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Cesium tungsten bronze powder and preparation method thereof

A technology of cesium tungsten bronze and powder, which is applied in the field of pure cesium tungsten bronze powder and its preparation, can solve the problems of harmfulness to the human body and the environment, high cost of raw materials, and easy volatility, so as to achieve wide application prospects and reduce production costs.

Inactive Publication Date: 2012-01-18
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, WCl 6 CsOH and CsOH have high raw material costs, and have disadvantages such as volatile, easy to hydrolyze, poor stability, harmful to human body and environment, and difficult to operate.

Method used

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  • Cesium tungsten bronze powder and preparation method thereof
  • Cesium tungsten bronze powder and preparation method thereof
  • Cesium tungsten bronze powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare Cs with Cs / W (molar ratio)=0.3:1 0.3 WO 3 Powder.

[0038] ① Prepare 0.5mol / L tungstic acid solution:

[0039] Weigh a certain amount of sodium tungstate, dissolve it in deionized water, and prepare a 0.5mol / L sodium tungstate solution, and use styrene cation exchange resin to ion-exchange the sodium tungstate solution to obtain 0.5mol / L tungstic acid solution;

[0040] ② Prepare cesium carbonate solution and citric acid solution;

[0041] Weigh 0.488g of cesium carbonate, dissolve in deionized water, and make a 0.3mol / L cesium carbonate solution; weigh 6.3g of citric acid, dissolve in deionized water, and make a 1mol / L citric acid solution;

[0042] ③ Preparation of Cs 0.3 WO 3 The reaction precursor solution;

[0043] Take 20ml of the 0.5mol / L tungstic acid solution prepared above, put it into a beaker, add 30ml of 1mol / L citric acid solution once during stirring, slowly add 5ml of 0.3mol / L cesium carbonate solution dropwise, and continue stirring for 1...

Embodiment 2

[0048] Prepare Cs with Cs / W (molar ratio)=0.3:1 0.3 WO 3 Powder.

[0049] ① Prepare 0.5mol / L tungstic acid solution: same as step ① in Example 1;

[0050] ② Prepare cesium carbonate solution and citric acid solution;

[0051] Weigh 0.488g of cesium carbonate, dissolve in deionized water, and make a 0.3mol / L cesium carbonate solution; weigh 12.6g of citric acid, dissolve in deionized water, and make a 2mol / L citric acid solution;

[0052] ③ Preparation of Cs 0.3 WO 3 The reaction precursor solution;

[0053] Take 20ml of the 0.5mol / L tungstic acid solution prepared above, put it into a beaker, add 30ml of 2mol / L citric acid solution once during stirring, slowly add 5ml of 0.3mol / L cesium carbonate solution dropwise, and continue stirring for 1h to obtain Preparation of Cs 0.3 WO 3 Powder reaction precursor solution, the concentration of tungstic acid in the precursor is 0.18mo / L, and the concentration of citric acid is 1.10mol / L;

[0054] ④Transfer the reaction precurs...

Embodiment 3

[0058] Prepare Cs with Cs / W (molar ratio)=0.3:1 0.3 WO 3 Powder.

[0059] ① Prepare 0.5mol / L tungstic acid solution: same as step ① in Example 1;

[0060] ② Preparation of cesium carbonate solution:

[0061] Weigh 0.488g of cesium carbonate, dissolve in deionized water, and make 0.3mol / L cesium carbonate solution;

[0062] ③ Preparation of Cs 0.3 WO 3 The reaction precursor solution;

[0063] Take 20ml of the above-prepared 0.5mol / L tungstic acid solution, put it into a beaker, add 12.6g of citric acid once during stirring, after stirring evenly, slowly add 5ml of 0.3mol / L cesium carbonate solution dropwise, and then add 30ml Absolute ethanol, continue to stir for 1h, obtain preparation Cs 0.3 WO 3 The reaction precursor solution of the powder, the concentration of tungstic acid in the precursor is 0.18mol / L, the concentration of citric acid is 1.10mol / L, and the volume ratio of alcohol to water is 3:2;

[0064] ④ Transfer the reaction precursor solution prepared abov...

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Abstract

The invention relates to cesium tungsten bronze powder and a preparation method thereof. The method comprises the following steps that: 1, precursor solution with tungstic acid, cesium carbonate and reducing substances is prepared according to a Cs / W mole ratio of 0.01 to 0.35 / 1, and the solvents are water or a mixture formed by ethanol and the water according to a volume ratio of 1 / 4 to 4 / 1; and 2, the precursor solution takes reaction for 1 to 3d under the condition of 180 to 200 DEG C in an autoclave, and the cesium tungsten bronze powder is obtained after the obtained precipitates are treated. The powder has the crystalline phase composition of Cs0.2WO3 or Cs0.32WO3, the size of the powder particle is 100 to 1300nm, and the specific surface area is 7 to 50m<2> / g. The synthetic process has the advantages that raw materials are cheap and mild, the operation is easy, the production cost can be reduced, in addition, the low-temperature (lower than or equal to 20 DEG C) synthesis is adopted, and the process is suitable for production and practical application. In addition, the product purposes are wide.

Description

technical field [0001] The invention relates to the field of ultrafine powder preparation in materials science, and relates to a structure-adjustable pure cesium tungsten bronze (Cs x WO 3 ) powder and its preparation method. Background technique [0002] In recent years, tungsten bronze has attracted much attention due to its interesting optoelectronic properties, photochromic and superconducting properties. It has been reported that tungsten oxide doped with monovalent cation Cs + After the formation of cesium tungsten bronze (Cs x WO 3 ) has excellent low-temperature superconductivity and low resistivity near room temperature (Physica C, 2002, 371: 321-329; J Supercond Nov Magn, 2008, 21: 145-150.). Recently, it was found that cesium tungsten bronze with hexagonal structure (Cs x WO 3 ) prepared glass surface transparent film has more excellent visible light transmission and near-infrared light shielding properties than ITO film (J.Am.Ceram.Soc., 2007, 90(12): 4059...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
Inventor 刘敬肖史非彭战军
Owner DALIAN POLYTECHNIC UNIVERSITY
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