Optical Properties of MgAl2O4 Crystals Grown by Iridium-Free Technology |
| S. Nizhankovskyi, A. Kozlovskyi, O. Vovk, N.S. Sidelnikova, Yu.V., O. Vovk, N.S. Sidelnikova, Yu.V. Siryk
Institute for Single Crystals, STC ``Institute for Single Crystals'', National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine |
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| It was carried out the investigation of optical absorption of magnesium-aluminum spinel (MgAl2O4) crystals. The crystals were grown by horizontal directional crystallization method in molybdenum crucible under the protective atmosphere Ar+(CO, H2). The optical absorption spectra of MgAl2O4 crystals exhibit absorption bands (267 and 325 nm) caused by complexes of defects formed by oxygen vacancies and cations located in anti-sites. It is shown that annealing of crystals in an oxidizing environment at T=1500° leads to the elimination of these absorption bands and the improvement of the optical properties of the grown crystals. |
DOI:10.12693/APhysPolA.141.371 topics: magnesium-aluminum spinel, horizontal directional crystallization method, molybdenum, optical absorption |