Abstract
It is shown using Bi12TiO20 as an example that doping of a sillenite phase leads to the formation of a solid solution between it and the Bi12M x O20 ± δ phase corresponding to the dopant. This gives rise to structural features characteristic of the second phase and, accordingly, results in the formation of the corresponding optical centers. Dopant atoms occupy tetrahedral (M) sites. In addition, in the case of heterovalent substitutions the M site is partially occupied by the Bi atoms of [BiO3] groups. The structural features of sillenites are governed by the oxidation state of the M cation. Accordingly, doping with ions in the same oxidation state leads to the formation of similar optical centers and, as a consequence, produces similar changes in the properties of the material. The results obtained are supported by experimental studies of the absorption, circular dichroism, photoinduced absorption, and photoconductivity spectra of doped sillenite crystals in a wide spectral range.
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