Method for preparing hypovanadic oxide doped powder material

Abstract

The invention discloses a method for preparing hypovanadic oxide powder-doped material, which belongs to the production and preparation field of inorganic functional materials and relates to the preparation of hypovanaic oxide powder doped with W, Mo or W / Mo. The method comprises the following steps: mixing and evenly grinding a vanadium source, a doped raw material and an auxiliary agent, pouring the mixture after being molten at a high temperature and keeping the temperature for a certain period of time into cold water to be rapidly water-quenched, drying the formed gel to form dry gel, thermal-reducing the grinded dry gel in the reduction atmosphere, performing annealing treatment in a protective atmosphere, and realizing the crystalling phase conversion at a constant temperature so as to obtain M-phase VO2 with phase transition property. The phase transition temperature of the VO2 powder after doping can be effectively controlled by adjusting the W and Mo atom doping amount. The invention has remarkable advantage in the aspects of preparation cost, product performance, technique flow, friendly environment, economic profit, and the like, has easily available raw materials, simple and convenient synthesis, low requirement on the equipment and high product performance, is suitable for industrial production and has wide application of product.

Description

technical field [0001] The invention belongs to the field of production and preparation of inorganic functional materials, and relates to a low-cost preparation method of doped vanadium dioxide powder material with phase transition characteristics. Background technique [0002] Vanadium dioxide (VO 2 ) is a kind of metal oxide with phase transition characteristics. It will undergo a reversible phase transition from low-temperature monoclinic phase (M phase) to high-temperature tetragonal rutile phase (R phase) at about 68 ° C. Accompanied by this structural change, its Physical properties such as electrical conductivity, magnetic susceptibility, light transmittance, resistivity and reflectivity will change suddenly, so that VO 2 It is widely used in intelligent temperature control films, thermistor materials, photoelectric switch materials, infrared detection materials, laser protective layers and other fields. In order to widen the VO 2 Fields of application and improvin...

AI Technical Summary

Problems solved by technology

From the practical results, although doped vanadium dioxide powder can be prepared, the prepared VO 2 There are many miscellaneous phases, it is difficult to obtain pure M-phase VO 2 (A phase, B phase, M phase and R phase VO 2 , where M-phase VO 2 and R phase VO 2 Reversible thermal phase transition occurs); doping atoms cannot be effectively doped into the lattice, the doping activity is low, and it is difficult to control the phase transition temperature; the process steps are cumbersome, the energy consumption is relatively large, and the preparation cost is high. also have adverse effects on the environment and the health of the operator