Dielectric ceramic composition, dielectric ceramic press cake and electronic element containing them

A technology of dielectric ceramics and electronic components, which is applied in the field of dielectric ceramic compositions, can solve the problems that cannot be sintered, Ag and Cu cannot be used as internal electrode materials, etc., and achieve the effect of excellent characteristics and excellent radio frequency characteristics

Inactive Publication Date: 2002-11-20
MURATA MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Electrodes composed of Ag or Cu generally have a melting point in the range of about 960-1,100°C, which is significantly lower than the firing temperatures of 1,300°C or higher employed in known firing processes of dielectric ceramic compositions; Therefore, Ag and Cu cannot be used as internal electrode materials
[0011] The above-mentioned ceramic composition disclosed in Japanese Examined Patent Application Publication No. 4-59267 requires a high firing temperature of 1,350° C. or higher; therefore, the composition cannot be sintered with low-resistance metals such as Ag and Cu

Method used

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  • Dielectric ceramic composition, dielectric ceramic press cake and electronic element containing them
  • Dielectric ceramic composition, dielectric ceramic press cake and electronic element containing them
  • Dielectric ceramic composition, dielectric ceramic press cake and electronic element containing them

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Embodiment

[0061] The present invention will now be described in further detail with reference to the following examples.

[0062] 1. Preparation of calcium carbonate (CaCO 3 ), strontium carbonate (SrCO 3 ), titanium dioxide (TiO 2 ), rare earth oxides (La 2 o 3 etc.), magnesium oxide (MgO), zinc oxide (ZnO) and tin oxide (SnO 2 ).

[0063] 2. compound these starting materials to prepare a composition with the following chemical formula:

[0064] (1-x)MeTi a o 1+2a -xLn(Ma 1 / 2 MB 1 / 2 ) b o (3+3b) / 2

[0065] Additionally, CuO or TiO was added to Sample 39 (Table 4), Samples 66-70 (Table 7), Sample 113 (Table 12), Sample 140 (Table 14), and Samples 141-144 (Table 15). 2 Additives, ingredients formulated to contain additives.

[0066] 3. The prepared powder was wet mixed in a ball mill for 16 hours, dehydrated, dried and calcined at 1,100°C-1,300°C for 3 hours. The calcined powder is pulverized in a ball mill until the particle size is less than 1 micron.

[0067] ...

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Abstract

A dielectric ceramic composition suitable for radio frequency applications, comprising a crystalline main component having a perovskite crystal structure, and an auxiliary component. The crystalline main component is represented by the following chemical formula: (1-x)MeTiaO1+2a-xLn(Ma1/2Mb1/2)bO(3+3b)/2 wherein Me is at least one of Ca and Sr; Ln is a rare earth element; Ma is at least one of Mg and Zn; Mb is at least one of Sn and Zr; x represents the mole fraction of Ln(Ma1/2Mb1/2)bO(3+3b)/2 ; and a and b represent the molar ratio, where 0.95≤a≤1.05, 0.9≤b≤1.05 and 0.3≤x≤0.5. The auxiliary components contain B and Si. The composition can be sintered at a temperature of 1,000°C or lower. An electronic component includes a ceramic component of a dielectric ceramic composition, and a conductor placed inside the ceramic component.

Description

technical field [0001] The present invention relates to a dielectric ceramic composition and a dielectric ceramic compact suitable for radio frequency applications, such as dielectric ceramic compacts with high Q values ​​in the radio frequency range such as microwave and millimeter wave ranges, and in particular to a dielectric ceramic compact suitable for radio frequency applications that can be used with A dielectric ceramic composition in which metal electrodes are stacked together and sintered. The invention also relates to electronic components, such as filters and duplexers, comprising a dielectric ceramic composition or a dielectric ceramic compact. Background technique [0002] In recent years, dielectric ceramic compacts obtained by sintering dielectric ceramic compositions have been widely used in radio frequency applications, such as filters for monolithic integrated circuits (MICs), duplexers, dielectric resonators and dielectric matrix. [0003] In order to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/457C04B35/465H01P1/203
CPCC04B35/457C04B35/465H01P1/2039
Inventor 杉本安隆立川勉高木齐
Owner MURATA MFG CO LTD
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