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Li-Si-O-based high dielectric constant ceramic materials and method for synthesizing same

A high dielectric constant, ceramic material technology, applied in ceramics, fixed capacitor dielectrics, fixed capacitor components and other directions, can solve the problem of high loss and other problems, and achieve the effect of reducing energy consumption, reducing sintering temperature, and shortening reaction time

Inactive Publication Date: 2005-01-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the study found that although this dielectric material has a very high dielectric constant, its loss is also high

Method used

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  • Li-Si-O-based high dielectric constant ceramic materials and method for synthesizing same
  • Li-Si-O-based high dielectric constant ceramic materials and method for synthesizing same
  • Li-Si-O-based high dielectric constant ceramic materials and method for synthesizing same

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Embodiment 1

[0027] Weigh 0.005mol LiNO 3 , 0.965mol Ni(NO 3 ) 2 Dissolve in 500ml of deionized water to form a Li / Ni mixture. Slowly add the Ni / Li mixture to 0.5mol / L ammonium bicarbonate solution to fully react, wash the precipitate, and then Dry at 100°C to obtain Li-doped nano-scale NiO precursor powder. Disperse this composite powder in distilled water to form a suspension, and slowly add ethyl orthosilicate solution (containing about 0.03mol SiO 2 ), adjust the pH of the solution to about 7.5 to hydrolyze the ethyl orthosilicate and coat it on the Ni / Li powder to form a coating layer. The composite powder is filtered, washed, dried, granulated, dry pressed at 3MPa, and sintered in air at 1250°C for 2.5 hours to obtain Li 0.005 Si 0.03 Ni 0.965 O ceramic materials. XRD test shows that the phase is basically NiO phase. At room temperature, the relative dielectric constant ε=10200 (1kHz), and the dielectric constant does not change much with frequency. The microstructure picture of the mate...

Embodiment 2

[0029] The ethyl orthosilicate solution (about 0.15mol SiO 2 ), adjust the pH of the solution to about 3.5 to hydrolyze the ethyl orthosilicate to form a transparent sol. Weigh 0.01mol LiNO 3 , 0.84mol Ni(NO 3 ) 2Dissolve it in 400ml deionized water to form a Li / Ni mixture. Slowly add the Ni / Li mixture to the sol. Adjust the pH to about 7.2 to make it further gelatinize. Pre-fired at 300°C to obtain Li-doped nano-scale NiO precursor powder. The pre-fired powder was granulated, dry pressed at 4MPa, and sintered in air at 1250°C for 2.5 hours to obtain Li 0.01 Si 0.15 Ni 0.84 O ceramic materials. XRD test shows that most of the phase is NiO phase with a small amount of Ni 2 SiO 4 phase. At room temperature, the relative dielectric constant ε=1890 (10kHz), and the dielectric loss tanδ=0.42. Such as Figure 4 , Figure 5 Shown.

Embodiment 3

[0031] Weigh 0.01mol LiNO 3 , 0.79mol Ni(NO 3 ) 2 Dissolve it in 400ml deionized water to prepare a Li / Ni mixture. Slowly add the Ni / Li mixture to 0.8mol / L ammonium carbonate solution to fully react, wash the precipitate, and then Drying at ℃ to obtain Li-doped nano-scale NiO precursor powder. Disperse this composite powder in distilled water to form a suspension, and slowly add ethyl orthosilicate solution (about 0.20mol SiO 2 ), adjust the pH value of the solution to about 7.8 to hydrolyze the ethyl orthosilicate and coat the Ni / Li powder to form a coating layer. The composite powder is filtered, washed, dried, granulated, dry pressed at 3MPa, and sintered in air at 1250°C for 2.5 hours to obtain Li 0.01 Si 0.2 Ni 0.79 O ceramic materials. XRD test shows that most of the phase is NiO phase with a small amount of Ni 2 SiO 4 phase. At room temperature, the relative dielectric constant ε=870 (10kHz), and the dielectric loss tanδ=0.35. And in the temperature range of -10℃-170℃, the ...

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Abstract

The invention relates to a Li-Si-O-based high dielectric constant ceramic materials and method for synthesizing same, wherein the raw material includes Ni, Li sulphate, nitrate or chloride salt, the preparation consists of using ammonium carbonate or ammonium acid carbonate as precipitation reagent, synthesizing uniformly doped nano precursor powder through chemical precipitation method or sol-gal process, granulating, modeling, sintering, thus obtaining lithium, silicon doped nickel protoxide ceramics.

Description

Technical field [0001] The invention relates to a novel Li-Si-Ni-O-based high-dielectric constant ceramic material and a synthesis method thereof, and belongs to the technical field of oxide ceramic material preparation. Background technique [0002] With the continuous development of electronic information technology, especially hybrid integrated circuit and surface packaging technology, more and more attention has been paid to new functional ceramic components. Its development trend is mainly reflected in the miniaturization, integration and chipization of devices. , High frequency, high reliability. Among them, ceramic capacitors, especially ceramic capacitors with high specific capacitance, have developed rapidly in the past decade as an important electronic component, and their market demand is increasing day by day. High performance, high specific capacitance, miniaturization and low cost are the development trends of ceramic capacitor components. [0003] At present, the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/622C04B35/624H01B3/12H01G4/12
Inventor 林元华蒋磊王建飞南策文
Owner TSINGHUA UNIV
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