Preparation of silver particles by spray pyrolysis of silver-diammine complex solutions
N. Kieda, G.L. Messing
(The Pennsylvania State University)
A novel precursor solution system, containing NH₃ as a complexing agent, was used for the production of Ag powders by spray pyrolysis. Solutions of Ag₂CO₃, Ag₂O, and AgNO₃ with NH₄HCO₃ were used in this study. Ag powders were obtained at unexpectedly low temperatures, i.e. 400¡C or less. The Ag powders with a shell-like morphology were obtained from Ag₂CO₃ and Ag₂O solutions, whereas dense Ag particles of about 1 <>mm diameter were obtained from AgNO₃-NH₄HCO₃ solution. These morphologies are explained in terms of NH₃ release during spray pyrolysis.
Keywords: metals; powder; spray pyrolysis
Order No.: JA806-031 © 1998 MRS

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