The nature of luminescence of KI and KI-Na crystals at low temperature deformation after natural decrease in the symmetry of the lattice
| Autor: | K. Shunkeyev, A. Barmina, N. Zhanturina, Zh. Ubaev, L. Myasnikova, D. M. Sergeyev, Sh. Sagimbaeva, Z. Aimaganbetova |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Radiation Materials science KI Physics and Astronomy (miscellaneous) Condensed matter physics Materials Science (miscellaneous) X-ray luminescence KI-Na Condensed Matter Physics lcsh:QC1-999 Ex -radiation Lattice (order) Luminescence lcsh:Physics low temperature uniaxial deformation |
| Zdroj: | Eurasian Journal of Physics and Functional Materials, Vol 2, Iss 3, Pp 267-273 (2018) |
| ISSN: | 2616-8537 2522-9869 |
| Popis: | The X-ray luminescence spectra at low temperature (90K) uniaxial deformation were researched for KI and KI-Na crystals, that were stored for more than 10 years. The following regularities were observed: firstly, the intensities of the intrinsic emission bands at 3.3 eV ( π ) and 4.1 eV ( σ ) become equal in comparison with freshly grown crystals; and secondly, with an increase in the degree of low-temperature uniaxial deformation, a gradual shift of the emission spectra occurs in two directions: the luminescence maximum at 3.3 eV shifts towards short wavelengths, the final position is fixed at 3.9 eV, which practically merges with σ -luminescence; the radiation maximum at 3.0 eV (Ex-radiation) is shifted toward long wavelengths, the final position which is fixed at 2.8 eV. Thus, low temperature uniaxial deformation leads to the separation of the emission spectra at 3,3 eV( π ) → 3,9 eV and 3.0 eV ( Ex ) → 2,8 eV, which are interpreted by the separation of weak → on and weak → strong exciton configurations , respectively |
| Databáze: | OpenAIRE |
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