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Dielectric ceramic composition and multilayer ceramic capacitor

A technology of dielectric ceramics and components, which is applied in the direction of laminated capacitors, capacitors, fixed capacitors, etc., can solve the problems of DC bias characteristic degradation, permittivity reduction, etc., to ensure reliability, suppress permittivity reduction, high reliability effect

Active Publication Date: 2015-09-23
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the dielectric ceramic composition of Patent Document 1 is used in an environment where a DC bias is applied, even if the reliability can be ensured, there is a problem that the decrease in permittivity due to the DC bias is large, and the DC bias characteristics deteriorate. point

Method used

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  • Dielectric ceramic composition and multilayer ceramic capacitor
  • Dielectric ceramic composition and multilayer ceramic capacitor
  • Dielectric ceramic composition and multilayer ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] First, prepare BaCO as a ceramic raw material 3 , TiO 2 , After weighing these ceramic raw materials in a prescribed amount, put these weighed objects into a ball mill together with PSZ balls and pure water to mix, perform pre-sintering, and synthesize a compositional Ba 1.01 TiO 3 The composite oxide formed is pulverized to obtain the main component powder.

[0076] Next, prepare Al containing Al as the first sub-component 2 O 3 ; As the MO containing the second subsidiary component M x Fe 2 O 3 (FeO 3 / 2 ), CoO, NiO, CuO and ZnO; Dy containing Dy as the third subcomponent R 2 O 3 , Then prepare MnO and SiO 2 .

[0077] Next, weigh the Al with respect to 100 parts by mole of the main component 2 O 3 0.5 mole part (converted to Al is 1.0 mole part), Dy 2 O 3 1.0 mole part (converted to Dy as 2.0 mole parts), MnO is 0.2 mole parts, SiO 2 The content ratio β / α of the second subcomponent M relative to Al is in the range of 0.005 to 0.45 as shown in Table 1, and the MO is weighed i...

Embodiment 2

[0101] As in [Example 1], BaCO was prepared as a ceramic material 3 , TiO 2 , After weighing these ceramic raw materials, together with PSZ balls and pure water, they are put into the ball mill to be mixed, pre-fired, and synthesized by the composition formula Ba 1.02 TiO 3 The composite oxide formed is pulverized to obtain the main component.

[0102] Next, prepare Al as a subsidiary component 2 O 3 , Fe 2 O 3 , CoO, NiO, CuO and ZnO, Dy 2 O 3 , MnO, SiO 2 .

[0103] Next, weigh the Al with respect to 100 parts by mole of the main component 2 O 3 0.1~3.0 mol parts (0.2~6.0 mol parts converted to Al), Dy 2 O 3 1.25 mole parts (converted to Dy as 2.5 mole parts), MnO is 0.5 mole parts, SiO 2 In addition, the content ratio β / α of the second subcomponent M with respect to Al was 0.15, and the second subcomponent was weighed in this manner.

[0104] Then, these main components and subcomponents are put into a ball mill together with PSZ balls and pure water again and mixed, thereby obtain...

Embodiment 3

[0114] As in [Example 1], BaCO was prepared as a ceramic material 3 , TiO 2 , After weighing these ceramic raw materials in a prescribed amount, they are put into a ball mill together with zirconia balls to be mixed and pre-fired to synthesize a compositional BaTiO 3 The composite compound formed is pulverized to obtain the main component.

[0115] Second, prepare Al 2 O 3 , NiO and SiO 2 , In addition, prepare R containing R as the third subcomponent 2 O 3 (Wherein R represents La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Y, Ho, Er, Tm, Yb, and Lu.).

[0116] Next, weigh the Al with respect to 100 parts by mole of the main component 2 O 3 1.2 mole parts (converted to Al is 2.4 mole parts), NiO is 0.15 mole parts, R 2 O 3 0.5 to 3.0 mole parts (1.0 to 6.0 mole parts converted to R), SiO 2 It is 1.2 mole parts. The content ratio β / α of Al and Ni as the second subsidiary component is 0.0625, which is within the scope of the present invention.

[0117] Then, these main components and auxiliary c...

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Abstract

A dielectric ceramic composition contains a barium titanate based composite oxide as its main constituent, and contains a first accessory constituent including at least Al and a second accessory constituent including one or more elements selected from among Fe, Co, Ni, Cu, and Zn, wherein the content of the Al is 0.02 to 6 parts by mol with respect to 100 parts by mol of the main constituent, and the content ratio of the second accessory constituent to the Al is 0.01 to 0.4 in terms of mols. Dielectric layers are formed from a sintered body of the dielectric ceramic composition. The addition of various types of accessory elements such as rare-earth elements is possible, if necessary. This invention achieves a dielectric ceramic composition which is capable of ensuring favorable DC bias characteristics while ensuring high reliability, and a laminated ceramic capacitor using the dielectric ceramic composition.

Description

Technical field [0001] The present invention relates to a dielectric ceramic composition and a multilayer ceramic capacitor using the same. Background technique [0002] As a dielectric ceramic composition for multilayer ceramic capacitors with high permittivity, BaTiO 3 It is the main component, and various secondary components such as rare earth elements are added according to the required characteristics. [0003] For example, Patent Document 1 proposes a dielectric ceramic composition, which contains barium titanate as the main component and contains the following as secondary components: MgO; sintering aid; 2 O 5 , MoO 3 , WO 3 At least one selected from; specific rare earth oxides; CaZrO 3 Or CaO+ZrO 2 ; MnO or Cr 2 O 3 ; And Al 2 O 3 , Relative to 100 mol parts of the main component, MgO is 0.2-0.75 mol parts, Mn or Cr is 0.1-0.3 mol parts, Al 2 O 3 It is 0.5-4 mole parts (but not including 4 mole parts), 0.3≤(Mn+Cr) / Mg≤0.5. [0004] In Patent Document 1, in addition to the ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/46H01B3/12H01G4/12H01G4/30
CPCC04B2235/3279C04B2235/3227C04B2235/3281C04B2235/3224H01G4/30C04B2235/3418C04B2235/3215C04B2235/3229C04B2235/79C04B2235/3244C04B2235/3232C04B2235/3272C04B2235/3225C04B35/49C04B2235/3239H01G4/1227C04B2235/3284C04B2235/6025C04B2235/3275C04B35/62685C04B35/4682H01B3/12C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3262
Inventor 冈本贵史井上德之西村仁志
Owner MURATA MFG CO LTD