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Dielectric ceramic composition, and laminated ceramic capacitor

A technology of dielectric ceramics and components, applied in the direction of multilayer capacitors, capacitors, fixed capacitors, etc., can solve the problems of reduced permittivity and deterioration of DC bias characteristics, and can suppress the decrease of permittivity, ensure reliability, high The effect of reliability

Active Publication Date: 2012-06-13
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 laminated ceramic capacitor
  • Dielectric ceramic composition, and laminated ceramic capacitor
  • Dielectric ceramic composition, and laminated ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] First, as a ceramic raw material, prepare BaCO 3 、TiO 2 , after weighing these ceramic raw materials in a specified amount, put these weighed objects together with PSZ balls and pure water into a ball mill for mixing, pre-calcine, and synthesize the composition formula 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 subcomponent 2 o 3 ; as MO containing the second subcomponent 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 , and then prepare MnO and SiO 2 .

[0077] Next, Al was weighed with respect to 100 mole parts of the main component. 2 o 3 0.5 mole parts (1.0 mole parts converted to Al), Dy 2 o 3 1.0 mole parts (2.0 mole parts converted to Dy), 0.2 mole parts for MnO, and 0.2 mole parts for SiO 2 1.0 mole parts, and the content ratio β / α of the second subcomponent M to Al is in the range of 0.005 to 0...

Embodiment 2

[0101] As in [Example 1], BaCO was prepared as a ceramic raw material 3 、TiO 2 , After weighing these ceramic raw materials in a specified amount, put them into a ball mill together with PSZ balls and pure water to mix them, and pre-fire them. The composition is composed of Ba 1.02 TiO 3 The composite oxide formed is pulverized to obtain the main component.

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

[0103] Next, Al was weighed with respect to 100 mole parts of the main component. 2 o 3 0.1 to 3.0 mole parts (0.2 to 6.0 mole parts in Al conversion), Dy 2 o 3 1.25 mole parts (2.5 mole parts converted to Dy), 0.5 mole parts of MnO, and 0.5 mole parts of SiO 2 It was 1.5 mole parts, and the second subcomponent was weighed so that the content ratio β / α of the second subcomponent M to Al was 0.15.

[0104] Then, these main components and subcomponents were put into a ball mill again together with PSZ...

Embodiment 3

[0114] As in [Example 1], BaCO was prepared as a ceramic raw material 3 、TiO 2 After weighing these ceramic raw materials in a specified amount, they are put into a ball mill together with zirconia balls for mixing, and pre-fired to synthesize the composition formula 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, Al was weighed with respect to 100 mole parts of the main component. 2 o 3 1.2 mole parts (2.4 mole parts converted to Al), 0.15 mole parts of NiO, R 2 o 3 0.5 to 3.0 mole parts (1.0 to 6.0 mole parts in R conversion), SiO 2 1.2 parts by mole. In addition, the content ratio β / α of Al and Ni as the second subcomponent is 0.0625, which is within the range of the present invention.

[0117] Then, these ma...

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Abstract

Disclosed is a dielectric ceramic composition which contains a barium titanate composite oxide as the main component and additionally contains a first auxiliary component comprising at least Al and a second auxiliary component comprising at least one element selected from Fe, Co, Ni, Cu and Zn, wherein the content of Al is 0.02 to 6 parts by mole relative to 100 parts by mole of the main component and the ratio of the content of the second auxiliary component to the content of Al is 0.01 to 0.4 by mole. A dielectric layer (1a-1g) is formed from a sintered product of the dielectric ceramic composition. If necessary, various auxiliary components such as rare earth elements may be added to the composition. The composition ensures high reliability and good DC bias properties. Also disclosed is a laminated ceramic capacitor produced 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 high permittivity multilayer ceramic capacitors, BaTiO 3 It is the main component, and various subcomponents such as rare earth elements are added according to the required characteristics. [0003] For example, in Patent Document 1, a dielectric ceramic composition is proposed, which contains barium titanate as the main component and contains the following as subcomponents: 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 mole parts of the main component, MgO is 0.2-0.75 mole parts, Mn or Cr is 0.1-0.3 mole parts, Al 2 o 3 0.5-4 mole parts (but not including 4 mole parts), 0.3≤(Mn+Cr) / Mg≤0.5. [0004] In Patent Document 1, Al is added to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46H01B3/12H01G4/12H01G4/30
CPCC04B2235/3239C04B2235/3281H01G4/30C04B35/478C04B2235/3229C04B2235/3232C04B2235/3215C04B2235/3217C04B2235/79C04B2235/6025C04B2235/3213C04B2235/3279H01B3/12C04B35/62685C04B2235/3262C04B2235/3272C04B2235/3224C04B35/49C04B2235/3418C04B2235/3284C04B35/46C04B2235/3208C04B35/4682C04B2235/3227H01G4/1227C04B2235/3225C04B2235/3244C04B2235/3275
Inventor 冈本贵史井上德之西村仁志
Owner MURATA MFG CO LTD