Circular dichroism spectra of langasite family crystals in the range of electronic transitions of structure defects |
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| Authors: | V. I. Burkov E. P. Peredereĭ E. V. Fedotov B. V. Mill’ Yu. V. Pisarevskiĭ |
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| Affiliation: | (1) Moscow Institute of Physics and Technology, Institutskiĭ per. 9, Dolgoprudnyi, Moscow oblast, 141700, Russia;(2) Moscow State University, Moscow, Russia;(3) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia |
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| Abstract: | The absorption and circular dichroism spectra of langasite family crystals are studied. Wide bands in the range of 285–500 nm that are related to the structure lattice defects are found. For all the crystals, these bands are in approximately the same spectral region, have identical structures, and can be attributed to one type of defects formed by cation vacancies and excess oxygen atoms in the optically active positions. |
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