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

一种六方晶系、钛酸钡的技术，应用在固定电容器电介质、固定电容的零部件、陶瓷等方向，能够解决应用不充分等问题，达到充分可靠性、高相对介电常数、确保可靠性的效果

Inactive Publication Date: 2011-05-18
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 sufficient for application to dielectric layers of electronic components that are being thinned.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment

[0114] Hereinafter, the present invention will be further described based on detailed examples, but the present invention is not limited to these examples. In addition, in the following examples and comparative examples, "relative permittivity ε", "insulation resistance" and "dielectric loss tanδ" were measured as follows.

[0115]

[0116] For capacitor samples, at a reference temperature of 20°C, use a digital LCR detector (YHP4274A manufactured by Yokogawa Electric Co., Ltd.) to measure at a frequency of 1 kHz and an input signal level (measurement voltage) of 0.5 Vrms / μm. Electrostatic capacity C. The relative permittivity (unitless) was calculated from the obtained capacitance, the dielectric thickness of the multilayer ceramic capacitor, and the overlapping area between the internal electrodes.

[0117] Then, the insulation resistance IR after DC50V was applied to the capacitor sample at 25° C. for 60 seconds was measured using an insulation resistance meter (R8340A m...

experiment example 1

[0120]

[0121] 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 the raw material of Mn, prepare Mn 3 o 4 (specific surface area: 20m 2 / g).

[0122] Weigh these raw materials, so that the general formula (Ba 1-α m α ) A (Ti 1-β mn 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 produce hexagonal barium titanate powder.

[0123] The heat treatment conditions were as follows: the heating rate was 200° C. / hour, the holding temperature was the temperature shown in Table 1, the temperature holding time was 2 hours, the cooling rate was 200° C. / hour, and the atmosphere gas was air.

[0124] The obtained hexagon...

experiment example 2

[0141] Except that the ratio (α / β) of the A-site substitution amount α to the B-site substitution amount β was the value shown in Table 4, powder was produced in the same manner as in Experimental Example 1, and the specific surface area and X-ray diffraction were measured. The results are shown in Tables 4-6.

[0142]

[0143]

[0144]

[0145] It can be confirmed from Tables 4 to 6 that when the ratio (α / β) of the amount of substitution at the A site to the amount of substitution at the B site is changed, if the α / β is too large, it may be difficult to obtain a specific surface area of ​​2 m 2 / g or more hexagonal barium titanate powder.

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Abstract

The invention relates to a hexagonal type barium titanate power, a producing method thereof, a dielectric ceramic composition and an electronic component. Dielectric ceramic composition includes a hexagonal type barium titanate as a main component shown by a generic formula (Bai-[alpha]M[alpha])A(Ti1-[beta]Mn[beta])BO3 and having hexagonal structure wherein an effective ionic radius of 12-coordinated 'M' is -20% or more to +20% or less with respect to an effective ionic radius of 12-coordinated Ba2+ and the A, B, [alpha] and [beta] satisfy relations of 0.900<=(A / B)<=1.040, 0.003<=[alpha]<=0.05, 0.03<=[beta]<=0.2, and as subcomponents, with respect to the main component, certain contents of alkaline earth oxide such as MgO and the like, Mn3O4 and / or Cr2O3, CuO, Al2O3, rare earth element oxide and glass component including SiO2. According to the present invention, it can be provided the hexagonal type barium titanate powder and dielectric ceramic composition which are preferable for producing electronic components such as a capacitor and the like showing high specific permittivity, having advantageous insulation property and sufficient reliability.

Description

technical field [0001] The present invention relates to hexagonal barium titanate powder, a method for producing the same, and a dielectric ceramic composition containing the hexagonal barium titanate as a main component. Relative permittivity) while ensuring sufficient reliability of the dielectric ceramic composition of the dielectric layer of electronic parts such as ceramic capacitors. In addition, the present invention relates to an electronic component having a dielectric layer comprising the dielectric ceramic composition. Background technique [0002] In recent years, the miniaturization and high performance of electrical and electronic equipment have rapidly progressed. For electronic components used in such equipment, it is also required to ensure sufficient reliability and simultaneously improve various characteristics (relative permittivity, temperature characteristics, etc.) Wait). This is no exception for a ceramic capacitor as an example of an electronic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/626H01B3/12H01G4/12
CPCC04B2235/767C04B2235/3206C04B2235/6584C04B2235/3225C04B2235/6562C04B2235/6588C04B35/62675C04B2235/5409C04B2235/3217C01P2006/12C04B2235/3418C04B2235/3215C01P2006/40C04B2235/80C01P2004/53C04B2235/662C04B2235/3208C04B2235/3281C04B2235/365C04B2235/79C01P2004/52C01P2002/76C04B2235/3229C01P2002/52C04B2235/3298C04B2235/6565C04B2235/785C01G23/006C04B2235/6567C04B2235/3227C01P2002/72C04B2235/81C01P2004/51C04B35/468C04B2235/3224C04B2235/3241C04B2235/3263C01G45/125
Inventor 石井辰也夏井秀定塚田岳夫依田真一余野建定
Owner TDK CORPARATION
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