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Method for preparing composite inorganic metal oxide

A technology of inorganic metals and oxides, which is applied in the field of preparation of composite metal oxides, can solve problems such as health hazards, and achieve the effect of being suitable for industrial production, with low toxicity and volatility

Active Publication Date: 2009-09-30
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses the poisonous ethylene glycol-methyl ether as the organic medium, which can be inhaled or absorbed through the skin and easily cause human health hazards

Method used

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  • Method for preparing composite inorganic metal oxide
  • Method for preparing composite inorganic metal oxide
  • Method for preparing composite inorganic metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Under stirring conditions, add 8.986g of barium acetate into 100ml of glycerol, and heat to 200°C to completely dissolve the barium acetate;

[0026] 2) Add 10.000g of titanium isopropoxide under stirring condition;

[0027] 3) Reflux for two hours and then cool to room temperature to obtain a homogeneous liquid precursor;

[0028] 4) Calcining the homogeneous liquid obtained in the step 3) at 450°C, 500°C, 550°C, 700°C, 900°C or 1100°C respectively, and keeping it warm for 3 hours to obtain a powder.

[0029] figure 1 is the XRD pattern of the powder obtained by calcination of the precursor at different temperatures. It can be clearly seen from the figure that when the calcination temperature is greater than 550°C, the cubic barium titanate begins to form, and as the temperature increases, the cubic barium titanate gradually turns into the tetragonal barium titanate.

[0030] figure 2 It is the SEM image of the barium titanate powder prepared by calcination of ...

Embodiment 2

[0032] Comparative test a:

[0033] 1) Add 12.567g of barium acetate into more than 50ml of ethanol, ethylene glycol or 1,3-propanediol under stirring conditions, and heat to 200°C;

[0034] 2) Add 14.000g titanium isopropoxide under stirring condition;

[0035] 3) After reflux for two hours, it was cooled to room temperature, and it was observed that a homogeneous system could not be formed.

[0036] Comparative test b:

[0037] 1) Add 12.567g of barium acetate into more than 50ml of glycerol under stirring conditions, and heat to 200°C;

[0038] 2) Add 14.000g titanium isopropoxide under stirring condition;

[0039] 4) Reflux for two hours and cool to room temperature to obtain a homogeneous liquid.

Embodiment 3

[0041] 1) Mix 50ml of glycerol and 50ml of ethylene glycol to obtain a solution;

[0042] 2) Add 7.054g of barium acetate under stirring condition, and heat to 200°C to completely dissolve the barium acetate;

[0043] 3) Add 10.000g of n-butoxytitanium under stirring condition;

[0044] 4) Reflux for two hours and then cool to room temperature to obtain a uniform and stable liquid precursor;

[0045] 5) Calcining the precursor at 700° C. for 3 hours to prepare white barium titanate powder.

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PUM

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Abstract

The invention discloses a method for preparing a composite inorganic metal oxide, which comprises the following steps: firstly, preparing a precursor of the composite inorganic metal oxide; and then, treating the precursor by a calcining or burning method, wherein the precursor is a homogeneous liquid substance formed by mixing liquid polylol and more than two metal organic salts, and the contentratio of all metal elements in the precursor accords with the requirement of forming the composite inorganic metal oxide. The method can prepare powder of various composite inorganic metal oxides of nano-scale crystal grains, which comprise barium titanate, calcium copper titanate, lithium titanate, strontium titanate, barium zirconate or strontium zirconate and the like.

Description

technical field [0001] The invention relates to a preparation method of composite metal oxides. Background technique [0002] The work of preparing nanopowders by sol-gel method began in the 1960s. In recent years, the sol-gel method has become an important wet chemical method for the synthesis of inorganic materials, and has been widely used in the preparation of glass, ceramics, thin films, fibers, composite materials, etc., and is widely used in the preparation of nanoparticles. The chemical process of the sol-gel method is first to disperse the precursor raw materials including metal alkoxides in an organic solvent, and then undergo a hydrolysis reaction to generate active monomers, and the active monomers are polymerized to become a sol, and then generate a sol with a certain spatial structure. The gel is dried and heat-treated to prepare nanoparticles and required materials or films. [0003] The sol-gel method has many unique advantages compared with other methods: ...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/632C04B35/462C04B35/48
Inventor 周小平杰夫·徐王科刘永明陈飞殷玉波
Owner MICROVAST POWER SYST CO LTD
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