Abstract: Tin dioxide ultrafine powders used as transparent conductive films and conductive paints have extensive
application prospects. Antimony-doped tin dioxide ultrafine powders in size of nanometers were prepared by chemical coprecipitation by using SnCl₄·5H₂O
and SbCl₃ as precursors with the doped concentration of Sb₂O₃:SnO₂ =9:100(weight rate). The characteristics of the powders were investigated by
differential scanning calorimetry and thermogravimetric analysis (DSC-TG), X-ray diffraction (XRD), transmission electron microscope (TEM) and ultraviolet
spectrum analysis (UV). The influences of heating temperature and heating time on the particle size and powders resistance were researched. The reason of the
powders emerging light blue was also derived.

Key words: conductive nanometer-sized antimony-doped SnO₂ powders, heat-treatment, properties of antimony-doped SnO₂ powders