Preparation method for vanadium trioxide doped powder material

A technology of vanadium trioxide powder and powder materials, applied in the direction of vanadium oxide, etc., which can solve the problems of environmental pollution, high preparation cost, and unsuitability for large-scale industrial production, and achieve good product quality, simple raw materials, and large-scale production. The effect of industrial production

Inactive Publication Date: 2012-09-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current hydrothermal method to prepare doped V 2 o 3 There are still some disadvantages: high preparation cost, polluting environment, dopant atoms cannot be effectively doped to V 2 o 3 crystal, not suitable for industrial mass production, etc.
In addition, cheap ammonium metavanadate was used as the initial raw material, which was converted into a complex after treatment with oxalic acid, and then hydrothermally treated with a reducing agent to obtain VO 2 , and then calcined to convert to V 2 o 3 , this method has not yet been reported

Method used

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  • Preparation method for vanadium trioxide doped powder material
  • Preparation method for vanadium trioxide doped powder material
  • Preparation method for vanadium trioxide doped powder material

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Embodiment 1

[0028] 0.234g ammonium metavanadate (NH 4 VO 3 ) and 0.126g oxalic acid (H 2 C 2 o 4 2H 2 0), was added to 30mL deionized water, and magnetically stirred until the solution became a uniform liquid. The obtained solution was transferred into a 50 mL hydrothermal kettle, and reacted for 48 hours at 180°C. After the reaction was completed, it was naturally cooled, and the obtained solid was centrifuged, washed and dried. Finally, the obtained solid powder was calcined at 700°C for 3 hours in an atmosphere of high-purity argon (99.999%) to obtain V 2 o 3 Powder material. The product was characterized by XRD as V 2 o 3 , see attached figure 1 , see attached table 1 for the phase transition temperature.

Embodiment 2

[0030] 0.234g ammonium metavanadate (NH 4 VO 3 ), 0.126g oxalic acid (H 2 C 2 o 4 2H 2 O) and 0.005g chromium chloride (CrCl 3 ·6H 2 O), added to 30mL of deionized water, and magnetically stirred until the solution became a homogeneous liquid. The obtained solution was transferred into a 50 mL hydrothermal kettle, and reacted for 48 hours at 180°C. After the reaction was completed, it was naturally cooled, and the obtained solid was centrifuged, washed and dried. Finally, the obtained solid powder was calcined at 700°C for 3 hours in an atmosphere of high-purity argon (99.999%) to obtain chromium-doped V 2 o 3 Powder material. The product was characterized by XRD as V 2 o 3 , see attached figure 1 , see attached table 1 for the phase transition temperature.

Embodiment 3

[0032] 0.234g ammonium metavanadate (NH 4 VO 3 ), 0.252g oxalic acid (H 2 C 2 o 4 2H 2 O) and 0.026g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), added to 30mL of deionized water, and magnetically stirred until the solution became a homogeneous liquid. The obtained solution was transferred into a 50 mL hydrothermal kettle, and reacted for 168 h at 160° C. After the reaction was completed, it was naturally cooled, and the obtained solid was centrifuged, washed and dried. Finally, the obtained solid powder was calcined at 1000°C for 1 h in an atmosphere of high-purity argon (99.999%) to obtain lanthanum-doped V 2 o3 Powder material. The product was characterized by XRD as V 2 o 3 , see attached image 3 , see attached table 1 for the phase transition temperature.

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Abstract

The invention discloses a preparation method for a vanadium trioxide doped powder material. The preparation method comprises the following steps of: by using a certain amount of ammonium metavanadate, oxalic acid, a doping agent and water as raw materials, uniformly mixing the raw materials according to quantitative proportions, then transferring the mixture to a polytetrafluoroethylene hydrothermal kettle for hydrothermal reaction, and after finishing reaction, centrifuging, washing, vacuumizing and calcining the mixture in an inertia atmosphere to obtain the vanadium trioxide powder doped powder material. The phase-transition temperature of the V2O3 doped powder can be effectively controlled by adjusting the doping amount of atoms. The preparation method for the vanadium trioxide doped powder material has the advantages of simple technological process, good product quality, low cost, environmental friendliness, easiness in control and capability of realizing the large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing a powder material doped with vanadium trioxide powder, and belongs to the field of inorganic functional materials. Background technique [0002] Vanadium trioxide crystals (V 2 o 3 ) exhibits a "metal-insulator phase transition" at about 160K, that is, the (MIT) phenomenon. V 2 o 3 There are two temperature-dependent phase transition points, a first-order phase transition from a low-temperature antiferromagnetic insulating phase (AFI) to a high-temperature paramagnetic metallic phase (PM) occurs at about 160K, and the resistivity changes in a negative temperature coefficient of resistance (NTC) The characteristic, that is, the resistance value decreases with the increase of temperature. At a temperature of about 550K, a secondary phase transition from a low-temperature paramagnetic metallic phase (PM) to a high-temperature paramagnetic insulating phase (PI) occurs, and the resistivity changes during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 刘兴海樊美娟张依福黄驰黎厚斌
Owner WUHAN UNIV
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