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Dielectric porcelain and laminated ceramic capacitor

A dielectric and porcelain technology, applied in the field of laminated ceramic capacitors, can solve the problems of reduced insulation resistance, large reduction in insulation resistance, and difficulty in meeting the life characteristics of high temperature load tests, and achieves reduced dielectric loss, high insulation, and life characteristics. superior effect

Active Publication Date: 2010-03-03
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, as shown in the above-mentioned Patent Documents 1 and 2, the crystal grains constituting the dielectric layer have a core-shell structure. When the applied voltage is low, high insulation resistance is obtained. However, when the applied voltage is increased, The problem of a large decrease in insulation resistance
[0010] In addition, as shown in the above-mentioned Patent Documents 1 and 2, in a multilayer ceramic capacitor including a dielectric ceramic having a core-shell structure as a dielectric layer, the insulation resistance of the dielectric ceramic decreases, resulting in a When the dielectric layer is thinned, it is difficult to satisfy the life characteristics in the high temperature load test

Method used

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  • Dielectric porcelain and laminated ceramic capacitor
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  • Dielectric porcelain and laminated ceramic capacitor

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no. 1 approach

[0026] figure 1 It is an enlarged view of the dielectric ceramic of this embodiment, and is a schematic diagram showing crystal grains and grain boundary phases. The dielectric ceramic of this embodiment has: crystal grains 1 mainly composed of barium titanate; and grain boundary phases 2 existing between the crystal grains 1, and the crystal grains 1 contain vanadium. Most of the vanadium is dissolved in the crystal grain 1, and the content of vanadium in the dielectric ceramic is relative to 1 mole of barium constituting barium titanate, according to V 2 o 5 When converted, it is 0.0005 to 0.03 mol. In addition, in the X-ray diffraction pattern of dielectric ceramics, the diffraction intensity of the (004) plane representing the cubic system of barium titanate is greater than the diffraction intensity of the (400) plane representing the cubic system of barium titanate.

[0027] By setting the dielectric ceramics to the above-mentioned composition and making the crystal st...

no. 2 approach

[0059] In the dielectric ceramic of this embodiment, with respect to 1 mole of barium constituting the barium titanate, V 2 o 5 Contains 0.0005 to 0.003 moles of magnesium in conversion, 0 to 0.001 moles of magnesium in conversion to MgO, and 0 to 0.005 moles of manganese in conversion to MnO, according to RE 2 o 3 In conversion, 0.004 to 0.015 mol of a rare earth element (RE) selected from the group consisting of yttrium, dysprosium, holmium, and erbium is contained. In addition, in the X-ray diffraction pattern of dielectric ceramics, the diffraction intensity of the (004) plane representing the tetragonal barium titanate is greater than the diffraction intensity of the (004) plane representing the cubic barium titanate. Therefore, it can be obtained that the relative permittivity can be made to be 2800 or more, and the temperature change of the relative permittivity satisfies the X7R characteristic of the EIA standard. Furthermore, the value of the DC voltage applied per ...

Embodiment I

[0100] Dielectric ceramics were fabricated as follows. First, prepare BaCO with a purity of 99.9% 3 Powder, TiO 2 Powder, V 2 o 5 powder, MgO powder, Y 2 o 3 Powder, Dy 2 o 3 Powder, Ho 2 o 3 Powder, Er 2 o 3 Powder, and MnCO 3 Powder, blended according to the ratio shown in Table 1, to prepare mixed powder. The amounts shown in Tables 1 and 2 are amounts corresponding to the oxide-equivalent amounts of the elements.

[0101] Secondly, the mixed powder is quasi-calcined at a temperature of 1000°C, and the powder is quasi-calcined. Then, the mixed powder was granulated, and formed into a sheet shape (pellet shape) having a diameter of 16.5 mm and a thickness of 0.7 mm. The sheets of each composition were fired at 1300° C. in a hydrogen-nitrogen atmosphere. The following evaluations were performed on the produced samples.

[0102] First, use X-ray diffraction (2θ=99° to 102°, Cu-Kα) to identify the grain boundary phase, and then obtain the diffraction intensity (...

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Abstract

To provide a dielectric porcelain, which, even when the voltage applied is low, can realize a high level of insulating resistance and undergoes only a low level of lowering in insulating resistance upon a rise in voltage, and a laminated ceramic capacitor, which is excellent in service life properties in a high-temperature load test, using the dielectric porcelain as a dielectric layer. [MEANS FOR SOLVING PROBLEMS] A dielectric porcelain comprising crystal grains composed mainly of barium titanate and containing vanadium and a grain boundary phase present between the crystal grains, wherein the content of vanadium is 0.0005 to 0.03 mole in terms of V2O5 based on one mole of barium constituting the barium titanate and, in an X-ray diffraction chart for the dielectric porcelain, the diffracted intensity of (004) face showing a tetragonal system of the barium titanate is larger than the diffracted intensity of (400) face showing a cubic system of the barium titanate.

Description

technical field [0001] The present invention relates to a dielectric ceramic made of crystal grains mainly composed of barium titanate, and a laminated ceramic capacitor using this as a dielectric layer. Background technique [0002] In recent years, with the popularization of mobile devices such as mobile phones and the increase in speed and frequency of semiconductor elements that are the main components of computers and the like, multilayer ceramic capacitors mounted on such electronic devices have become smaller and higher in capacitance as power supplies. The requirements of the requirements are gradually increasing, and the dielectric layer constituting the laminated ceramic capacitor is seeking to be thinner and more laminated. [0003] In addition, as dielectric ceramics for dielectric layers constituting multilayer ceramic capacitors, dielectric constant materials containing barium titanate as a main component have been used conventionally. In recent years, oxide p...

Claims

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Application Information

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IPC IPC(8): C04B35/46H01B3/12H01G4/12H01G4/30
CPCC04B2235/3239C04B2235/3206H01G4/30C04B2235/85C04B2235/765C04B2235/79C04B35/4682C04B35/62645H01B3/12C04B2235/762C04B2235/3262H01G4/1227C04B2235/3224C04B2235/3225
Inventor 东勇介山崎洋一
Owner KYOCERA CORP