Abstract
Hydroxyl-doped potassium iodide polycrystals were successfully colored electrolytically by using a pointed cathode and a flat anode at various temperatures and electric field strengths, which mainly benefits appropriate coloration temperatures and electric field strengths. Characteristic OH−, O2-–Va+, U, V2, V3, Cu+, Cu-related, I2-, I2, K, F, R1 and R2 spectral bands were observed in Kubelka–Munk functions of the colored polycrystals, and the OH− and O2-–Va+ spectral bands at room temperature were determined from Mollwo–Ivey plots. Color center formation in the electrolytic coloration was explained.
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