Preparation of Spherical Calcium Tungstate Mircocrystals by Precipitation

Spherical calcium tungstate microcrystals were prepared with heat treatment at 100 ℃ and using a calcium tungstate muddy solution by precipitation with natrium tungstate and calcium nitrate as starting materials, and with cetyltrimethyl ammonium bromide as a surfactant. The spherical calcium tungstate microcrystals were characterized by X-ray diffraction and transmission elec-tron microscopy. The results indicate that the crystallites of the calcium tungstate samples are excellent, and the diameters of the calcium tungstate microcrystals with outstanding spherical morphology are 2.1-3.2 μm, and the particles are well dispersed and not aggregated. Cetyltrimethyl ammonium bromide plays an important role in the formation of spherical calcium tungstate microcrystals. When excited at 265 nm, the luminescence of calcium tungstate microcrystals exhibits a luminous peak in the blue band. The luminescent intensity of spherical calcium tungstate microcrystals is about two times greater than that of the aggregate particles.

 

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

• < Prev
• Next >