Abstract
Ammonium alum crystals are colored electrolytically using a pointed cathode and a flat anode at low temperatures and under various voltages. SO3−, SO2− and O3− hole-trapped centers are produced in colored ammonium alum crystals. Characteristic absorption bands of SO3−, SO2− and O3− hole-trapped centers are observed in absorption spectra of colored ammonium alum crystals. Production and conversion of hole-trapped centers are explained. Current–time curves for electrolytic coloration of ammonium alum crystal and their relationship with electrolytic coloration process are given.
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