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Optical Spectroscopy of Disordered Langasites Doped with Transition Metal Ions

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Inorganic Materials Aims and scope

Abstract

In this review, we present analysis of absorption and circular dichroism spectra of disordered langasite crystals with the calcium gallium germanate structure, whose structures have no screw axis. We consider results of original research concerned with spectroscopic characteristics of undoped and transition metal-doped langasite crystals. Structural disordering on a site leads to charge disbalance on this site and defect formation. Electron transitions to “defect” states contribute to both absorption and circular dichroism spectra. In this situation, a transition metal ion can be incorporated into a “defect” site in different oxidation states, depending on the type of position and the impurity ion. It has been shown that electric dipole forbidden but magnetic dipole allowed electron transitions of impurity ions of d-block elements have the highest intensity in the circular dichroism spectra of doped crystals.

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  1. Moscow Institute of Physics and Technology, Institutskii per. 9, 141701, Dolgoprudnyi, Moscow oblast, Russia

    V. I. Burkov & L. N. Alyabyeva

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  1. V. I. Burkov
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  2. L. N. Alyabyeva
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Burkov, V.I., Alyabyeva, L.N. Optical Spectroscopy of Disordered Langasites Doped with Transition Metal Ions. Inorg Mater 56, 663–682 (2020). https://doi.org/10.1134/S0020168520070031

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