Выпуск 2021 годаhttp://repository.enu.kz/handle/enu/107962026-04-04T06:11:38Z2026-04-04T06:11:38ZMagnetic anisotropy and stability of Fe3Ga compoundsInerbaev, T.M.Abuova, A.U.Dauletbekova, A.K.Abuova, F.U.Kaptagay, G.A.Zakieva, Zh.Eltizarova, M.Barakov, A.http://repository.enu.kz/handle/enu/108702025-06-13T20:27:50Z2021-01-01T00:00:00ZMagnetic anisotropy and stability of Fe3Ga compounds
Inerbaev, T.M.; Abuova, A.U.; Dauletbekova, A.K.; Abuova, F.U.; Kaptagay, G.A.; Zakieva, Zh.; Eltizarova, M.; Barakov, A.
The magnetic anisotropy energy and the stability of crystal modifications of D03 and L21 of Fe3Ga
compounds are studied with the density functional theory methods. The magnetic anisotropy energy
of the D03 structure is more than twice the same value for the L21 structure. The features in the
electronic structure lead to the difference in the magnitude of spin-orbit interaction, explaining the
found effect. The L21 structure is more thermodynamically stable in the entire range of the considered
pressures. Under pressure, the considered crystal modifications of Fe3Ga lose their stability due to the
appearance of imaginary frequencies in their phonon spectra.
2021-01-01T00:00:00ZApplication of non-destructive neutron resonance capture analysis for investigation of women’s Old Believer cross dating back to the second half of the 17th centuryMazhen, S.T.Sedyshev, P.V.Simbirtseva, N.V.Yergashov, A.M.Dmitriev, A.Yu.Ivchenkov, V.L.http://repository.enu.kz/handle/enu/108692025-06-14T04:40:42Z2021-01-01T00:00:00ZApplication of non-destructive neutron resonance capture analysis for investigation of women’s Old Believer cross dating back to the second half of the 17th century
Mazhen, S.T.; Sedyshev, P.V.; Simbirtseva, N.V.; Yergashov, A.M.; Dmitriev, A.Yu.; Ivchenkov, V.L.
Neutron Resonance Capture Analysis (NRCA) is presently being developed at the Frank Laboratory
of Neutron Physics (FLNP) to determine the elemental composition of samples. The NRCA is a nondestructive method that allows measuring objects’ bulk composition. The procedure is based on detecting neutron resonances in radiative capture and the measurement of the yield of reaction products
in these resonances. The experiments are carried out at the Intense REsonance Neutron source (IREN).
In this study, we applied the NRCA to investigate an archaeological object provided by the Museum
and Exhibition Complex (MVK) "Volokolamsk Kremlin". The object was a women’s Old Believer cross
(second half of the 17th century) found in the Moscow region, Volokolamsk district, the village of
Chubarovo.
2021-01-01T00:00:00ZA comparative study of promising filter materials for neutron imaging facilitiesNazarov, K.M.Kichanov, S.E.Lukin, E.V.Zel, I.Yu.Kozlenko, D.P.Zholdybayev, T.K.Muhametuly, B.Kenessarin, M.Rutkauskas, A.V.Yskakov, A.Belova, M.O.http://repository.enu.kz/handle/enu/108682025-06-14T13:01:33Z2021-01-01T00:00:00ZA comparative study of promising filter materials for neutron imaging facilities
Nazarov, K.M.; Kichanov, S.E.; Lukin, E.V.; Zel, I.Yu.; Kozlenko, D.P.; Zholdybayev, T.K.; Muhametuly, B.; Kenessarin, M.; Rutkauskas, A.V.; Yskakov, A.; Belova, M.O.
The effect of sapphire and bismuth single-crystal filters and their combinations on the quality of neutron
radiographic images and neutron tomography data has been studied. The parameters of the contrast
of the neutron image were analyzed depending on the monocrystalline filters. Neutron transmission
spectra were obtained for sapphire and bismuth single crystals. Additionally, the effect of filters on
the overall intensity of the thermal neutron beam and the background of gamma-rays was investigated.
Based on the obtained data, we assume that a single-crystal sapphire filter can be most effectively used
for radiographic and tomographic installations using thermal neutrons.
2021-01-01T00:00:00ZMechanisms for the creation of intrinsic electron-hole trapping centers in a CaSO4 crystallNurakhmetov, T.N.Zhangylyssov, K.B.Zhunusbekov, A.M.Daurenbekov, D.H.Alibay, T.T.Sadykova, B.M.Yussupbekova, B.N.Tolekov, D.A.http://repository.enu.kz/handle/enu/108672025-06-14T14:19:32Z2021-01-01T00:00:00ZMechanisms for the creation of intrinsic electron-hole trapping centers in a CaSO4 crystall
Nurakhmetov, T.N.; Zhangylyssov, K.B.; Zhunusbekov, A.M.; Daurenbekov, D.H.; Alibay, T.T.; Sadykova, B.M.; Yussupbekova, B.N.; Tolekov, D.A.
The mechanism of creation of electron-hole trapping centers in CaSO4 at 15-300 K was investigated by
the methods of vacuum-ultraviolet and thermoactivation spectroscopy. It is shown that electron-hole
trapping centers are formed upon trap of electrons in the anionic complexes SO2−
4
and localization
of holes in the form of SO−4 radical. Based on the measurement of the spectrum of excitation of
long-wavelength recombination emission at 3.0-3.1 eV and 2.7 eV, the energy distance of the formed
electron-hole trapping centers was estimated (4.43 eV and 3.87 eV).
2021-01-01T00:00:00Z