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VOLUME 38 (1983) | ISSUE 7 | PAGE 326
Circular dichroism in the region of state produced due to vacancies in sillenite-type crystals
The gyrotropy of pure and doped sillenite crystals (Bi12SiO20, Bi12GeO20, and Bi12TiO20) was investigated. It was found that silicon, germanium, and titanium vacancies contribute significantly to circular dichroism. This contribution disappears upon doping with aluminum, which is associated with filling of vacancies.