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，应用在钛化合物、钛酸酯、电气元件等方向，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、绝缘电阻优异的效果

Inactive Publication Date: 2011-05-11
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0114] Hereinafter, the present invention will be described based on further 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 "Q value" were measured as follows.

[0115]

[0116] For capacitor samples, static electricity was measured at a reference temperature of 20°C using a digital LCR detector (YHP4274A manufactured by Yokogawa Electric Co., Ltd.) at a frequency of 1 MHz and an input signal level (measurement voltage) of 1 Vrms / μm. 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 manufact...

experiment example 1

[0121]

[0122] 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 Mn, Mn 3 o 4 (specific surface area: 20m 2 / g), as the raw material of element M, La(OH) was prepared 3 (specific surface area: 10m 2 / g).

[0123] 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.

[0124] The heat treatment conditions are: the heating rate is 200°C / hour, the holding temperature is the temperature shown in Table 1, the temperature holding time is 2 hours, the cooling rate is 200°C / hour, and the atmosphere gas is air.

[0125] The obtained hexagonal barium titanate p...

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 A powder was produced in the same manner as in Example 2 except that the raw material of the element M was used, and the specific surface area and X-ray diffraction were measured. The results are shown in Tables 4-6.

[0143]

[0144]

[0145]

[0146] From Tables 4 to 6, it was confirmed that even when an element other than La was used as the element M, there was a tendency similar to that of Example 2.

[0147] 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.

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Abstract

Dielectric ceramic composition includes a hexagonal type barium titanate as a main component shown by a generic formula of (Ba1-[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 1.000<(A / B)<=1.040, 0<=[alpha]<0.003, 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, and CuO and Al2O3 and 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 the dielectric ceramic composition which are preferable for producing electronic components such as a capacitor and the like showing comparatively high specific permittivity, having advantageous insulation property and having 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. A dielectric ceramic composition for a dielectric layer. In addition, the present invention relates to an electronic component having a dielectric layer comprising the dielectric ceramic composition. Background technique [0002] A ceramic capacitor as an example of an electronic component can be used for temperature compensation purposes. For capacitors used in such applications, small changes in characteristics such as relative permittivity over a wide temperature range are required. [0003] The dielectric material of this capacitor can be used, for example, with (Ca)(Ti, Zr)O 3 Paraelectrics (perioelectrics) such as those used as substrate materials (refer to Japanese Patent No. 4325900). However, since a paraelectric is used as a matrix, a high die...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C04B35/468
CPCC01G23/006C01G45/125C01P2002/52C01P2002/72C01P2004/54C01P2004/61C01P2004/62C01P2006/12C01P2006/40C01P2006/42C04B35/4682C04B35/6262C04B35/62675C04B35/638C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3236C04B2235/3241C04B2235/3262C04B2235/3263C04B2235/3281C04B2235/3298C04B2235/36C04B2235/365C04B2235/5409C04B2235/5436C04B2235/5445C04B2235/5481C04B2235/6025C04B2235/6562C04B2235/6565C04B2235/6582C04B2235/6584C04B2235/6588C04B2235/663C04B2235/767C04B2235/79H01G4/1227H01G4/30
Inventor 夏井秀定石井辰也塚田岳夫
Owner TDK CORPARATION
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