Method of making cesium aluminum fluoride
1. Preface
If you want to get cesium aluminum fluoride, you must have a method. The method described here is a record of alchemy.

2. Selection of raw materials
To make cesium aluminum fluoride, you need to select raw materials. Cesium compounds, such as cesium carbonate, cesium hydroxide, etc., should be taken as pure; aluminum compounds, such as aluminum hydroxide, aluminum sulfate, etc., also need to be pure. Fluoride, such as hydrofluoric acid, its concentration and purity are related to the quality of the product and cannot be ignored.

III. Method of reaction
1. ** Solution reaction method **: Dissolve the selected cesium compound and aluminum compound in an appropriate amount of solvent, such as pure water, according to a certain ratio. Stir well to form a homogeneous solution. Then, slowly add hydrofluoric acid. During this process, the reaction temperature and rate must be controlled. If the temperature is too high, the reaction will be excessive and the product may be impure; if the temperature is too low, the reaction will be slow and time-consuming. When maintaining a suitable temperature, it is usually between [X] ° C and [X] ° C. At the same time, stirring cannot be stopped, so that the reactants are fully contacted to promote the complete reaction.
2. ** Solid-phase reaction method **: If the solid-phase reaction method is used, the cesium compound, aluminum compound and fluoride are first weighed accurately according to the predetermined ratio and mixed evenly. Place in a special container and heat in a high-temperature furnace. The heating rate should also be paid attention to, not too fast or too slow. At high temperatures, various substances undergo solid-phase reaction to form cesium aluminum fluoride. The reaction temperature is mostly between [X] ° C and [X] ° C, depending on the specific raw materials and reaction conditions.

Fourth, the precipitation of the product
1. ** Solution reaction post-treatment **: After the solution is reacted, the resulting mixed solution may form a precipitation or be a homogeneous solution. If there is precipitation, the solid-liquid separation can be separated by filtration. The resulting solid is washed several times with pure water to remove its impurities, and then dried to obtain a crude product of cesium aluminum fluoride. If it is a solution, it needs to be evaporated and concentrated to precipitate the solute, and then filtered, washed, dried and other steps to obtain a crude product.
2. ** Solid-phase reaction post-treatment **: After the solid-phase reaction is completed, the product is to be cooled and removed from the reaction vessel. Wash several times with an appropriate solvent, such as dilute acid or pure water, to remove unreacted raw materials and impurities. After that, after drying treatment, the crude product of cesium aluminum fluoride is obtained.

Fifth, the method of refining
The crude product of cesium aluminum fluoride still contains impurities and needs to be refined to improve its purity. The method of recrystallization can be used to dissolve the crude product in an appropriate solvent, heat it to dissolve, and then slowly cool down to make the cesium-aluminum fluoride crystallize. Filtration collects crystals, and then dries to obtain high-purity cesium-aluminum fluoride. Or use other refining methods, such as chromatography, to separate the impurities according to the different properties of cesium-aluminum fluoride, so as to achieve the purpose of refining.

6. Conclusion
The method of preparing cesium-aluminum fluoride requires careful preparation of raw materials, reactions, precipitates, and refining steps. According to these methods, the required cesium-aluminum fluoride can be prepared to meet the needs of all parties.