A convenient thermal decomposition-co-reduction synthesis of nanocrystalline tungsten disilicide

[摘要] Nanocrystalline WSi₂ was synthesized by a thermal decomposition-co-reduction route via the reaction of anhydrous tungsten hexachloride and sodium fluorosilicate with metallic potassium in an autoclave at 650°C. X-ray powder diffraction pattern indicated that it was tetragonal WSi₂. Transmission electron microscope image showed that it consisted of particles with an average diameter of about 50 nm. TGA and DTA indicated that it had good thermal stability below 600°C in air.

[学科分类] 材料工程

[关键词] Nanostructures;tungsten disilicide;chemical synthesis;X-ray diffraction;thermal analysis.