Hexagonal type barium titanate powder, producing method thereof, dielectric ceramic composition, electronic component, and producing method of electronic component

A hexagonal, barium titanate technology, applied in the direction of titanium compounds, ceramics, titanates, etc., can solve the problems of insufficient dielectric layers for electronic components, and achieve full reliability, high relative permittivity, insulation, etc. Excellent resistance

Inactive Publication Date: 2012-05-09
TDK CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the specific surface area of ​​the hexagonal barium titanate obtained in Non-Patent Document 1 is 1.6 m 2 / g, even if this hexagonal barium titanate powder is used, it is not enough to be used in the dielectric layer of electronic components that are becoming thinner.

Method used

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  • Hexagonal type barium titanate powder, producing method thereof, dielectric ceramic composition, electronic component, and producing method of electronic component
  • Hexagonal type barium titanate powder, producing method thereof, dielectric ceramic composition, electronic component, and producing method of electronic component
  • Hexagonal type barium titanate powder, producing method thereof, dielectric ceramic composition, electronic component, and producing method of electronic component

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Effect test

experiment example 1

[0117]

[0118] First, as a raw material of barium titanate, BaCO 3 (specific surface area: 25m 2 / g) and TiO 2 (specific surface area: 50m 2 / g). In addition, as a raw material of the element M, La(OH) 3 (specific surface area: 10m 2 / g), as a raw material for Ga, prepare Ga 2 o 3 (specific surface area: 15m 2 / g).

[0119] Weigh these raw materials, so that the general formula (Ba 1-α m α ) A (Ti 1-β Ga β ) B o 3 α, β, and A / B in are the values ​​shown in Table 1, respectively, and water and a dispersant were mixed together using a ball mill. The obtained mixed powder was treated under the following heat treatment conditions to prepare hexagonal barium titanate powder.

[0120] Heat treatment conditions are: heating rate: 200°C / hour, holding temperature: the temperature shown in Table 1, temperature holding time: 2 hours, cooling rate: 200°C / hour, atmospheric gas: reduction of nitrogen+hydrogen (3% by volume) sex atmosphere.

[0121] The obtained hexagona...

experiment example 2

[0142] In addition to using the oxides, carbonates, and hydroxides of the elements shown in Table 4 instead of La(OH) 3 Except for the raw material of element M, powder was produced in the same manner as in Experimental Example 1, and the specific surface area and X-ray diffraction measurement were performed. The results are shown in Tables 4-6.

[0143] Table 4

[0144]

[0145] "Miscible phase" means that there are more than 2 phases in h-BT, t-BT, c-BT, barium orthotitanate / barium digallium compound

[0146] table 5

[0147]

[0148] Table 6

[0149]

[0150] From the above, it can be confirmed that the hexagonal barium titanate powder of the present invention contains hexagonal barium titanate as a main component and has a specific surface area of ​​2 m 2 / g or more, the particle size distribution is narrow.

experiment example 3

[0152]Dielectric powders (samples 1, 2, 5, 8 to 11, 14, 15, 17, 18, 25-34). To these dielectric powder samples: 100% by mass, polyvinyl alcohol aqueous solution: 10% by mass was added, followed by granulation and sieving. Then, the obtained granulated powder was molded under a pressure of 30 Pa to obtain a disk-shaped green body with a diameter of 12 mm and a thickness of about 1 mm.

[0153] Next, the obtained formed body was fired in an atmosphere of nitrogen + hydrogen (3% by volume) at 1300° C. for 2 hours to obtain a disk-shaped sintered body. Then, an indium gallium electrode was applied to the main surface of the obtained sintered body, followed by firing treatment to obtain a disc-shaped ceramic capacitor sample. The thickness of the dielectric layer 10 of the obtained capacitor sample was about 0.6 mm. Then, for each of the obtained capacitor samples (samples 1a, 2a, 5a, 8a to 11a, 14a, 15a, 17a, 18a, 25a to 34a), the "relative permittivity ε", "insulation resistan...

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Abstract

The present invention relates to a HEXAGONAL TYPE BARIUM TITANATE POWDER, a PRODUCING METHOD THEREOF, a DIELECTRIC CERAMIC COMPOSITION, an ELECTRONIC COMPONENT, AND a PRODUCING METHOD OF the ELECTRONIC COMPONENT, wherein the hexagonal type barium titanate powder comprising barium titanate as a main component shown by a generic formula of (Ba1-[alpha]M[alpha])A(Ti1-[beta]Ga[beta])BO3 and having hexagonal structure wherein; an effective ionic radius of 12-coordinated ''M'' is -25% or more to +25% or less with respect to an effective ionic radius of 12-coordinated Ba2+, and said A, B, [alpha] and [beta] satisfy relations of 0.975<=(A / B)<=1.015, 0.0015<=[alpha]<0.005, 0.075<=[beta]<=0.15.

Description

technical field [0001] The present invention relates to a hexagonal barium titanate powder, its production method, dielectric ceramic composition, electronic components and the production method of the electronic components. Background technique [0002] In recent years, the miniaturization and high performance of electronic equipment and electronic equipment have been rapidly developed. For electronic components used in such equipment, it is also required to ensure sufficient reliability and improve various characteristics (relative permittivity (specific permittivity) at the same time. ), temperature characteristics, etc.). This is no exception to a ceramic capacitor as an example of an electronic component. [0003] As a dielectric material for such a capacitor, especially a dielectric material having a high relative permittivity, tetragonal barium titanate mainly composed of tetragonal barium titanate and partly containing cubic crystals can be used. However, in recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/626C04B35/622
CPCC01P2006/12C04B2235/767C01P2002/72C04B2235/3232C04B35/468C04B2235/3215C04B2235/3224C01P2004/52C01P2004/62C01G23/003C04B2235/3286C01G23/00C04B35/653H01B3/12
Inventor 日高重和石井辰也塚田岳夫夏井秀定增田健一郎
Owner TDK CORP
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