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Method for preparing double functional ceramics of pressure-sensitive capacitance based on SrTiO3

A dual-function, capacitor technology, which is applied in the field of preparing low-voltage SrTiO3-based varistor capacitor dual-function ceramics, can solve the problems of high sintering temperature, unstable performance consistency, and high varistor voltage of prepared materials, so as to achieve stable material performance and reduce sintering The effect of temperature and uniform dispersion

Inactive Publication Date: 2007-01-17
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

[0003] At present, although these two methods are relatively mature in technology, they have defects such as high sintering temperature, high varistor voltage of the preparation material, and unstable performance consistency, which cannot meet the application requirements of low-voltage circuits and the development of the industrialization of preparation technology.

Method used

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  • Method for preparing double functional ceramics of pressure-sensitive capacitance based on SrTiO3

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of nano-donors, acceptors and modified additives by liquid-phase chemical method

[0023] (1)La 2 o 3 Preparation of nanodonors. Analytical pure La(NO 3 ) 3 ·6H 2 O is the raw material, and chemically pure polyethylene glycol (PEG-2000) is the dispersant. Accurately weigh La(NO 3 ) 3 ·6H 2 5 g of raw material O was dissolved in 11.55 ml of deionized water to prepare a 1 mol / L solution, weighing 20 g of PEG, and dissolving the PEG in 100 ml of water according to the PEG:water mass ratio of 2:10. Then it was connected with PEG:La(NO 3 ) 3 ·6H 2 O is the mass ratio of 2:1. Add 12.5ml of PEG solution to the above prepared 1mol / L La(NO 3 ) 3In the solution, heat to 80°C in a magnetic stirring heating mantle, keep constant temperature, and stir evenly. After 2 hours, a translucent sol is obtained, and naturally cooled to room temperature to obtain a white gel. After the gel was washed and filtered, it was heat-treated in a box-type resistance fur...

Embodiment 2

[0035] The process is as in example 1, the difference is that in SrTiO 3 In the specific process (4) of the preparation of the base varistor bifunctional ceramics, in N 2 Sintering at 1400°C in +C reducing atmosphere. Others are the same.

Embodiment 3

[0037] The process is as in example 1, the difference is that in SrTiO 3 In the specific process (4) of the preparation of the base varistor bifunctional ceramics, in N 2 Sintering at 1440°C in +C reducing atmosphere. Others are the same.

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Abstract

The present invention provides a method for preparing SrTiO3 base functional ceramics by utilizing nano doping technology. Said invention adopts liquid-phase chemical method to prepare donor of La2O3 nano, acceptor of nano and modification additive Mn+Al+Si multicomponent oxide. The preparation of SrTiO3 base voltage-sensing capacitor double-function ceramic material mainly includes the following steps: firstly material preparation can obtain nano-donor La2O3 doped SrTiO3 main crystal phase; and second material preparation can obtain nano powder body MnO2, Al2O3 and SiO2 doped composite ceramic material.

Description

technical field [0001] The invention belongs to electronic material engineering, and in particular relates to a liquid-phase chemical method for preparing nanometer donors, acceptors and modified additives, thereby preparing low-pressure SrTiO 3 A method for bifunctional ceramics based on varistors. Background technique [0002] SrTiO 3 Semiconductor materials not only have pressure-sensitive properties but also have excellent dielectric properties, good surge absorption function and self-resetting function, because of their low varistor voltage, low dielectric loss, fast response speed, and good frequency and temperature characteristics. , making it a good varistor-capacitance dual-function element, especially in eliminating the spike interference of electronic components, improving the compatibility of electronic equipment and overvoltage protection. Currently SrTiO 3 There are mainly two traditional methods for the preparation of base varistor-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/47C04B35/622
Inventor 季惠明徐明霞李翠霞张周
Owner TIANJIN UNIV