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Method for preparing (Ba, Sr) TiO3 nano powder by virtue of Mg<2+> doped hydro-thermal method

A technology of nano-powder and hydrothermal method, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., which can solve problems such as hindering the application of alcohol energy and being easily broken down, so as to ensure solid solution and improve energy storage Characteristics and the ability to resist breakdown, the effect of powder phase purity

Active Publication Date: 2015-07-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as grain boundaries, voids, impurities, and surface defects, (Ba,Sr)TiO 3 It is easy to be broken down at a lower electric field, which hinders its application in alcohol energy; that is, such a defect makes people pay attention to how to improve the breakdown field strength of the material, thereby increasing the energy storage density of the material superior

Method used

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  • Method for preparing (Ba, Sr) TiO3 nano powder by virtue of Mg&lt;2+&gt; doped hydro-thermal method
  • Method for preparing (Ba, Sr) TiO3 nano powder by virtue of Mg&lt;2+&gt; doped hydro-thermal method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Add the first KOH solution with a concentration of 4.5-5.5mol / L to Sr(NO 3 ) 2 Mix well in the solution, where Sr(NO 3 ) 2 The molar ratio of KOH and KOH is 1:1 to obtain mixed solution A; while TiCl 4 Add dropwise to the second KOH solution with a concentration of 3-4.5mol / L and mix evenly, in which TiCl 4 The molar ratio of KOH and KOH is 1:3.8 to obtain mixed solution B; then press Sr(NO 3 ) 2 and TiCl 4 The molar ratio is 1:0.5, take the mixed solution A and the mixed solution B and mix evenly to obtain the SrTiO containing SrTiO 3 complexes; the presence of SrTiO in an alkaline environment 3 Put the complex into a hydrothermal kettle to fully react, the filling rate is 75%, the condition of hydrothermal reaction is 190 ℃, keep warm for 8h, and obtain SrTiO in alkaline environment 3 powder; the synthesized SrTiO in an alkaline environment 3 After the powder was washed with deionized water until the pH value was 5, it was dried at 70°C for 12 hours t...

Embodiment 2

[0033] Step 1: Add the first KOH solution with a concentration of 4.5-5.5mol / L to Sr(NO 3 ) 2 Mix well in the solution, where Sr(NO 3 ) 2 The molar ratio of KOH and KOH is 1:1.5 to obtain mixed solution A; while TiCl 4 Add dropwise to the second KOH solution with a concentration of 3-4.5mol / L and mix evenly, in which TiCl 4 The molar ratio of KOH and KOH is 1:4.1 to obtain mixed solution B; then press Sr(NO 3 ) 2 and TiCl 4 The molar ratio is 1:0.8, take the mixed solution A and the mixed solution B and mix evenly to obtain the presence of SrTiO in the alkaline environment 3 complexes; the presence of SrTiO in an alkaline environment 3 Put the complex into a hydrothermal kettle to fully react, the filling rate is 80%, the condition of hydrothermal reaction is 195 ℃, keep warm for 9h, get the SrTiO in the alkali environment 3 powder; the synthesized SrTiO in an alkaline environment 3 After the powder was washed with deionized water until the pH value was 6, it was drie...

Embodiment 3

[0037] Step 1: Add the first KOH solution with a concentration of 4.5-5.5mol / L to Sr(NO 3 ) 2 Mix well in the solution, where Sr(NO 3 ) 2 The molar ratio of KOH and KOH is 1:1.2 to obtain mixed solution A; while TiCl 4Add dropwise to the second KOH solution with a concentration of 3-4.5mol / L and mix evenly, in which TiCl 4 The molar ratio of KOH and KOH is 1:4.5 to obtain mixed solution B; then press Sr(NO 3 ) 2 and TiCl 4 The molar ratio is 1:0.6, take the mixed solution A and the mixed solution B and mix evenly to obtain the presence of SrTiO in the alkaline environment 3 complexes; the presence of SrTiO in an alkaline environment 3 The complex of the compound is put into a hydrothermal kettle to fully react, and the filling rate is 85%. 3 powder; the synthesized SrTiO in an alkaline environment 3 After the powder was washed with deionized water until the pH value was 7, it was dried at 60°C for 8 hours to obtain SrTiO 3 Powder.

[0038] Step 2: TiCl 4 Add BaCl w...

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Abstract

The invention relates to a method for preparing (Ba, Sr) TiO3 nano powder by virtue of a Mg<2+> doped hydrothermal method. The method comprises the following steps: taking BaTiO3 powder and SrTiO3 powder which are synthesized by a hydrothermal method, adding water, mixing fully, then adding MgCl2, and mixing uniformly to obtain a mixed solution; and pouring the mixed solution into a hydrothermal kettle, preserving the heat at 120-180 DEG C for 4-8 hours to perform hydrothermal reaction, and performing centrifugal drying on a generated precipitate to obtain Mg<2+> doped (Ba, Sr) TiO3 nano powder. According to the method provided by the invention, the BaTiO3 powder and SrTiO3 powder which are prepared by the hydrothermal method are adopted as raw materials, then a minute quantity of MgCl2 is doped into the raw materials, and then the Mg<2+> doped (Ba, Sr) TiO3 powder is prepared by using the hydrothermal method under the condition that a mineralizer is not added, so that secondary reaction is effectively avoided, and the prepared powder is high in purity and uniform and meticulous in crystal grain, reaches a nano scale, and can effectively improve the energy storage characteristic and the breakdown resistance of ceramic when used for preparing the ceramic.

Description

technical field [0001] The present invention relates to a kind of (Ba,Sr)TiO 3 The preparation method of nanopowder, especially a kind of by doping Mg 2+ Preparation of (Ba,Sr)TiO by Hydrothermal Method 3 nanopowder method. Background technique [0002] Energy storage capacitors have the advantages of high energy storage density, fast charge and discharge speed, anti-cycle aging, suitable for extreme environments such as high temperature and high pressure, and stable performance. They meet the requirements of energy utilization in the new era and play an increasingly important role in power and electronic systems. important role. The energy storage density determines the performance of capacitor ceramics. For different dielectric ceramics, the principle of energy storage is basically the same. (Ba,Sr)TiO 3 Integrated BaTiO 3 The high dielectric constant and SrTiO 3 Excellent properties such as high dielectric strength and low dielectric loss, thus becoming a ferroelec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C04B35/468C04B35/47C04B35/626B82Y30/00
Inventor 蒲永平郭一松刘雨雯靳乾
Owner SHAANXI UNIV OF SCI & TECH
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