The cryostat for deformation of crystals at low temperatures

Shunkeyev, K.; Sarmukhanov, E. T.; Bekeshev, A. Z.; Sagimbaeva, Sh.; Bizhanova, K.

doi:10.1088/1742-6596/400/5/052032

Cited by 14 publications

(5 citation statements)

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“…The boundary of elastic and plastic deformation is determined experimentally by the linear section of the dependence of the intensity of σ -and E xluminescence on the degree of deformation at which Hooke's law is valid [16]. In this regard, to create only the elastic part of the deformation, the crystals were deformed at low temperature (85 K) within the range of ε = 0.8 − 1.0% in a special cryostat under high technical vacuum conditions [19].…”

Section: Resultsmentioning

confidence: 99%

“…The multifunctional spectral complex performs scanning of X-ray luminescence, tunnel luminescence (TL) and thermostimulated luminescence spectra (TSL), as well as integrated scanning of TL and TSL crystals using a high-power monochromator MSD-2 and a photoelectronic multiplier of H 8259 type of the company "Hamamatsu", operating in the photon counting mode, controlled by special programs SpectraScan and ThermoScan in a wide spectrum range of 200 ÷ 850 nm and temperatures of 85 ÷ 400 K under the influence of uniaxial deformation ( ε = 0.1 − 1.2% ) under high technical vacuum conditions [19].…”

Section: Experimental Technique and Research Objectsmentioning

confidence: 99%

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The features of deformation-stimulated RbI luminescence

Myasnikova

Maratova

Shunkeyev

2021

Eurasian j. phys. funct. mater.

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This paper studies deformation-stimulated features of radiative relaxation of self-trapped excitons and recombination assembly of exciton-like luminescence in RbI crystal. Methods of research were luminescence and thermal activation spectroscopy. The identity of the mechanism of manifestation of the X-ray luminescence, tunnel luminescence and thermally stimulated luminescence spectra were found in the elastically deformed RbI crystal, interpreted by the luminescence of self-trapped exciton, tunnel recharge of F′, VK -pairs and thermally stimulated recombination of e−, VK -centres, respectively.The temperatures of the maximum destruction peaks of thermally stimulated luminescence, their spectral composition and activation energies were determined experimentally, on the basis of which the mechanisms of recombination assembly of exciton-like luminescences in a RbI crystal were interpreted. Uniaxial elastic deformation leads to the effective formation of point radiation defects ( F′, HA, VK -centers) in comparison with an unbroken lattice, where the predominant mechanism is the association of interstitial atoms ( H -centres) with the formation of I3−-centres.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Technique and Research Objectsmentioning

confidence: 99%

The features of deformation-stimulated RbI luminescence

Myasnikova

Maratova

Shunkeyev

2021

Eurasian j. phys. funct. mater.

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“…The experimental setup allows scanning in a range of 200-850 nm the spectra of XRL and thermally stimulated luminescence (TSL), as well as measuring of the integral TSL curves of the crystals subjected to the elastic uniaxial deformation at 90 K. The measurements were carried out using an MSD-2 high-aperture monochromator with an H 8259 photomultiplier (Hamamatsu) operating in the photon counting mode and controlled by special programs SpectraScan and ThermoScan. Lowtemperature deformation and recording of the luminescence characteristics of the crystals were carried out using a special cryostat equipped with appropriate windows [39].…”

Section: Methodsmentioning

confidence: 99%

Radiation defects in NaCl matrix with reduced lattice symmetry caused by light cation doping and elastic uniaxial deformation

Shunkeyev¹,

Ubaev²,

Lushchik³

et al. 2021

physics

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The processes of radiation defect creation and radiative relaxation of electronic excitations under applied local or/and uniaxial elastic deformation have been studied in NaCl crystals by means of optical absorption, luminescence and thermoactivation spectroscopy methods. In NaCl:Li at 80 K, X-ray-induced absorption bands peaked around 3.35 and 4.6 eV have been detected and ascribed to interstitial halide atoms located nearby Li impurity cations, HA(Li) centres. Subsequent thermal annealing of HA(Li) centres leads to the formation of polyhalide centres responsible for the absorption band at 5.35 eV. In an X-irradiated and stressed NaCl:Li crystal (degree of uniaxial elastic deformation of ε = 0.9%), the peak of thermally stimulated luminescence at ~115 K is composed of the ~2.7-eV emission appearing, in our opinion, due to the recombination of the electron, thermally released from an F′ centre, with a hole-type HA(Li) centre. The applied uniaxial elastic stress facilitates the self-trapping of anion excitons in regular regions of a NaCl lattice and impedes the energy transfer by mobile excitons to impurities/defects and, in turn, attenuates the Br-related luminescence peaked at 3.95 eV with respect to the π-emission of self-trapped excitons (~3.35 eV). The 3.95 eV emission has been detected in a natural NaCl crystal containing homologous Br impurity ions.

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“…Uniaxial deformation (ε = 0.8 ÷ 0.9%) of crystals was carried out along <100> and <110> crystallographic directions in a special cryostat at low temperatures (85 K) under conditions of high technical vacuum (10 −6 ) Torr [29].…”

Section: Objects Of Research and Technique Of Experimentsmentioning

confidence: 99%

Exciton-like luminescence of KCl matrix under thermoelastic, local and uniaxial deformation

Shunkeyev

Tilep

Lushchik

et al. 2022

Eurasian j. phys. funct. mater.

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The radiative relaxation of exciton-like formations in KCl-Na single crystal has been studied by experimental methods of luminescent spectroscopy. The amplifying effect of the radiation intensity with a maximum at 2.8 eV up to 500 times as compared to pure KCl has been detected in KCl-Na. The luminescence efficiency of an exciton-like formation increases with rise in: sodium ions concentration ( 10 ÷ 1000 ppm), thermal exposure ( 500 • C ÷ 600 • C ) and the degree of uniaxial deformation along <100> and <110> crystallographic directions. Previously, such a scale of the luminescence enhancement effect has not been registered in KCl matrix at room temperature. At high sodium concentrations (1000 ppm) in KCl-Na crystals, the additional intense emission with a maximum at 3.1 eV has also been revealed, which is typical for pair sodium ions. It is interpreted that the exciton-like formation in the sodium field with the maximum quantum yield of luminescence is formed by recombination assembly of electron-hole pairs due to the mobility of unrelaxed holes.

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The cryostat for deformation of crystals at low temperatures

Cited by 14 publications

References 0 publications

The features of deformation-stimulated RbI luminescence

The features of deformation-stimulated RbI luminescence

Radiation defects in NaCl matrix with reduced lattice symmetry caused by light cation doping and elastic uniaxial deformation

Exciton-like luminescence of KCl matrix under thermoelastic, local and uniaxial deformation

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