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Dielectric ceramic composition and multilayer ceramic capacitor

A technology of dielectric ceramics and components, applied in the field of multilayer ceramic capacitors, can solve the problems of unstable operation and insufficient resistivity, and achieve the effects of stable characteristics, high resistivity and high permittivity

Active Publication Date: 2013-08-14
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, KSr of Patent Document 1 2 Nb 5 o 15 The ceramic composition has high permittivity ε but insufficient resistivity ρ
Therefore, operation may be unstable in an environment with high driving voltage

Method used

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  • Dielectric ceramic composition and multilayer ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0036] In this experiment example, the investigation is that, relative to the principal component (KSr 2 Nb 5 o 15 ), changing the element type and content of R and M in the subcomponents, thereby affecting the electrical characteristics. The sample numbers of the prepared samples are 1 to 35, and Table 1 shows the composition of each sample and the measurement results of electrical characteristics. It will be described in detail below.

[0037] First, as the raw material of the main component, prepare K 2CO 3 , SrCO 3 , Nb 2 o 5 , weigh these raw materials to make it a composition formula: KSr 2 Nb 5 o 15 The composition shown is mixed in a solvent with a ball mill and dried, and then synthesized by heat treatment at 1000 ° C for 2 hours, thus obtaining KSr 2 Nb 5 o 15 Composition of the main ingredient powder.

[0038] For example, with respect to 100 mole parts of the main component, the molar parts of R contained in sample numbers 1 to 35 in Table 1, the deta...

experiment example 2

[0049] In this experiment example, the investigation is that, relative to the principal component (KSr 2 Nb 5 o 15 ), in the composition of R and M containing subcomponents, a part of the K site is replaced by Na, which affects the electrical characteristics. The sample numbers of the prepared samples are 101 to 123, and Table 2 shows the composition of each sample and the measurement results of electrical characteristics. It will be described in detail below.

[0050] First, make the composition formula: (K 1-x Na x )Sr 2 Nb 5 o 15 The value of x in Table 2 is the value of x shown in sample numbers 101 to 123 in Table 2, so as the raw material of the main component, weigh K 2 CO 3 、Na 2 CO 3 , SrCO 3 , Nb 2 o 5 , mixed these raw materials with a ball mill in a solvent, dried them, and then carried out 2 hours of heat treatment synthesis at 1000 ° C, thus obtaining (K 1-x Na x )Sr 2 Nb 5 o 15 main ingredient powder.

[0051] For example, with respect to 100...

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Abstract

A dielectric ceramic composition that is used for a monolithic ceramic capacitor, can be cofired with internal electrodes mainly composed of Ni at a temperature of 1200° C. or less, and has a high resistivity is provided. The dielectric ceramic composition is mainly composed of a tungsten bronze type complex oxide having a composition formula of (K1-xNax)Sr2Nb5O15 (wherein 0≦̸x<0.2) and further contains, as accessory components, 0.05 to 20 molar parts of R (wherein R is at least one selected from the group consisting of Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) and 0.05 to 40 molar parts of M (wherein M is at least one selected from the group consisting of Mn, V, Li, Si, Ni, Cr, Co, Fe, Zn, Mg, and Zr) per 100 molar parts of the main component.

Description

technical field [0001] The present invention relates generally to dielectric ceramic compositions and laminated ceramic capacitors, and in particular to KSr with tungsten bronze (tungsten bronze) type structure 2 Nb 5 o 15 A dielectric ceramic composition as a basic component, and a multilayer ceramic capacitor using the dielectric ceramic composition. Background technique [0002] A multilayer ceramic capacitor, which is the main application of the present invention, is generally manufactured as follows. [0003] First, a ceramic substrate containing a dielectric ceramic raw material is prepared, and a conductive material constituting internal electrodes is applied to the surface in a desired pattern. [0004] Next, a plurality of ceramic substrates containing the ceramic substrates added with the above-mentioned conductive material are stacked and bonded by thermocompression, whereby an integrated green layered body is produced. [0005] Next, this green layered body i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/00H01B3/12H01G4/12H01G4/30
CPCC04B2235/3239C04B2235/768H01B3/12C04B2235/3206H01G4/30C04B2235/3201C04B2235/6582C04B2235/3213C04B35/495C04B2235/3279C04B2235/6584C04B2235/3203C04B35/62685C04B2235/3262C04B2235/3272C04B2235/3224C04B2235/652C04B2235/3418H01G4/1254C04B2235/3284C04B2235/3251C04B2235/3227C04B2235/6588C04B2235/3241C04B2235/3255C04B2235/3225C04B2235/3275C04B2235/3244C04B35/00H01G4/12
Inventor 竹田敏和
Owner MURATA MFG CO LTD
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