Multi-case-layer structure X8R capacitor dielectric ceramic and preparation method thereof

A technology of shell structure and dielectric ceramics, which is applied in the field of multi-shell structure X8R capacitor dielectric ceramics and its preparation, can solve the problems of "shell-core" structure collapse and promote the diffusion rate of Nb and other dopants, and achieve Good high temperature stability and low dielectric loss

Active Publication Date: 2012-01-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pre-solid solution of other systems, especially unequivalent doping and doping with low melting point compounds, will promote the diffusion rate of dopants such as Nb, resulting in the collapse of the "shell-core" structure

Method used

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  • Multi-case-layer structure X8R capacitor dielectric ceramic and preparation method thereof
  • Multi-case-layer structure X8R capacitor dielectric ceramic and preparation method thereof
  • Multi-case-layer structure X8R capacitor dielectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of multi-shell structure X8R capacitor dielectric ceramics, it comprises the steps:

[0031] 1) preparation sol: the Nb of 50g 2 o 5 Dissolve in 250mL of HF at 90°C, add 100mL of stabilizer ammonium oxalate aqueous solution (concentration of the ammonium oxalate aqueous solution is 0.1g / mL) after 10 hours of sufficient reaction, stir fully and drop in ammonia water to adjust the pH value to 10[ Generate Nb(OH) 5 white precipitate], then aged at 80°C for 12 hours, filtered with suction, and the precipitate was washed with water [to remove NH 4 + 、C 2 o 4 2- , F - ], to get Nb(OH) 5 White precipitate; Nb(OH) 5 Dissolve in 100mL citric acid aqueous solution (the concentration of described citric acid aqueous solution is 1g / mL) after the white precipitate is dried, make Nb(OH) 5 The white precipitate is completely dissolved to obtain a stable Nb salt sol; use ICP to measure Nb in the Nb salt sol 5+ Concentration, spare;

[0032] Nb in Nb s...

Embodiment 2

[0041] The preparation method of multi-shell structure X8R capacitor dielectric ceramics, it comprises the steps:

[0042] 1) preparation sol: the Nb of 50g 2 o 5 Dissolve in 250mL of HF at 90°C, add 120mL of ammonium oxalate aqueous solution (concentration of the ammonium oxalate aqueous solution is 0.1g / mL) after 10 hours of full reaction, stir well and add ammonia water dropwise to adjust the pH value to 10 [Nb (OH) 5 white precipitate], then aged at 80°C for 12 hours, filtered with suction, and the precipitate was washed with water [to remove NH 4 + 、C 2 o 4 2- , F - ], to get Nb(OH) 5 White precipitate; Nb(OH) 5 Dissolve in 100mL citric acid aqueous solution (the concentration of described citric acid aqueous solution is 1g / mL) after the white precipitate is dried, make Nb(OH) 5 The white precipitate is completely dissolved to obtain a stable Nb salt sol; use ICP to measure Nb in the Nb salt sol 5+ Concentration, spare;

[0043] Nb in Nb salt sol 5+ , Co(NO ...

Embodiment 3

[0052] The preparation method of multi-shell structure X8R capacitor dielectric ceramics, it comprises the steps:

[0053] 1) preparation sol: the Nb of 50g 2 o 5 Dissolve in 250mL of HF at 90°C, add 150mL of ammonium oxalate aqueous solution (concentration of the ammonium oxalate aqueous solution is 0.1g / mL) after 10 hours of full reaction, stir well and add ammonia water dropwise to adjust the pH value to 10 [Nb (OH) 5 white precipitate], then aged at 80°C for 12 hours, filtered with suction, and the precipitate was washed with water [to remove NH 4 + 、C 2 o 4 2- , F - ], to get Nb(OH) 5 White precipitate; Nb(OH) 5 Dissolve in 100mL citric acid aqueous solution (the concentration of described citric acid aqueous solution is 1g / mL) after the white precipitate is dried, make Nb(OH) 5 The white precipitate is completely dissolved to obtain a stable Nb salt sol; use ICP to measure Nb in the Nb salt sol 5+ Concentration, spare;

[0054] Nb in Nb salt sol 5+ , Co(NO ...

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Abstract

The invention relates to multi-case-layer structure X8R capacitor dielectric ceramic and a preparation method thereof. The multi-case-layer structure X8R capacitor dielectric ceramic is characterized by being prepared from BaTiO3-Nb2O5-Co2O3-Sm2O3-CeO2 powder and 0.5BaTiO3-0.5Bi(Mg1/2Ti1/2)O3 powder, wherein the molar ratio of the BaTiO3-Nb2O5-Co2O3-Sm2O3-CeO2 powder to the 0.5BaTiO3-0.5Bi(Mg1/2Ti1/2)O3 powder is x/1, and x is greater than or equal to 4 but is smaller than or equal to 8. The capacitor dielectric ceramic prepared by the method has the characteristics of wide work temperature range and high stability.

Description

technical field [0001] The invention relates to a multi-shell structure X8R capacitor dielectric ceramic and a preparation method thereof. Background technique [0002] Multilayer ceramic capacitor (MLCC) dielectric materials with high performance and high temperature stability have always been a research hotspot. Currently, X7R (-55℃~125℃, ΔC / C 25℃ <±15%) The formulation and preparation process of MLCC materials are relatively mature, and BaTiO 3 X7R-based MLCC materials have been successfully commercialized and widely used. Compared with X7R type MLCC, X8R (-55℃~150℃, ΔC / C 25℃ <±15%) materials have a wider operating temperature range, and the upper limit of the operating temperature can reach 150°C. However, the dielectric materials used to manufacture such large-capacity thermally stable MLCCs are still mainly doped with Nb, Co and other oxides such as BaTiO 3 Form a "shell-core" structure. Its crystal core composition corresponds to (pure BaTiO 3 ) has a die...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 郝华熊博肖嫚刘韩星曹明贺尧中华
Owner WUHAN UNIV OF TECH
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