Dielectric ceramic composition and ceramic electronic components

Patent metadata

Field	Value
Publication number	US-11524923-B2
Application number	US-201917046698-A
Country	US
Kind code	B2
Filing date	Mar 15, 2019
Priority date	Apr 11, 2018
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

Provided is a dielectric ceramic composition including a first component and a second component, wherein the first component comprises an oxide of Ca of 0.00 mol % to 35.85 mol % an oxide of Sr of 0.00 mol % to 47.12 mol %, an oxide of Ba of 0.00 mol % to 51.22 mol %, an oxide of Ti of 0.00 mol % to 17.36 mol %, an oxide of Zr of 0.00 mol % to 17.36 mol %, an oxide of Sn of 0.00 mol % to 2.60 mol %, an oxide of Nb of 0.00 mol % to 35.32 mol %, an oxide of Ta of 0.00 mol % to 35.32 mol %, and an oxide of V of 0.00 mol % to 2.65 mol %, and the second component includes at least (a) an oxide of Mn of 0.005% by mass to 3.500% by mass and (b) an oxide of Cu and/or an oxide of Ru.

First claim

The invention claimed is:

1. A dielectric ceramic composition comprising:
a first component; and
a second component, wherein
as a content ratio relative to a total number of moles of the first component when converted into following oxides, the first component comprises an oxide of Ca of 0.00 mol % to 35.85 mol % in terms of CaO, an oxide of Sr of 0.00 mol % to 47.12 mol % in terms of SrO, an oxide of Ba of 0.00 mol % to 51.22 mol % in terms of BaO, an oxide of Ti of 0.00 mol % to 17.36 mol % in terms of TiO 2 , an oxide of Zr of 0.00 mol % to 17.36 mol % in terms of ZrO 2 , an oxide of Sn of 0.00 mol % to 2.60 mol % in terms of SnO 2 , an oxide of Nb of 0.00 mol % to 35.32 mol % in terms of Nb 2 O 5 , an oxide of Ta of 0.00 mol % to 35.32 mol % in terms of Ta 2 O 5 , and an oxide of V of 0.00 mol % to 2.65 mol % in terms of V 2 O 5 ;
the first component comprises at least one oxide selected from the oxide of Ca, the oxide of Sr, and the oxide of Ba, at least one oxide selected from the oxide of Ti and the oxide of Zr, and at least one oxide selected from the oxide of Nb and the oxide of Ta as essential components, and a total content ratio 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 mol % to 51.22 mol %, a total content ratio of the oxide of Ti in terms of TiO 2 , the oxide of Zr in terms of ZrO 2 , and the oxide of Sn in terms of SnO 2 is 15.97 mol % to 17.36 mol %, and a total content ratio of the oxide of Nb in terms of Nb 2 O 5 , the oxide of Ta in terms of Ta 2 O 5 , and the oxide of V in terms of V 2 O 5 is 31.42 mol % to 35.31 mol % relative to the total number of moles of the first component when converted into the oxides; and
as a content ratio relative to a total mass of the first component when converted into the oxides, the second component comprises at least (a) an oxide of Mn of 0.005% by mass to 3.500% by mass in terms of MnO and (b) one or both of an oxide of Cu and an oxide of Ru.

2. The dielectric ceramic composition according to claim 1 , wherein, as the content ratio relative to the total mass of the first component when the first component is converted into CaO, SrO, BaO, TiO 2 , ZrO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and V 2 O 5 , the second component comprises one or both of an oxide of Cu of 0.010% by mass or more and less than 0.080% by mass in terms of CuO and an oxide of Ru of 0.050% by mass or more and less than 0.300% by mass in terms of RuO 2 .

3. The dielectric ceramic composition according to claim 1 , wherein an oxide of D (D is at least one element selected from Li, Mg, Si, Cr, Al, Fe, Co, Ni, Zn, Ga, Ge, In, W, Mo, Y, Hf, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) is included as the second component.

4. The dielectric ceramic composition according to claim 1 , wherein the dielectric ceramic composition comprises a tungsten bronze type crystal phase.

5. The dielectric ceramic composition according to claim 1 , wherein relative dielectric constant at 25° C. is 100.0 or more.

6. The dielectric ceramic composition according to claim 1 , wherein a change rate in electrostatic capacity is within a range of −20.0% to 5.0% in a temperature range of −55° C. to 200° C.

7. The dielectric ceramic composition according to claim 1 , wherein a dielectric loss (tan δ) at 25° C. is 10.0% or less and a dielectric loss (tan δ) at 200° C. is 10.0% or less.

8. The dielectric ceramic composition according to claim 1 , wherein an insulation resistance value at 200° C. is 40 MΩ or more and less than 100 MΩ.

9. A ceramic electronic component comprising:
a dielectric layer formed of the dielectric ceramic composition as claimed in claim 1 ; and
an electrode layer comprising a base metal as a conductive component.

10. The ceramic electronic component according to claim 9 , wherein the base metal is at least one metal selected from nickel and copper.

11. The ceramic electronic component according to claim 9 , wherein a plurality of the dielectric layers and a plurality of the electrode layers are laminated.

12. A dielectric ceramic composition comprising:
a first component; and
a second component, wherein
as the first component, a compound represented by a following general formula (1):
A a M 1 b M 2 c O d   (1)

(in the formula (1), A is represented by a general formula (2):
Ba 1-x-y Sr x Ca y   (2)

(in the formula (2), 0≤x≤0.920 and 0≤y≤0.700); M 1 is at least one element selected from Ti, Zr, and Sn; M 2 is at least one element 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) is included
(with the proviso that, when Sn is included, a content ratio of the oxide of Sn in terms of SnO 2 relative to a total number of moles of the oxide of Ti in terms of TiO 2 , the oxide of Zr in terms of ZrO 2 , and the oxide of Sn in terms of SnO 2 is 15.00 mol % or less and when V is included, a content ratio of the oxide of V in terms of V 2 O 5 relative to a total number of moles of the oxide of Nb in terms of Nb 2 O 5 , the oxide of Ta in terms of Ta 2 O 5 , and the oxide of V in terms of V 2 O 5 is 7.50 mol % or less); and
as a content ratio relative to a total mass of the first component when the first component is converted into CaO, SrO, BaO, TiO 2 , ZrO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and V 2 O 5 , the second component comprises at least (a) an oxide of Mn of 0.005% by mass to 3.500% by mass in terms of MnO and (b) one or both of an oxide of Cu and an oxide of Ru.

13. A dielectric ceramic composition comprising:
a first component; and
a second component, wherein
a compound represented by a following general formula (3):
α.Ca η1 M 3 θ1 M 4 ϕ1 O ω1 -β.Sr η2 M 3 θ2 M 4 ϕ2 O ω2 -γ.Ba η3 M 3 θ3 M 4 ϕ3 O ω3   (3)

(in the formula (3), η1, η2, and η3 are each independently values within a range of 5.70 to 6.30; θ1, θ2, and θ3 are each independently values within a range of 0.95 to 1.05; ϕ1, ϕ2, and ϕ3 are each independently values within a range of 0.90 to 1.10; ω1, ω2, and ω3 are each independently values within a range of 27.45 to 32.50; M 3 is represented by a general formula (4):
Ti 2-ρ-σ Zr ρ Sn σ   (4)

(in the formula (4), 0≤ρ≤2.0 and 0≤σ≤0.3); M 4 is represented by a general formula (5):
Nb 8-π-ψ Ta π V ψ   (5)

(in the formula (5), 0≤π≤8.0 and 0≤ψ≤0.6); and α, β, and γ satisfy α+β+γ=1.00) and when an arbitrary point in a ternary composition diagram is represented as (α, β, γ), the compound existing within a range surrounded by line segments linking a point A=(0.05, 0.95, 0.00), a point B=(0.70, 0.30, 0.00), a point C=(0.70, 0.00, 0.30), a point D=(0.00, 0.00, 1.00), and a point E=(0.00, 0.90, 0.10) is included as the first component; and
as a content ratio relative to a total mass of the first component when the first component is converted into CaO, SrO, BaO, TiO 2 , ZrO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and V 2 O 5 , the second component comprises at least (a) an oxide of Mn of 0.005% by mass to 3.500% by mass in terms of MnO and (b) one or both of an oxide of Cu and an oxide of Ru.

14. The dielectric ceramic composition according to claim 13 , wherein the first component is a compound existing within a range surrounded by line segments linking a point A′=(0.05, 0.95, 0.00), a point B′=(0.60, 0.40, 0.00), a point C′=(0.70, 0.20, 0.10), a point D′=(0.70, 0.10, 0.20), a point E′=(0.55, 0.00, 0.45), a point F′=(0.40, 0.00, 0.60), a point G′=(0.10, 0.10, 0.80), a point H′=(0.00, 0.00, 1.00), a point I′=(0.00, 0.40, 0.60) a point J′=(0.20, 0.40, 0.40), a point K′=(0.00, 0.70, 0.30), and a point L′=(0.00, 0.9

Assignees

• Shoei Chemical Ind Co

Inventors

• Nomura Takeshi
• Sasaki Yukari

Classifications

• C04B2235/604

  Pressing at temperatures other than sintering temperatures · CPC title

• C04B2235/6567

  Treatment time · CPC title

• C04B2235/3215

  Barium oxides or oxide-forming salts thereof · CPC title

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title

• H01G4/008

  Selection of materials · CPC title