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Electronic device, dielectric ceramic composition and the production method

A technology of ceramic composition and electronic components, which is applied in the parts of fixed capacitors, electrical components, dielectrics of fixed capacitors, etc., can solve the problems of deterioration of life under high temperature load, difficulty in thin layering, multi-layering, etc., to ensure sufficient reliability. The effect of sex, large capacity

Active Publication Date: 2007-08-29
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, for example, when the interlayer thickness of the dielectric layer is reduced to 5 μm, the high-temperature load life may deteriorate, making it difficult to reduce the thickness and multilayer.

Method used

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  • Electronic device, dielectric ceramic composition and the production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] First, main component raw materials and subcomponent raw materials are prepared. As the main component raw material, BaTiO with an average particle size of 0.2 μm is used 3 . As a subcomponent raw material, MgCO is used 3 (1st subcomponent), (Ba 0.6 Ca 0.4 ) SiO 3 (second subcomponent), V 2 o 5 (the third subcomponent), Y 2 o 3 (4th subcomponent), Tb 4 o 7 (the fifth subcomponent), MnCO 3 (the 6th sub-ingredient). Among them, MgCO 3 and MnCO 3 Oxides are formed upon sintering to be present in the dielectric ceramic composition in the form of MgO and MnO, respectively. (Ba 0.6 Ca 0.4 ) SiO 3 (hereinafter also referred to as BCG) was produced by the following method.

[0105] For BCG, BaCO 3 , CaCO 3 and SiO 2 BCG was produced by wet mixing with a ball mill for 16 hours, drying, and sintering in air at 1150° C., and then wet pulverizing with a ball mill for 100 hours.

[0106] Next, according to the relative 100 moles of BaTiO 3 The compositions of ...

Embodiment 2

[0155] Capacitor samples were produced in the same manner as in Example 1 except that the composition of the subcomponents was set to the composition shown in Table 2, and the same characteristic evaluation as in Example 1 was performed. The results are shown in Table 2.

[0156] Table 2

[0157]

sample

serial number

Subcomponents

**(of dielectric particles

average grain size)

/

(Main ingredient of raw material

The average particle size)

electrical characteristics

No. 4

number 5

4th and 5th

total moles

The molar ratio of

No. 1

2nd

No. 3

number 6

relative dielectric

constant

εr

Dielectric loss

tanδ

X7R Features

high temperature

load life

[h]

CR product

[μF·MΩ]

R1 conversion

R2 conv...

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PUM

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Abstract

A dielectric ceramic composition comprising a main component including BaTiO 3 , a fourth subcomponent including an oxide of R1 (note that R1 is at least one selected from Y, Ho, Er, Tm, Yb and Lu) and a fifth subcomponent including an oxide of R2 (note that R2 is at least one selected from Dy, Tb, Gd and Eu); wherein a total number of moles of R1 and R2 with respect to 100 moles of the main component is 2 to 6 moles when calculated as a conversion of the R1 and a conversion of the R2, and a ratio of the fifth subcomponent to the total number of moles of R1 and R2 with respect to 100 moles of the main component is in a relationship of 0.5<=R2 / (R1 + R2)<=0.75 when calculated as a conversion of the R1 and a conversion of the R2. According to the present invention, high temperature load lifetime and capacity-temperature characteristics can be well balanced even when the dielectric layer of the electronic device is made thin, so that a sufficiently reliable dielectric ceramic composition can be provided.

Description

technical field [0001] The present invention relates to a dielectric ceramic composition and a method for producing the same, and more particularly to a dielectric ceramic composition for electronic parts and a method for producing the same. (Accelerated life of insulation resistance) and capacity temperature characteristics are also good, and have high reliability. Background technique [0002] A laminated ceramic capacitor as an example of an electronic component is used in various electronic devices. In recent years, the demand for miniaturization and high performance of electronic equipment has been increasing, and laminated ceramic capacitors are no exception, and are rapidly developing towards miniaturization, low price, and high capacity. [0003] Under such a trend, the thickness of the dielectric layer per layer in the laminated ceramic capacitor is being reduced, and thus a dielectric ceramic composition capable of maintaining the reliability of the capacitor even...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468H01G4/12C04B35/622
CPCC04B2235/3418C04B2235/5445C04B2235/3239C04B2235/3206H01G4/30C04B2235/36C04B2235/3215H01G4/1227C04B35/4682C04B2235/3208C04B2235/6025C04B2235/3436C04B35/468C04B2235/3241C04B2235/3258C04B2235/3262C04B2235/3224C04B2235/3225C04B2235/3256C04B2235/785H01G4/12
Inventor 细野雅和井口俊宏樱井弹佐藤淳小岛畅小岛隆
Owner TDK CORPARATION
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