Dielectric composition and electronic component

Patent metadata

Field	Value
Publication number	US-10752552-B2
Application number	US-201916356363-A
Country	US
Kind code	B2
Filing date	Mar 18, 2019
Priority date	Mar 30, 2018
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A dielectric composition having a high temperature property, good specific permittivity and AC breakdown voltage, and low dielectric loss at normal temperature, even though lead is not substantially used. The dielectric composition includes barium titanate, strontium titanate, and bismuth calcium titanate constituting a main component and a subcomponent. The dielectric composition includes a first subcomponent constituted by at least one selected from a compound including manganese, a compound including iron, and a compound including chromium, and the first sub component is included in a ratio of 0.02 to 0.19 wt % in terms of total of MnCo3, Fe2O3, and Cr2O3 with respect to 100 wt % of the main component, and the dielectric composition includes a second subcomponent which is a compound including niobium, and the second subcomponent is included in a ratio of 0.1 to 3 wt % in terms of Nb2O5 with respect to 100 wt % of the main component.

First claim

What is claimed is:

1. A dielectric composition comprising barium titanate, strontium titanate, and bismuth calcium titanate constituting a main component and a subcomponent, wherein
when “a” mol % represents a content of barium titanate in terms of BaTiO 3 , “b” mol % represents a content of strontium titanate in terms of SrTiO 3 , and “c” mol % represents a content of bismuth calcium titanate in terms of CaBi 4 Ti 4 O 15 in a composition of the main component, and a+b+c=100 is satisfied,
said “a”, “b”, and “c” are values within a range surrounded by four points of following point A, point B, point C, and point D in a ternary phase diagram,
point A: (a, b, c)=(69.3, 30.2, 0.5)
point B: (a, b, c)=(64.8, 30.2, 5)
point C: (a, b, c)=(83, 12, 5)
point D: (a, b, c)=(99.5, 0, 0.5),
the dielectric composition includes a first subcomponent constituted by at least one selected from the group consisting of a compound including manganese, a compound including iron, and a compound including chromium, and the first sub component is included in a ratio of 0.02 wt % or more and 0.19 wt % or less in terms of total of MnCO 3 , Fe 2 O 3 , and Cr 2 O 3 with respect to 100 wt % of the main component, and
the dielectric composition includes a second subcomponent which is a compound including niobium, and the second subcomponent is included in a ratio of 0.1 wt % or more and 3 wt % or less in terms of Nb 2 O 5 with respect to 100 wt % of the main component.

2. The dielectric composition according to claim 1 , wherein said “a”, “b”, and “c” are values within a range surrounded by four points of point A′, point B′, point C′, and point D′ in a ternary phase diagram
point A′: (a, b, c)=(75.1, 23.9, 1)
point B′: (a, b, c)=(75.1, 20.4, 4.5)
point C′: (a, b, c)=(84.8, 10.7, 4.5)
point D′: (a, b, c)=(93, 6, 1).

3. The dielectric composition according to claim 1 , wherein a weight ratio of the second subcomponent with respect to a total weight of the first subcomponent is 2 or more and 30 or less.

4. The dielectric composition according to claim 2 , wherein a weight ratio of the second subcomponent with respect to a total weight of the first subcomponent is 2 or more and 30 or less.

5. An electronic component comprising the dielectric composition according to claim 1 .

6. An electronic component comprising the dielectric composition according to claim 2 .

7. An electronic component comprising the dielectric composition according to claim 3 .

8. An electronic component comprising the dielectric composition according to claim 4 .

Assignees

• Tdk Corp

Inventors

• Liping Liang
• Hailong Liu
• Ohtsu Daisuke

Classifications

• H01G4/30

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• C04B2235/3236

  Alkaline earth titanates · CPC title

• C04B2235/3213

  Strontium oxides or oxide-forming salts thereof · CPC title

• C04B2235/3234

  Titanates, not containing zirconia · CPC title

• H01G4/1227

  based on alkaline earth titanates · CPC title