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Dielectric ceramic composition and ceramic electronic device

A technology of dielectric ceramics and compositions, applied in the field of dielectric ceramic compositions, can solve problems such as reliability reduction, and achieve the effect of improving reliability

Active Publication Date: 2016-09-28
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that if the dielectric layer is thinned along with the miniaturization of multilayer ceramic capacitors, even if the same voltage is applied, the electric field strength to the dielectric layer becomes stronger, reducing reliability

Method used

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  • Dielectric ceramic composition and ceramic electronic device
  • Dielectric ceramic composition and ceramic electronic device
  • Dielectric ceramic composition and ceramic electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] As the raw material powder of barium titanate as the main component, Ba with a specific average particle diameter (120 to 170 nm) shown in Table 1 below was prepared. u Ti v o 3 Powder (u / v=1.004).

[0125] Prepare Eu 2 o 3 Powder, prepare Yb as raw material powder of Ra oxide 2 o 3 Powder, prepare Tb as raw material powder of oxides of Rb 2 o 3.5 Powder and Y 2 o 3 powder.

[0126] SiO was prepared as the raw material powder of Si oxide as the second subcomponent 2 powder.

[0127] Furthermore, as the raw material powder of the oxide of Ba, prepare BaCO 3 powder. Prepare MnCO as raw material powder of Mn oxide 3 powder. As a raw material powder of V oxide, prepare V 2 o 5 powder. MgO powder was prepared as a raw material powder of an oxide of Mg.

[0128] In addition, the raw material powders of all the above-mentioned subcomponents were preliminarily pulverized so that the average particle diameters of all the above-mentioned subcomponents were adju...

Embodiment 2

[0165] In addition to barium titanate (Ba u Ti v o 3 (u / v=1.004)) was set to 150 nm in average particle size, and the types of oxides of rare earth Ra and Rb were set to the values ​​shown in Table 2, and the others were the same as sample No. 8 of Example 1. Multilayer ceramic capacitor samples of sample numbers 21 to 27 were produced, and the same characteristic evaluation as in Example 1 was performed. The results are shown in Table 2.

[0166] [Table 2]

[0167]

[0168] According to Table 2, even if the types of rare earth Ra and Rb oxides are changed as in sample numbers 21 to 27, the segregation rate is 5.0% or less, and the average cross-sectional area of ​​segregated particles is 0.075 μm 2 In the following cases, the capacity temperature characteristics and the high-temperature load life were all good.

Embodiment 3

[0170] A multilayer ceramic capacitor sample of sample number 31 was produced in the same manner as sample number 4 of Example 1 except for the firing conditions, and the same characteristic evaluation as in Example 1 was performed. The firing conditions of Sample No. 31 were such that the temperature increase rate was set to 2000° C. / hour, and the holding time was set to 0.2 hours. The results are shown in Sample No. 31 in Table 3.

[0171] In addition, the preparation of the dielectric material raw material was carried out by the method shown below. Except for the preparation of the dielectric material raw material, other samples No. 32 and 33 were produced in the same manner as the sample No. 4 of Example 1, and the same procedure as in Example 1 was carried out. characteristic evaluation.

[0172] For the preparation of the dielectric raw material of sample No. 32, with respect to BaTiO as the main component 3 , only the oxide of Si and the oxide of Ra, that is, Yb 2 o ...

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Abstract

A dielectric ceramic composition is characterized by including a main component having a perovskite crystal structure expressed by general formula ABO3, a first sub-component of an oxide of a rare earth element, and a second sub-component of an oxide of Si, and at least dielectric particles having a core-shell structure and segregated particles, in which a concentration of the rare earth element in the segregated particles is two or more times an average concentration of the rare earth element in a shell portion of the dielectric particles having the core-shell structure, and an area of the region occupied by the segregated particles is 5.0% or less and an average of cross-sectional areas of the respective segregated particles is 0.075 um2 or less in a cross-section obtained by cutting the dielectric ceramic composition.

Description

technical field [0001] The present invention relates to a dielectric ceramic composition and a ceramic electronic component having a dielectric layer composed of the dielectric ceramic composition. Background technique [0002] Multilayer ceramic capacitors, which are one example of ceramic electronic components, are widely used as small, high-performance, and highly reliable electronic components, and are often mounted on multilayer ceramic capacitors as electronic components for automobiles. [0003] Multilayer ceramic capacitors for automobiles need to be compact and high performance, of course, and must also have high reliability in high temperature and high voltage environments. In recent years, multilayer ceramic capacitors have been required to ensure performance and improve reliability in a high-temperature environment of 125 to 150° C. and at 16 V to 100 V. [0004] Patent Document 1 describes a multilayer ceramic capacitor that satisfies X8R characteristics and ha...

Claims

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Application Information

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IPC IPC(8): C04B35/468H01B3/12H01G4/12
CPCH01G4/1227C04B35/4682C04B35/488C04B35/49C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3225C04B2235/3236C04B2235/3239C04B2235/3249C04B2235/3262C04B2235/3418C04B2235/5454C04B2235/6025C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6584C04B2235/6588C04B2235/768C04B2235/79C04B2235/80C04B2237/346C04B2237/68H01G4/30H01B3/12
Inventor 兼子俊彦藤野辰哉森崎信人伊藤康裕
Owner TDK CORPARATION
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