1results about "Chromium halides" patented technology

This invention provides a method for preparing spherical and sheet-like CrF3·3H2O micro / nano powders and their crystalline transformation. An HF acid solution is slowly added to Cr2AlB2 powder, and the mixture is stirred at 25-40°C for 4-20 h; the HF acid solution has a mass fraction of 20-45%. After the reaction, the resulting solution is washed successively with deionized water and anhydrous ethanol by centrifugation until neutral. The precipitate is then freeze-dried to obtain spherical CrF3·3H2O powder, which is then ultrasonically treated in an ethanol solution to fully expand and form a two-dimensional sheet-like material. This invention prepares spherical CrF3·3H2O micro / nano powders based on the selective etching reaction of hydrofluoric acid on Cr2AlB2. By adjusting the reaction conditions, CrF3·3H2O micro / nano powders with uniform morphology and narrow particle size distribution can be obtained, and the crystalline transformation of CrF3·3H2O can be achieved through heat treatment.