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Preparing process for vanadium dioxide powder

The technology of vanadium dioxide and vanadium pentoxide is applied in the fields of functional materials and inorganic chemistry, which can solve the problems of long reaction route, complicated control process and high reaction temperature, and achieve the effects of less environmental pollution, simple operation process and simple raw materials.

Inactive Publication Date: 2007-06-27
张家港楚人新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this scheme is that it is necessary to control the content of ammonium in the precursor to obtain vanadium dioxide, so the control process is complicated, and the reaction temperature is high and the reaction route is long

Method used

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  • Preparing process for vanadium dioxide powder
  • Preparing process for vanadium dioxide powder
  • Preparing process for vanadium dioxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Place 0.90 g of V 2 o 5 Disperse the powder into 40mL of methanol, then transfer it to an autoclave or a pressure-resistant tubular reactor, and after sealing it, gradually raise the temperature to 180°C, and the pressure at this time is 2.8Mpa. Maintained under these conditions for 6h. Turn off the heating, let the material cool down naturally, wash with deionized water and absolute ethanol, and dry it under vacuum at 60°C to obtain vanadium dioxide powder, and obtain 0.7962g of black VO 2 powder. Under the protection of nitrogen, a certain mass of the above-mentioned black powder was calcined at 500° C. for 3 h, and the XRD spectrum of the obtained black powder is shown in Figure 1 . As can be seen from accompanying drawing 1: gained product is crystallized VO 2 (M).

Embodiment 2

[0024] Place 0.90 g of V 2 o 5 The powder was dispersed in 40mL of ethanol, then transferred to an autoclave, and after sealing, the temperature was gradually raised to 180°C, and the pressure was 2.00Mpa at this time. Maintained under these conditions for 6h. Turn off the heating, let the material cool down naturally, wash with deionized water and absolute ethanol, and dry it under vacuum at 60°C to obtain vanadium dioxide powder, and obtain 0.2107g of black VO 2 powder. Under the protection of nitrogen, a certain mass of the above-mentioned black powder was calcined at 500°C for 3 hours, and the XRD spectrum of the obtained black powder is shown in Figure 2. As can be seen from accompanying drawing 1: gained product is crystallized VO 2 (M).

Embodiment 3

[0026] Place 0.90 g of V 2 o 5 The powder was dispersed into 40mL of hexanol, then transferred to an autoclave, and after sealing, the temperature was gradually raised to 180°C, and the pressure was 0.10Mpa at this time. Maintained under these conditions for 6h. Turn off the heating, let the material cool down naturally, wash with deionized water and absolute ethanol, and vacuum dry at 60°C to obtain vanadium dioxide powder, and obtain 0.3783g of black VO 2 powder. Under the protection of nitrogen, a certain mass of the above-mentioned black powder was calcined at 500° C. for 3 hours. The XRD spectrum of the obtained black powder is shown in Fig. 3 . As can be seen from accompanying drawing 3: gained product is crystallized VO 2 (M).

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Abstract

The vanadium dioxide powder preparing process includes dispersing vanadium pentoxide powder material in sufficient or solvent, heating to 140-190 deg.c at 0.05-10 MPa in a reactor and maintaining for 2-24 hr, naturally cooling, washing with deionized water and anhydrous alcohol, and vacuum drying to obtain vanadium dioxide powder. The vanadium dioxide powder may be further calcined at 300-800 deg.c in protecting inert gas for 1-12 hr to obtain crystallized vanadium dioxide. The present invention has the features of simple material, low cost, low reaction temperature, less environment pollution, etc.

Description

technical field [0001] The invention relates to a method for preparing vanadium dioxide powder, which belongs to the technical field of inorganic chemistry and also belongs to the technical field of functional materials. Background technique [0002] Vanadium dioxide (VO 2 ) is a thermochromic material, which is a blue-black powder at room temperature. The phase transition of vanadium dioxide is related to temperature. Around 68°C, the transition from semiconductor phase to metal phase occurs, and the resistivity abrupt change reaches 4-5 orders of magnitude. When the temperature is lower than 68°C, it has a monoclinic crystal structure, and when the temperature is higher than 68°C, it has a tetragonal crystal structure, that is, a thermally induced reversible semiconductor-metal phase transition occurs at 68°C. Due to the change of crystal structure, the photoelectric performance of vanadium dioxide has changed greatly, and the phase change is rapid, making vanadium dioxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 黄驰刘兴海易生平
Owner 张家港楚人新材料科技有限公司
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