Abstract
Air-grown sodium fluoride crystals were colored electrolytically by using a pointed cathode at various temperatures and electric field strengths, which should mainly benefit appropriate coloration temperatures and electric field strengths. O 2 - , F, M, N 1, N 2 color centers and O 2−–F + complexes were produced in the colored crystals. Current–time curves for the electrolytic colorations were given, and activation energy for the V color center migration was determined. The formation of the color centers was explained.
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