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Eurasian Journal of Physics and Functional Materials

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Vol 5, No 1 (2021)
6-14 241
Abstract

Since 2019, the TITAN neutron radiography and tomography facility have been operating at the WWR-K research reactor. The experimental station is intended for a wide range of applications in various fields of science. Since the launch, several interesting works have been carried out to study the internal features of lithium-ion batteries and geophysical materials. The spatial resolution of the detector system was sufficient to visualize the internal elements of the lithium battery and to separate individual grains of thepyrite mineral in the rock sample. This paper presents the technical parameters of the experimental setup and the results of the recent applied research.

15-23 167
Abstract

A study of the reaction of inelastic scattering of 14.1 MeV neutrons by 23 Na nuclei was carried out at the TANGRA facility using the tagged neutron method. In this work, the energies of visible . transitions are determined, the yields of . -quanta are obtained, the angular distributions of . -quanta for 23 Na are measured. The results obtained are in good agreement with the data of other published experimental works.

24-30 140
Abstract

The mechanisms of creation of electron-hole trapping centers in LiKSO4 have been investigated by the methods of vacuum and thermal activation spectroscopy. It is shown that electron-hole trapping centers are formed during the trappingof electronsbyanionic complexes and localizationofa holein the lattice in the form of the radical SO. . The appearance of phosphorescence at 3.0-3.1 eV, 2.6-2.7 eV and 2.3-2.4 4 eV confirms the creation of electron-hole trap centers.

31-38 146
Abstract

The nature of the impurity emission center and the energy transfer mechanisms from intrinsic electronic excitations to the Mn2+ impurity centers in the CaSO4 . Mn crystal have been investigated. The methods of vacuum ultraviolet, atomic absorption and luminescence spectroscopy are used in a wide temperature range from 5 K to 300 K. The energy transfer of intrinsic electronic excitations to impurity emission centers in CaSO4 . Mn has been detected.

39-44 162
Abstract

The article presents the study results of detonation spraying parameters on the phase composition and tribological properties of NiCr-Al 2 O 3 powder coatings. The spraying was carried out at a ratio of the acetylene oxygen mixture O 2 /C 2 H2 =1.856. The detonation barrel filling volume with an explosive gas mixture varied from 30% to 68%. It is determined that the phase composition of the NiCr-Al 2 O 3 coatings varies depending on the degree of detonation barrel filling. With an increase in the detonation barrels filling volume, the intensity of the NiCr diffraction peaks is decreased, and the intensity of the . -Al 2 O 3 reflexes is increased, which indicates an increase in the content of the Al 2 O 3 phase. When low filling volume, there is determined a low coating density and uneven roughness. The tribological test results showed that with an increase in the detonation barrel filling volume, there is a decrease in the wear volume, which confirms the increase in the coatings wear resistance. Determined that the lowest friction coefficient was recorded in the sample obtained at the barrel filling volume 68%. The coatings high wear resistance is associated with an increase in the alpha phase volume fraction of . -Al 2 O 3 and coatings density.

45-51 159
Abstract

In this study, the research results of the influence of pulsed plasma treatment on phase composition, hardness, and roughness of Cr 3 C 2 -NiCr coatings are presented. The Cr 3 C2 -NiCr coating was applied to substrate 12Kh18N10T stainless steel by detonation spraying method. To change the physical and mechanical properties of sprayed coating's surface layers, subsequent pulse plasma treatment was used. The pulse plasma treatment leads to changing the roughness of Cr 3 C2 -NiCr coating. The results of mechanical tests showed that after pulsed plasma treatment, the hardness of Cr 3 C 2 -NiCr coating is increased. Based on X-ray diffraction analysis, it was found that the hardness increasing of coating is associated with phase transformations on the surface layer, in particular, the formation of the oxide phase and an increase in the number of carbide particles.

52-63 152
Abstract

The Stepnogorsk area Northern Kazakhstan has a long historymining activities. Mining activities have lots of environmental and health impacts. The aims of this study were to characterizing the general radiological situation of the area and evaluate radiation exposure by scenarios in settlements. In this study radiological assessment was performed for critical group living in the territory contaminated with radionuclides; working and studying at school located on territoryformer mining site. The annual dose burden is 2.5 mSv y .1 in Zavodskoy, 1.9 mSv y .1 in Kvartsitka and 3.6 mSv y .1 in Aqsu; and exposure from radon is around 11 mSv y .1 at the ground floor, and for teachers -up to 12 mSv y.1 . At settlements, however, under the hypothesis that all food contaminated with radionuclides and vegetables is cultivated locally in the territories with high background level, exposure from ingestion is 9.1 mSvy .1 in Zavodskoy, 8.3 mSv y .1 in Kvartsitka and 11.5 mSv y .1 in Aqsu. The combined effects of environmental problems have culminated into health problems. There are such possibility of the higher prevalence of cardiovascular, digestive and respiratory systems so it is necessary to evaluate or protect people living in Stepnogorsk area.



ISSN 2522-9869 (Print)
ISSN 2616-8537 (Online)