Nanosize Cesium Tungstate Powder Prepared from Ammonium Paratungstate

Nanosize cesium tungstate powder is widely used in field of transparent insulation thin film such as EVA film, optical filter and so on. And it can also used in laser marking and welding, near infrared light heat treatment drugs.

Cesium tungstate has unique properties in different bands of light as follows:
1. The absorption property is very strong in the near infrared region of the wavelength 800-1100nm;
2. The property of light penetration is so obvious in the visible light region with the wavelength of 380-780nm;
3. Shielding property is very strong in UV light region at the wavelength of 200-380nm.

In order to reduce the preparation cost and the degree of agglomeration, simplify the process and improve the production efficiency, so that nanosize cesium tungstate powder can be more widely used. A new method for preparing nanosize cesium tungstate powder by using ammonium paratungstate, cesium carbonate and methanol as raw materials is proposed.

Specific steps are as follows:
1. Dissolving ammonium paratungstate and cesium carbonate in methanol solution, drying to get powder;
2. Crushing the powder particles obtained from step 1 to obtain tungsten and cesium powders mixed;
3. Placing the powder obtain in step 2 in a sealed reactor with stirring, adding sorbitol, then heated to 350℃ and stirring for 2~8 hours;
4. Separate the products produced in step 3, and washing with alcohol, then drying, and crushing in the air flow mill to get nanosize cesium tungstate powder.
Remark: The air pressure in the crushing chamber is 0.6MPa~l.IMPa, and the rotor speed is set to 1000 revolutions per minute.

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