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Dielectric ceramic composition, dielectric ceramic and laminated ceramic part including the same

A technology of dielectric ceramics and composition, applied in the field of dielectric ceramics, can solve the problem of insufficient high-frequency dielectric ceramics in resonators

Inactive Publication Date: 2007-03-28
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Q value of the resonator is insufficient for high frequency dielectric ceramics
Also, there is no information about the resonant frequency f in the above publication 0 The temperature coefficient τ f records

Method used

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  • Dielectric ceramic composition, dielectric ceramic and laminated ceramic part including the same
  • Dielectric ceramic composition, dielectric ceramic and laminated ceramic part including the same
  • Dielectric ceramic composition, dielectric ceramic and laminated ceramic part including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] ZnO and Al 2 o 3 The powders were weighed separately so that the molar ratio was 1:1. The weighed powder is mixed with ethanol (solvent, the same in the description below) and ZrO 2 The balls were added together to a ball mill and wet mixed for 24 hours. After removing the solvent from the solution, the resulting mixture was dried and calcined at 1000 °C in an air atmosphere for 2 hours to obtain ZnAl 2 o 4 powder.

[0096] Similarly, ZnO and SiO 2 The powders were weighed so that the molar ratio was 2:1. Weighed powder with ethanol and ZrO 2 The balls were added together to a ball mill and wet mixed for 24 hours. After removing the solvent from the solution, the resulting mixture was dried and calcined at 1000 °C in an air atmosphere for 2 hours to obtain Zn 2 SiO 4 powder.

[0097] Subsequently, the resulting ZnAl 2 o 4 and Zn 2 SiO 4 Powder and TiO 2 The powders were weighed in amounts of 7.5 mol%, 67.5 mol% and 25 mol%, respectively. The weighed pow...

Embodiment 2-10

[0103] In the same method as in Example 1, weigh ZnAl respectively with the composition ratio shown in Table 1 2 o 4 and Zn 2 SiO 4 Powder, TiO 2 powder and glass powder. The weighed powders were mixed and shaped under the same conditions as in Example 1. The obtained particles were sintered at 900-925° C. for 2 hours in an air atmosphere, thereby obtaining a dielectric ceramic and a resonator. The obtained dielectric ceramics and resonators were evaluated for various characteristics in the same manner as in Example 1. The results are shown in Table 2. FIG. 3 shows an X-ray diffraction pattern of the dielectric ceramic obtained in Example 2. FIG.

Embodiment 11

[0107] ZnO and TiO 2 The powders were weighed separately so that their molar ratio was 2:1. Weighed powder with ethanol and ZrO 2 The balls were added together to a ball mill and wet mixed for 24 hours. After removing the solvent from the solution, the resulting mixture was dried and calcined at 1000 °C in an air atmosphere for 2 hours to obtain Zn 2 TiO 4 Crystalline powder.

[0108] Then in the same manner as the examples, ZnAl was obtained 2 o 4 and Zn2 SiO 4 powder.

[0109] The resulting ZnAl 2 o 4 Powder, Zn 2 SiO 4 Powder and Zn 2 TiO 4 powder, and TiO 2 The powder and glass frit were weighed at the composition ratios stated in Table 1, respectively. The weighed powders were mixed and shaped under the same conditions as in Example 1. The resulting particles were sintered at 875°C for 2 hours in an air atmosphere, whereby a dielectric ceramic and a resonator were obtained. The obtained dielectric ceramics and resonators were evaluated for various charact...

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Abstract

A dielectric ceramic composition which can be formed into a built-in or multilayer structure through simultaneously firing with a low resistance conductor such as Ag or Cu and can be fired at 800 to 1000 DEG C into a dielectric ceramic exhibiting a dielectric constant ([epsilon]r) of 10 or below, a large Qxf0 value and an absolute value of temperature coefficient (tauf) of resonance frequency (f0) of 20 ppm / DEG C or less whose regulation is easy. The dielectric ceramic composition comprises 5 to 150 pts.wt. of glass component per 100 pts.wt. of main components of the general formula: aZnAl2O4-bZn2SiO4-cTiO2-dZn2TiO4 wherein the molar fractions a, b, c and d of individual components satisfy the relationships: 5.0 <= a <= 80.0 mol%, 5.0 <= b <= 70.0 mol%,5.0 <= c <= 27.5 mol% and 0 <= d <= 30.0 mol% (provided that a + b + c + d = 100 mol%).

Description

technical field [0001] The present invention relates to dielectric ceramic compositions having a dielectric constant ε not exceeding 10 r , has a large Q value (Q value) in the high frequency region such as microwave or millimeter wave, and the resonance frequency f 0 The temperature coefficient τ f The absolute value of is small, and can be sintered together with metals such as low-resistance conductor silver, copper; The present invention also relates to the dielectric ceramic obtained by sintering the dielectric ceramic composition; Dielectric resonators, laminated dielectric filters and laminated dielectric substrates. Background technique [0002] In recent years, with the rapid development of communication networks, frequency bands used for communication have been expanded to cover high frequency regions such as microwave regions or millimeter wave regions. For dielectric ceramic compositions for high frequencies, a dielectric resonator using a dielectric ceramic ob...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/16H01B3/12
Inventor 石飞信一福田晃一河野孝史射场久善
Owner UBE IND LTD
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