High-temperature hydrothermal mixing synthesis method for vanadium dioxide powder

Abstract

The invention discloses a high-temperature hydrothermal mixing synthesis method for vanadium dioxide powder. Raw materials are separated in the temperature rise process of synthetic powder, when the temperature rises to the reaction temperature of 100-260 DEG C, the raw materials are mixed, then reaction is performed, a reaction kettle is rotated while heat insulation is carried out, and the heat insulation continues for 4-48 hours. The vanadium dioxide powder synthesized by the high-temperature hydrothermal mixing synthesis method inherits all advantages of vanadium dioxide powder synthesized by the hydrothermal mixing synthesis method, is simple in process and low in energy consumption, and avoids producing interphase impurities in the temperature rise process of the hydrothermal method, so that powder with higher purity and better crystallinity can be obtained and the high-temperature hydrothermal mixing synthesis method for vanadium dioxide powder has a very wide application prospect.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a method for synthesizing metastable phase VO by hydrothermal high-temperature mixing 2 (B), metastable phase VO 2 (A), stable VO 2 (M) or VO 2 (R) Powder method. [0002] Background technique [0003] Since scientists first discovered VO in 1959 2 Since it has phase change properties, about VO 2 research has been attracting people's attention. where VO 2 The reversible phase transition of (R) / (M) phase is the earliest and most systematic direction studied, because the R / M phase will undergo metal-semiconductor transition (MST) at 341K (68°C), this reversible The first-order phase transition not only has a fast response speed, but also is accompanied by sudden changes in resistivity, magnetic susceptibility, and optical transmittance during the phase transition process, especially in the infrared light band. The variable temperature is closest to room temperature. Ther...

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Problems solved by technology

However, the metastable phase VO was synthesized by the hydrothermal high-temperature mixing method. 2 (B), metastable phase VO 2 (A), stable VO 2 (M) or VO 2 (R) powder has not been reported

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