region surrounded by line segments joining point A=(0.05, 0.95, 0.00), point B=(0.70, 0.30, 0.00), point C=(0.70, 0.00, 0.30), point D=(0.00, 0.00, 1.00), and point E=(0.00, 0.90, 0.10), as the first component;
- and
- the dielectric ceramic composition comprises an oxide of Mn as the second component.
11 more elements
Dependencies are inferred from the claim text.