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Dielectric porcelain and capacitor

A porcelain body and dielectric technology, applied in capacitors, laminated capacitors, fixed capacitors, etc., can solve the problem of large temperature change rate of specific permittivity and achieve the effect of improving specific permittivity

Active Publication Date: 2009-07-08
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the high-permittivity dielectric ceramics mainly composed of barium titanate disclosed in Patent Documents 1 and 2 and Non-Patent Document 1 are inherently ferroelectric crystals, so they have specific permittivity. The problem of large temperature change rates

Method used

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  • Dielectric porcelain and capacitor
  • Dielectric porcelain and capacitor
  • Dielectric porcelain and capacitor

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Experimental program
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Embodiment

[0054]

[0055] Compared to barium titanate (BaTiO 3 ), adding additives (magnesium, rare earth elements, manganese) in the combinations shown in Table 1 and firing to produce dielectric porcelain bodies (sample Nos. 1 to 30 in Table 1). Specifically, first, with respect to pre-synthesized BaTiO with an average particle diameter of 100 nm (sample No. 2 is 200 nm) 3 The amount of additives shown in Table 1 was added to 1 mole part of barium in the powder to prepare a mixed powder. Then, this mixed powder was calcined at a temperature of 1050° C. for 2 hours to obtain a calcined powder.

[0056] The obtained calcined powder was pulverized to an average particle diameter of 80nm (the average particle diameter of the calcined powder of sample No. 11 was 65nm), and then formed into pellets with a diameter of 12mm and a thickness of 1mm. It should be noted that, for samples Nos. 27 and 28, oxides of rare earth elements were added to the calcined powder containing rare earth elem...

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Abstract

Disclosed is a dielectric porcelain composed of crystal particles mainly containing barium titanate and further containing magnesium and a rare earth element. The dielectric porcelain contains 0.02-0.064 mole of magnesium in terms of MgO and 0.01-0.06 mole of the rare earth element (RE) in terms of RE2O3 per 1 mole of barium constituting the dielectric porcelain. The crystal particles have a cubic crystal structure and an average particle diameter of 100-145 nm. Also disclosed is a capacitor wherein this dielectric porcelain and a conductive layer are laminated.

Description

technical field [0001] The present invention relates to a dielectric porcelain body and a capacitor, in particular to a dielectric porcelain body composed of crystal particles mainly composed of barium titanate and a capacitor using the same. Background technique [0002] Currently, the spread of digital electronic devices such as portable computers and mobile phones is astonishing. In the near future, digital terrestrial broadcasting will start nationwide in Japan. Many LSIs are used in digital electronic equipment, and televisions will be replaced by liquid crystal displays or plasma displays from the conventional Braun tube method. [0003] A capacitor for shunting is installed in a power supply circuit included in such a digital electronic device. For the capacitor used here, as a capacitor that is miniaturized, high-capacitated, and exhibits stable electrostatic capacity (or specific permittivity) temperature characteristics, it is preferable to use a high-permittivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468H01G4/12H01B3/12
CPCC04B2235/5445C04B2235/3206C04B35/4682C04B2235/5454H01G4/30H01B3/12C04B35/645C04B2235/762C04B2235/656C04B2235/3262H01G4/1227C04B2235/3224C04B2235/3225C04B2235/785B82Y30/00
Inventor 神垣耕世福田大辅
Owner KYOCERA CORP