Abstract
Silver powder and silver-tin oxide composite powder were synthesized by hydrothermal method. The powders were characterized by XRD and SEM. The results show that there are macroscopic appearance and microscopic structure differences between two kinds of powders. Silver powder is gray and spherical particles with 3μm diameter, and silver-tin oxide composite powder is black ash and mainly flake particles about 0.3μm in thickness. Silver crystal in silver tin-oxide composite powder is preferentially oriented in the (111) crystal plane and its oriented index is 2.581. However oriented index of silver crystal in silver powder is 1.048 which shows the crystal isn’t preferentially oriented in the (111) crystal plane. That crystal lattice parameter of silver crystal in silver tin oxide composite powder is 0.409 34 nm larger than 0.408 68 nm of silver powder. The mechanism analysis shows that the hydrogen bonds among Sn(OH)62- and Ag(SO3)23- complexes are inhere factor which result in the formation of flake silver tin-oxide composite powder.
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