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Dielectric ceramic, process for producing the same, and laminated ceramic capacitor

A kind of dielectric ceramic and manufacturing method, which is applied in the field of laminated ceramic capacitors to achieve the effects of stabilization, temperature characteristics, and high dielectric constant.

Active Publication Date: 2008-08-06
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] That is, there is no example in the prior art that contains a small amount of zirconia relative to the barium titanate-based grains to increase the relative permittivity

Method used

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  • Dielectric ceramic, process for producing the same, and laminated ceramic capacitor
  • Dielectric ceramic, process for producing the same, and laminated ceramic capacitor

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Embodiment

[0078] A multilayer ceramic capacitor is fabricated as shown below. Table 1 shows the types, average particle diameters, additive amounts, and firing temperatures of the raw material powders used. Here, barium titanate (BT powder) and barium-calcium titanate powder (BCT powder) were coated with Mg, Y, and Mn, and materials in which Mg, Y, and Mn were not coated were mixed with the powders. As BCT powder, Ba 0.95 Ca 0.05 TiO 3 .

[0079] The average particle diameters of barium titanate (BT powder) and barium titanate·calcium titanate powder (BCT powder) were set to 0.25 μm. When mixing the BT powder and the BCT powder, the BT powder and the BCT powder were mixed in the same molar amount, and the coating amounts of Mg, Mn, and Y were prepared so that the BT powder and the BCT powder were 100 parts by mass. In addition, BT powder and BCT powder having an A / B side ratio of 1.003 were used. In addition, the particle size of the BT powder and BCT powder used is mainly 0.2-0.4...

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Abstract

In a dielectric ceramic composed of a composite oxide containing main grains (1) mainly composed of Ti and at least one alkaline earth metal element selected from Ca, Sr, and Ba, the main grains ( 1) Metal components containing Mg, Mn, and rare earth elements, and at least one metal component of Mg, Mn, and rare earth elements exists in the main crystal at a higher concentration than inside the main crystal grain (1) On the surface side of the particles, by containing 0.04 to 0.2 parts by mass of Zr in exchange for oxides with respect to 100 parts by mass of the composite oxide, a high dielectric constant can be realized even in micronized barium titanate-based crystal grains. , and can stabilize the temperature characteristics of the relative permittivity.

Description

technical field [0001] The present invention relates to a dielectric ceramic, a method for producing the same, and a multilayer ceramic capacitor, and more particularly, to a dielectric ceramic exhibiting a high dielectric constant even when granulated, a method for producing the same, and a multilayer ceramic capacitor composed of the dielectric ceramic. 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, which are the main components of personal computers, etc., the demand for miniaturization and increase in capacity of multilayer ceramic capacitors mounted on such electronic devices has increased. come higher. [0003] Therefore, thinning and high lamination of the dielectric layer constituting the multilayer ceramic capacitor are realized. For this reason, the crystal grains constituting the dielectric layer are also required to have a high relati...

Claims

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Application Information

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IPC IPC(8): C04B35/46H01B3/12H01G4/12H01G4/30
CPCC04B35/4682C04B35/62805C04B35/6281C04B35/62815C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3225C04B2235/3232C04B2235/3236C04B2235/3244C04B2235/3262C04B2235/36C04B2235/5445C04B2235/6025C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6582C04B2235/663C04B2235/785C04B2235/79C04B2235/85H01G4/1227H01G4/30C04B35/46H01B3/12H01G4/12
Inventor 福田大辅
Owner KYOCERA CORP
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