Nanocrystalline SnO2 of different sizes were prepared by the reverse dropping precipita?tion method using ethynol as the dispersive and protective reagent. XRD patterns showed that the syn?thesized SnO2 was amorphous when calcination temperature was below 200°C; but when calcination temperature reached the range of 400 ?800 cC,the prepared SnO2 was nanocrystalline with single?phase ,and was tetragonal in structure with space group P4/mnm. TEM photos revealed that the SnO2 nanoparticles were spherical m shape,and the mean sizes of SnO2 particles increased with the in?crease of calcination temperature. Weight loss analysis indicated that the weight loss of precursor mainly depended on the calcination temperature,but little depended on the calcination time. Measure?ment of relative density showed that the relative density of SnO2 nanocrystalline powder increased with the increase in SnO2 crystal sizes.
Key words
Sn /
SnO2 /
Nanocrystal /
Precipitation method
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Footnotes
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