Non-reduced dielectric ceramics and ceramic electronic element using the same

A technology of ceramic electronic components and dielectric ceramics, which is applied in the direction of electrical components, fixed capacitor parts, ceramics, etc., can solve the problems of insulation resistance and dielectric loss performance deterioration, becoming semi-conductive, application restrictions of ceramic electronic components, etc. , to achieve the effects of insulation resistance and dielectric loss deterioration, reliability enhancement, and excellent temperature stability

Inactive Publication Date: 2002-08-21
MURATA MFG CO LTD
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Problems solved by technology

[0007] In addition, if the tungsten bronze type crystal phase is burned in a neutral or reducing atmosphere, because of its poor non-reducing performance, it will become semi-conductive, resulting in deterioration of insulation resistance and dielectric loss performance
[0008] In addition, since the capacitance of the tungsten bronze crystal phase varies with temperature at a rate of up to about -100ppm / °C, the application of ceramic electronic components containing this crystal phase is limited.

Method used

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  • Non-reduced dielectric ceramics and ceramic electronic element using the same
  • Non-reduced dielectric ceramics and ceramic electronic element using the same
  • Non-reduced dielectric ceramics and ceramic electronic element using the same

Examples

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example 1

[0051] Experiments were performed to determine the ratio of tungsten bronze and pyrochlore-type crystal phases contained in non-reducing dielectric ceramics.

[0052] First, prepare TiO 2 and RE 2 o 3 powder as raw material. Rare earth elements as shown in Table 1 were used. A predetermined amount of the above-mentioned raw material powders is weighed, wet-mixed using a ball mill, and then dried. Then calcined in air at 900-1000°C for 2 hours to obtain 2 Ti 2 o 7 Crystalline powder.

[0053] Except with RE 2 Ti 2 o 7 In addition to the powder of the crystalline phase, BaCO is also prepared 3 、TiO 2 , MnCO 3 , CuO and V 2 o 5 powder. These powders were weighed to meet the composition shown in Table 1, wet mixed using a ball mill, and dried. Calcining in air at 900-1100° C. for 2 hours to obtain calcined powder.

[0054] The preparation composition is 10Li 2 O-20SiO 2 -20B 2 o 3 - 50BaO (% by weight) glass powder. The glass powder was added to 100 parts by...

example 2

[0080] In Example 2, samples were prepared to examine the influence of the contents of Mn, glass components, Cu and V as minor components.

[0081] table 3

[0082] Table 3 also shows Sample 19 prepared in Example 1.

[0083] Table 4

[0084] Tables 3 and 4 show that even in the 3 -bTiO 2 -cRE 2 Ti 2 o 7 A minor component is added to the main component, wherein the minor component is about 3-35 moles of MnCO relative to 100 moles of Ti in the main component 3 , about 3-25 parts by weight of the glass component relative to 100 parts by weight of the main component, about 0-25 moles of CuO relative to 100 moles of Ti in the main component, about 0-25 moles relative to 100 moles of Ti in the main component VO 5 / 2 , It can also be burned at 980-1020°C in a reducing atmosphere. Resistivity up to 1.0×10 9 Ω·m, and, although not shown in Table 4, the Q factor at 1 MHz is also as high as 1000, or higher. The rate of change of capacitance with temperature...

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Abstract

A nonreducing dielectric ceramic contains a tungsten-bronze-type crystal phase including at least Ba, RE and Ti as elements, and a pyrochlore-type crystal phase including at least RE and Ti as elements, where RE is at least one rare-earth element. The relationship 0.10<=b / (a+b)<=0.90 is satisfied, where a is the maximum peak intensity assigned to the tungsten-bronze-type crystal phase and b is the maximum peak intensity assigned to the pyrochlore-type crystal phase determined by X-ray diffractometry. A ceramic electronic component includes an electronic component body composed of the nonreducing dielectric ceramic and a conductor in contact with the nonreducing dielectric ceramic.

Description

technical field [0001] The present invention relates to non-reducing dielectric ceramics and ceramic electronic components using the same, such as monolithic ceramic capacitors and monolithic LC filters using such non-reducing dielectric ceramics. In particular, the present invention relates to an improvement in non-reducing dielectric ceramics for cofiring with copper or copper alloys. Background technique [0002] In Japanese Examined Patent Application Publication Zhao 55-20602, etc., a tungsten bronze-type crystal phase is disclosed, such as BaRE 2 Ti 4 o 12 type crystal phase and BaRE 2 Ti 5 o 14 Type crystal phase dielectric ceramics, where RE is a rare earth metal element, it is used in ceramic electronic components, such as temperature compensation type ceramic capacitors. Because of their small dielectric loss (high Q factor), they are suitable for ceramic electronic components, and because of the high relative permittivity ε of 70-80, they can miniaturize cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/462C04B35/468H01B3/12H01G4/12H01G4/40
CPCH01G4/129H01G4/40C04B35/468C04B35/462H01G4/1227C04B35/4682H01G4/12
Inventor 内藤正浩
Owner MURATA MFG CO LTD
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