Abstract

Natural fluorite crystals containing oxygen impurities are colored electrolytically by using a pointed cathode and a flat anode at various temperatures and voltages. F and F 2 color centers are produced in colored fluorite crystals. O 2−–V a +, O 2−–V a + aggregate, Yb 2+, Ce 3+ and Sm 2+ absorption bands are observed in absorption spectra of uncolored fluorite crystals. O 2−–V a +, O 2−–V a + aggregate, Yb 2+, Ce 3+, Sm 2+, F, M (F 2) absorption bands and group of four absorption bands are observed simultaneously in absorption spectra of colored fluorite crystals. Current−time curve for electrolytic coloration of natural fluorite crystal and its relationship with electrolytic coloration process are given. Production and conversion of color centers are explained.

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