Solvent thermal process has been successfully applied to prepare nanocrysta
lline CdS via the reaction CdSO4 with Na2S3 in benzene at 80-120 degrees C.
If was found that solvent, temperature, and reactant have significant effe
ct on crystal structure anal particle size of CdS nanocrystalline. The resu
lts show that increasing of temperature and using of solvent of low dielect
ric constant are beneficial to prepare CdS nanocrystalline in hexagonal pha
se. The water content in the system not only induces the presence of cubic
phase CdS nanocrystalline, but also leads to a particle size increase. The
results demonstrate that both phase and particle size can be well controlle
d. As-prepared CdS nanocrystalline powders display obvious blue-shift chara
cteristics. (C)1999 Acta Metallurgica Inc.