DOI: https://doi.org/10.30970/jps.03.513
REORIENTATION AND THERMODISSOCIATION OF IMPURITY-VACANCY COMPLEXES IN SrCl2–Me+ CRYSTALS
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Journal of Physical Studies 3(4), 513–518 (1999)
DOI: https://doi.org/10.30970/jps.03.513 REORIENTATION AND THERMODISSOCIATION OF IMPURITY-VACANCY COMPLEXES IN SrCl2–Me+ CRYSTALS |
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Z. P. Chorniy
Ukrainian State University of Forestry and Wood Technology
103 Gen. Chuprynka Str., Lviv, UA-79057, Ukraine
The reorientation and thermodecoloration of $M_{\rm{A}}^+$–centres in SrCl$_2$–$Me^+$ have been studied. The temperature and energy of the $M_{\rm{A}}^+$–centre reorientation depend on the size of an alkali ion (130 K and 0.29 eV in SrCl$_2$–Li$^+$, 145 K and 0.34 eV in SrCl$_2$–Na$^+$, 125 K and 0.28 eV in SrCl$_2$–K$^+$, 117 K and 0.25 eV in SrCl$_2$–Rb$^+$, 110 K and 0.23 eV in SrCl$_2$–Cs$^+$) which is caused by the local disturbances of a lattice in the impurity domain. Thermodecoloration of the $M_{\rm{A}}^+$–absorption bands in SrCl$_2$ crystals by the alloyed K$^+$,Rb$^+$,Cs$^+$ ions is taking place due to the recombination of mobile holes in the $M_{\rm{A}}^+$–centres and in the crystals alloyed with the Li$^+$ and Na$^+$ ions due to the splitting–off of the $F$–centre from the impurity–vacancy dipole.