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Method for regulating and controlling insulating framework of high-dielectric and high-voltage-resistant SrTiO3 dielectric ceramic

A technology of dielectric ceramics and insulating skeleton, which is applied in the field of insulating skeleton regulation of SrTiO3 dielectric ceramics, can solve the problems of complex process, poor stability of material parameters, small insulation resistivity, etc., and achieve simple preparation process, low equipment requirements, dielectric The effect of small electric constant

Active Publication Date: 2022-07-15
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the dielectric constant and resistivity of the three types of STO dielectric ceramic materials cannot be effectively regulated
The melting and infiltration method is used to melt and infiltrate high-resistance materials on the STO grain boundary, so as to adjust the resistance value and breakdown resistance of STO, but the process is complicated, the stability of material parameters is poor, and the adjustment range is extremely limited.
For example, the patent "A Strontium Titanate Dielectric Ceramic with Giant Dielectric Constant and Its Preparation Method" (Application No.: 202110653474.6) discloses the preparation of Sr by doping modification using traditional solid-state method. 1-x Eu x TiO 3 Dielectric ceramics, when x=0.01, its dielectric constant ε=10544, and its insulation resistivity is only 1.04×10 8 Ω cm, poor pressure resistance; patent "a preparation of SrTiO 3 A method for dielectric ceramic materials with a large dielectric constant" (application number: 201810107739.0) discloses the use of SrTiO 3 , Nb 2 o 5 , Li 2 CO 3 , SiO 2 、In 2 o 3 , MnO 2 , CuO and glass powder are prepared according to a certain mass percentage of dielectric ceramics, although the dielectric constant reaches 1.55×10 5 , the insulation resistivity is 9.38×10 8 Ω·cm, so the insulation resistivity is small, and a wide variety of dopants are used

Method used

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  • Method for regulating and controlling insulating framework of high-dielectric and high-voltage-resistant SrTiO3 dielectric ceramic
  • Method for regulating and controlling insulating framework of high-dielectric and high-voltage-resistant SrTiO3 dielectric ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A High Dielectric, High Voltage SrTiO 3 The preparation method of dielectric ceramics comprises the following steps:

[0028] (1) First according to SrTiO 3 with Sr(NO 3 ) 2 The molar ratio is 100:1 to weigh 2.500g SrTiO 3 , 0.0288g Sr(NO 3 ) 2 , press Sr(NO 3 ) 2 The molar ratio to the complexing agent is 1:8, and 0.0655g of urea is weighed. Deionized water was used as solvent.

[0029] (2) Preparation of SrTiO 3 Stable suspension: Preparation of SrTiO using Triton X-100 as dispersant 3 Stable suspension. Add SrTiO to the beaker 3 Powder, pour in deionized water, and use a glass rod to stir to initially disperse SrTiO 3 After powder, add dispersant and continue to stir for 2min, then ultrasonically shake for 30min.

[0030] (3) Preparation of precursor-coated SrTiO 3 Composite powder: Sr(NO 3 ) 2 Dissolve in deionized water and add complexing agent urea. Add the prepared solution to the above SrTiO 3 In the stable suspension, stirred for 1 h in a con...

Embodiment 2

[0035] A High Dielectric, High Voltage SrTiO 3 The preparation method of dielectric ceramics comprises the following steps:

[0036] (1) First according to SrTiO 3 with Sr(NO 3 ) 2 The molar ratio of 100:1.5 weighs 2.500g SrTiO 3 , 0.0433gSr (NO 3 ) 2 , press Sr(NO 3 ) 2 The molar ratio to the complexing agent is 1:8, 0.0982 g of urea is weighed, and deionized water is used as the solvent.

[0037] (2) Preparation of SrTiO 3 Stable suspension: Preparation of SrTiO using Triton X-100 as dispersant 3 Stable suspension. Add SrTiO to the beaker 3 Powder, pour in deionized water, and use a glass rod to stir to initially disperse SrTiO 3 After powder, add dispersant and continue to stir for 2min, then ultrasonically shake for 30min

[0038] (3) Preparation of precursor-coated SrTiO 3 Composite powder: Sr(NO 3 ) 2 Dissolve in deionized water and add complexing agent urea. Add the prepared solution to the above SrTiO 3 The stable suspension was stirred in a constant ...

Embodiment 3

[0043] A High Dielectric, High Voltage SrTiO 3 The preparation method of dielectric ceramics comprises the following steps:

[0044] (1) First according to SrTiO 3 with Sr(NO 3 ) 2 The molar ratio is 100:2.5 to weigh 2.500g SrTiO 3 , 0.0721gSr(NO 3 ) 2 , press Sr(NO 3 ) 2 The molar ratio to the complexing agent is 1:8, 0.1637 g of urea is weighed, and deionized water is used as the solvent.

[0045] (2) Preparation of SrTiO 3 Stable suspension: Preparation of SrTiO using Triton X-100 as dispersant 3 Stable suspension. Add SrTiO to the beaker 3 Powder, pour in deionized water, and use a glass rod to stir to initially disperse SrTiO 3 After powder, add dispersant and continue to stir for 2min, then ultrasonically shake for 30min.

[0046] (3) Preparation of precursor-coated SrTiO 3 Composite powder: Sr(NO 3 ) 2 Dissolve in deionized water and add complexing agent urea. Add the prepared solution to the above SrTiO 3 The stable suspension was stirred in a constan...

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Abstract

The invention discloses a method for regulating and controlling an insulating framework of high-dielectric and high-voltage-resistant SrTiO3 dielectric ceramic, the insulating framework is Sr3Ti2O7, Sr3Ti2O7-coated SrTiO3 composite powder is prepared by regulating the molar ratio of SrTiO3 to Sr (NO3) 2 and adopting a liquid-phase coating method, and then the composite powder is subjected to ceramic semiconduction to obtain dielectric ceramic materials with different dielectric constants and resistance values. According to the regulation and control method for the insulating framework of the high-dielectric and high-voltage-resistant SrTiO3 dielectric ceramic, the dielectric constant and the insulation resistivity of SrTiO3 can be regulated by coating and regulating the thickness of the insulating framework.

Description

technical field [0001] The invention relates to the field of ceramic capacitor dielectric materials, in particular to a high-dielectric, high-voltage SrTiO 3 A method for regulating the insulating skeleton of dielectric ceramics. Background technique [0002] With the consumption of non-renewable energy, people focus on the development and utilization of energy. In order to solve the problems of traditional energy, people started to look for clean, non-polluting renewable energy such as wind energy and solar energy. With the further development of science and technology, in addition to the collection and conversion of renewable energy, energy storage technology has received increasing attention. The key to energy storage technology is to develop energy storage devices that meet application needs. Energy storage devices mainly include batteries, fuel cells, supercapacitors and dielectric capacitors. Among these energy storage components, batteries and electrochemical cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622H01G4/12
CPCC04B35/47C04B35/622H01G4/1227C04B2235/602C04B2235/6562C04B2235/6567C04B2235/6582
Inventor 洪涛黄容潘翔李成宇齐世顺
Owner HEFEI UNIV OF TECH
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