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The nature of luminescence of KI and KI-Na crystals at low temperature deformation after natural decrease in the symmetry of the lattice

Number 3_Vol.2

AUTHORS: K. Shunkeyev, N. Zhanturina, L. Myasnikova, D. Sergeyev, Z. Aimaganbetova, Sh. Sagimbaeva, A. Barmina, Zh. Ubaev

DOI: 10.29317/ejpfm.2018020308

PAGES: 267 - 273

DATE: 2018-09-26


ABSTRACT

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 ( p ) and 4.1 eV ( s ) become equal in com-
parison 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 prac-
tically merges with s -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( p ) → 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.


KEYWORDS

Ex -radiation, low temperature uniaxial deformation, KI, KI-Na, X-ray luminescence.


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