Abstract
Abstract The optical activity changes in Bi 12 SiO 20 (BSO) crystals induced by thermal annealing treatments are studied. It is found that the annealing in vacuum and hydrogen atmosphere causes decreasing of the optical rotation. Thermal treatment annealing induces reduction of Bi-ions to metallic bismuth on the surface as well as oxygen and bismuth diffusion and evaporation is supposed. Annealing in oxygen leads to partial recovery of the oxygen content in the crystals and the optical activity values tends to approach the level of un-annealed BSO crystal.
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