Synthesis and characterization of composite conductive powders prepared by Sb-SnO2-coated coal gasification fine slag porous microbeads

In the present paper, the synthesis of composite conductive powders of coal gasification fine slag porous microbeads (CMs) coated with antimony-doped tin oxide (Sb-SnO2) by chemical deposition was reported. It was found that CMs were coated with well-crystallized and uniform antimony-doped tin oxide nanoparticles (ATCM), and the volume resistivity of ATCM powders reached 2.60 x 10(3) Omega.cm with an average particle size of 18.3 mu m. The effects of calcination temperature and time on the resistivity of ATCM were studied. It was found that the effects of calcination conditions on volume resistivity could be attributed to a coaction of the changes in the valence state and concentration of Sb, the crystal integrity of Sb-SnO2 and the agglomeration degree on the surface. For doping, the extension of calcination time could improve the number of carriers, while the calcination temperature affected the resistivity of ATCM due to surface segregation. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This paper reported the synthesis of composite conductive powders of coal gasification fine slag porous microbeads coated with antimony-doped tin oxide by chemical deposition, and studied the effects of calcination temperature and time on resistivity. It was found that changes in the valence state and concentration of Sb, crystal integrity of Sb-SnO2, and surface agglomeration degree were responsible for the variations in resistivity.