Crystallization of Silver Chromate from Ethanol Via Salt Metathesis Reactions of Solubilized Precursors
Technical rept. 1 Jun-31 Aug 1993
OREGON UNIV EUGENE DEPT OF CHEMISTRY
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Admixture of aqueous solutions of silver nitrate and potassium chromate results in immediate precipitation of silver chromate as a red-brown microcrystalline powder, while addition of aqueous silver nitrate solution to a solution of potassium chromate18-crown-6 in ethanol gives a bright-red precipitate. X-ray powder diffraction shows both materials to be orthorhombic silver chromate. The ethanol-derived sample displays broader diffraction peaks, suggesting smaller crystallite size. Scanning electron microscopy confirms this. The ethanol-derived sample appears amorphous, while the aqueous sample displays well-faceted crystallites approximately 0.5 - 1 micron in size. Nonaqueous crystallization, Complexation-mediated crystallization.
- Inorganic Chemistry
- Physical Chemistry
- Electricity and Magnetism