Abstract
1. Very fine metallic silver powders were produced by the chemical reduction technique, using divalent iron sulfate, hydrazine hydrate, and hydroxylamine as reducing agents. 2. A study was made of the effects of starting solution concentrations and temperature upon the particle size of the resultant silver powder and also of the effects of various methods of preparation and particle size upon the purity of the final product. The purest (99.7–99.85%) and finest (0.2–0.6μ) silver powders are obtained when an ammoniacal solution of silver nitrate is reduced with hydrazine hydrate in the presence of tartaric acid. 3. The specific surfaces of silver powders with mean particle sizes of 1.5 ± 0.3 and 0.4 ± 0.2μ were determined by the method of low-temperature krypton adsorption and found to be 0.25 ± 0.05 and 1.0 ± 0.2 m2/g, respectively.
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