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Dielectric ceramic and capacitor

A dielectric and capacitor technology, which is applied in the direction of fixed capacitor dielectric, fixed capacitor parts, ceramics, etc., can solve the problems of inability to meet the performance of bypass capacitors, low storage capacity, and low relative dielectric constant of dielectric ceramics, etc. problem, to achieve the effect of small temperature change rate, suppression of noise generation, and reduction of spontaneous polarization

Inactive Publication Date: 2012-11-21
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although it has the advantage of not causing the inductive strain peculiar to ferroelectricity, the relative permittivity of dielectric ceramics is low, so the power storage capacity is low, resulting in a problem that the performance as a bypass capacitor cannot be satisfied.

Method used

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  • Dielectric ceramic and capacitor
  • Dielectric ceramic and capacitor
  • Dielectric ceramic and capacitor

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no. 1 approach

[0033] Hereinafter, the dielectric ceramic and the capacitor according to the first embodiment of the present invention will be described in detail with reference to the drawings. figure 1 is a schematic cross-sectional view showing the capacitor of this embodiment. The dielectric ceramic of this embodiment is mainly composed of barium titanate, which contains magnesium, yttrium, manganese, and niobium. The content thereof contains 0.01 to 0.06 moles of magnesium in terms of MgO relative to 1 mole of barium. 2 o 3 In terms of conversion, 0.0007 to 0.03 moles of yttrium are contained, and in terms of MnO conversion, 0.0002 to 0.03 moles of manganese are contained, and Nb 2 o 5 In conversion, 4.2 to 33.3 parts by mass of niobium are contained.

[0034] In addition, the dielectric ceramic of this embodiment is composed of crystal grains mainly composed of barium titanate and grain boundary phases formed between the crystal grains. The grain boundary phase is an amorphous phas...

no. 2 approach

[0065] Next, a second embodiment of the present invention will be described. The dielectric ceramic of the present embodiment contains barium titanate as the main component, and contains magnesium, yttrium, manganese, niobium, silicon and boron, and its content is 0.01 to 0.01 to 100 mg of magnesium in terms of MgO relative to 1 mole of barium. 0.06 mol to Y 2 o 3 In terms of conversion, 0.0007 to 0.03 moles of yttrium are contained, and in terms of MnO conversion, 0.0002 to 0.03 moles of manganese are contained, and Nb 2 o 5 In terms of conversion, it contains 4.2 to 33.3 parts by mass of niobium, expressed as SiO 2 In terms of conversion, it contains 0.73 to 6.3 parts by mass of silicon, expressed as B 2 o 3 In conversion, 0.31 to 2.1 parts by mass of boron is contained.

[0066] In addition, the dielectric ceramic according to this embodiment includes crystal grains mainly composed of barium titanate and grain boundary phases formed between the crystal grains, and the...

no. 3 approach

[0091] Next, a third embodiment of the present invention will be described. The dielectric ceramic of the present embodiment contains barium titanate as the main component, and contains magnesium, yttrium, manganese, niobium, silicon, and lithium, and the content thereof contains 0.01 to 0.01 to 1,000 mg of magnesium in terms of MgO relative to 1 mole of barium. 0.06 mol to Y 2 o 3 In terms of conversion, 0.0007 to 0.03 moles of yttrium are contained, and in terms of MnO conversion, 0.0002 to 0.03 moles of manganese are contained, and Nb 2 o 5 In terms of conversion, it contains 4.2 to 33.3 parts by mass of niobium, expressed as SiO 2 In terms of conversion, it contains 0.73 to 6.3 parts by mass of silicon, and Li 2 In terms of O, 0.31 to 2.1 parts by mass of lithium is contained.

[0092] In addition, the dielectric ceramic according to this embodiment includes crystal grains mainly composed of barium titanate and grain boundary phases formed between the crystal grains, ...

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Abstract

Disclosed is a dielectric ceramic comprising crystal grains mainly composed of barium titanate. This dielectric ceramic contains 0.01-0.06 mole of magnesium in terms of MgO, 0.0007-0.03 mole of yttrium in terms of Y2O3 and 0.0002-0.03 mole of manganese in terms of MnO per 1 mole of barium constituting the barium titanate, while containing 4.2-33.3 parts by mass of niobium in terms of Nb2O5 per 100 parts by mass of the barium titanate. The crystal grains have an average particle size of 0.05-0.25 [mu]m. Also disclosed is a capacitor composed of a laminate having a conductive layer and a dielectric layer made of such a dielectric ceramic.

Description

technical field [0001] The present invention relates to a dielectric ceramic composed of crystal grains mainly composed of barium titanate, and a capacitor using the same for a dielectric layer. Background technique [0002] At present, digital electronic devices such as portable computers and mobile phones are attracting people's attention, and terrestrial digital broadcasting will be launched in the near future. As receivers for terrestrial digital broadcasting, that is, digital electronic equipment, there are liquid crystal displays, plasma displays, and the like, and many LSIs are used in these digital electronic equipment. [0003] Therefore, a large number of bypass capacitors are mounted in power supply circuits constituting digital electronic devices such as liquid crystal displays and plasma displays. As the capacitor used here, when a high capacitance is required, a multilayer ceramic capacitor with a high dielectric constant is used (for example, refer to Patent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G4/12H01B3/12C04B35/46
Inventor 山口胜义久木亮太三野裕章
Owner KYOCERA CORP
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