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Method for preparing composite metal oxide

A composite metal and oxide technology, which is applied in the preparation of oxides/hydroxides, etc., can solve the problems of adverse effects on the purity of final products, unfavorable large-scale production, and difficulty in obtaining materials, and achieve uniform components, regular shapes, The effect of low raw material cost

Active Publication Date: 2013-06-12
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the alkali in this method uses KOH or NaOH, cationic impurities will be introduced, which will adversely affect the purity of the final product. If an organic strong alkali is used, the raw material cost is high, which is not conducive to large-scale production; and if NH 4 OH, the alkalinity is not strong enough, and the precipitated substance is difficult to obtain BaTiO 3 and BaSn(OH) 6

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of pure barium titanate powder includes the following steps:

[0053] 1) Prepare an aqueous solution with 0.1 mol of titanium tetrachloride solute (the content of titanium tetrachloride is 50% by mass percentage);

[0054] 2) Under stirring conditions, the above-mentioned aqueous solution of titanium tetrachloride is added to ammonia water with an ammonia content of 0.5 mol (wherein NH 3 Content is calculated as 25% by mass percentage,), obtains white amorphous titanium oxide;

[0055] 3) Use distilled water to wash the metal compound precipitate obtained in the previous step, and wash away the ammonium chloride;

[0056] 4) After the washed metal compound is precipitated and stirred into a slurry, it is added to 400ml of 0.25M barium hydroxide aqueous solution, heated to 100°C, stirred and refluxed for 4 hours;

[0057] 5) Dry at 120°C to obtain barium titanate powder, XRD analysis see figure 1 .

Embodiment 2

[0059] 1) Dissolve 0.1mol of titanium tetrachloride and 0.1mol of barium nitrate in 400ml of distilled water to form a homogeneous solution;

[0060] 2) The above mixed solution is added to ammonia water with an ammonia content of 0.5mol (wherein NH 3 Content is calculated as 25% by mass percentage), while heating and stirring for 4 hours;

[0061] 3) Use distilled water to wash the precipitate obtained in the previous step;

[0062] 4) Dry the washed product at 120°C.

[0063] Gained product is carried out XRD analysis, from XRD pattern (attachment figure 2 ) It can be seen that no barium titanate crystal phase appears.

[0064] This example is a comparative example of Example 1, using a one-step precipitation method similar to the method disclosed in Japanese Patent JP94021035-B2 to synthesize barium titanate. However, as can be seen from the results shown in the final XRD pattern, compared with the method of the present invention, although the method also uses ammonia,...

Embodiment 3-11

[0066] The composite metal oxide (target product) in the following table 1 is obtained according to the following methods and steps:

[0067] 1) Prepare an aqueous solution with 0.1mol A solute (A solute content is calculated as 50% by mass percentage);

[0068] 2) Under stirring conditions, the aqueous solution of the above-mentioned A solute is added to ammonia water (wherein NH 3 Content is calculated as 25% by mass percentage), obtains metal compound;

[0069] 3) Use distilled water to wash the precipitated metal compound obtained in the previous step;

[0070] 4) After the washed metal compound is precipitated and beaten into a slurry, it is added to 400ml of B aqueous solution, heated to 100°C, and stirred and refluxed for 4 hours;

[0071] 5) drying the reaction at 120°C;

[0072] 6) Crystallize the dried powder at a high temperature of 600° C. for 3 hours.

[0073] Table 1

[0074]

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Abstract

The invention provides a wet-chemical method for preparing a composite metal oxide. The method mainly comprises the following steps of: providing aqueous solution or acid solution of any one metal element of which the oxide or the hydroxide is water insoluble; adding the aqueous solution or the acid solution of the metal element into ammonia water to totally precipitate metal ions; washing the precipitated metal ions; adding the precipitated metal ions into metallic alkaline solution; stirring, heating and refluxing to form a precursor slurry; and drying and performing heat treatment on the slurry to obtain the composite metal oxide. The composite inorganic metal oxide prepared by using the method comprises titanate, zirconate, niobate, manganate, cobaltate and the like and metal doped compounds thereof. The method has the advantages of capability of preparing composite metal oxide powder which has a regular shape and ultrafine grains, no introduced impurities of the metal ions in thepreparation process, contribution to the preparation of high-purity composite metal oxide powder, simple synthetic method, low cost of raw materials, and easy implementation.

Description

technical field [0001] The invention relates to a preparation method of composite metal oxide. Background technique [0002] Due to their unique structures and properties, composite metal oxides have a wide range of applications, such as dielectric materials, piezoelectric materials, thermoelectric materials, electrode materials, catalysts, etc. The morphology and structure of the composite oxide powder are closely related to the properties of the material, so the preparation method of the powder has a very important influence on the properties of the material. At the same time, the preparation of high-purity and ultra-fine powder is also the key to the preparation of high-performance materials. [0003] The traditional preparation method of composite metal oxides is solid-state reaction method, which is simple in process, easy to industrialize, and applicable to a wide range of elements, and is still widely used today. However, the solid-state reaction method requires mul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/14
Inventor 刘永明付凌雁周小平杰夫·徐
Owner MICROVAST POWER SYST CO LTD