Eurasian Journal of Physics and Functional Materials

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Vol 6, No 1 (2022)
6-17 202

The capture cross section, the fusion cross section, and the quasi-fission yield producing symmetric fragments ( ACN/2 ± 20u ) in the 48 Ca+ 238 U reaction are analyzed by the multidimensional Langevin equation taking account of the surface friction effect. From the experimental data, the strength of the tangential friction has been determined. It is presented that tangential friction increases in proportional to the power of the relative velocity of the projectile and the target.

18-31 430

A new algorithm for the analog spectrometer of the DGFRS-2 setup installed at DC-280 cyclotron is presented. The main goal of application of this algorithm is to search an optimal time correlation recoilalpha parameter directly during the acquisition C++ code execution. A new real-time flexible algorithm in addition to the conventional ER − a algorithm, which has been used for a several years at the DGFRS-1 setup installed at the U-400 FLNR cyclotron, is presented. The main parts of the spectrometer are a 48×128 strip DSSD detector (Double Side Strip Detector) and a low-pressure gaseous detector. They are presented schematically. Nuclear reactions for synthesis of element Z=119 at the DGFRS-2 are under consideration. Some attention is paid to computer simulation of the heavy recoil spectra, taking into account its pulse height defect in silicon. First beam test results are also presented. A new formula for half-life time using recent data for superheavy nuclei is obtained.

32-37 156

The results of calculations of the Landau level and cyclotron mass in strong magnetic fields in an InAs quantum well based on the two-band model are presented. The calculations were performed in the
approximation of infinity of the depth of the quantum well, taking into account the Landau level of the second subband. It is shown that taking into account the cyclotron transition of electrons within the second subband satisfactorily describes the experimental data obtained in strong magnetic fields in the InAs/In0.81Ga0.19As/InxAl1−xAs heterostructure.

38-46 133

Nowadays, the WWR-K research reactor is operated with low-enriched uranium fuel and a beryllium neutron reflector. Irradiation positions located in the core make it possible to irradiate objects no larger than 50 mm in size. In the reactor tank, behind the beryllium reflector, there are irradiation positions with a diameter of 200 mm, but in them, in comparison with irradiation positions in the core, the neutron intensity is lower. This motivated us to carry out computational studies on the generation of a large diameter neutron trap in the center of the WWR-K reactor core. The paper presents the results of neutron-physical calculations on the generation of a neutron trap in the center of the WWR-K reactor core. The generation of a large diameter neutron trap in the core of the WWR-K reactor will make it possible to carry out radiation tests of large objects. For this, it is necessary to change the layout of the core. The influence of the transformation of the core on the experimental characteristics of the WWR-K reactor is shown.

47-55 124

This paper compares the structure and properties of homogeneous and gradient coatings in the Ni-Cr-Al system obtained by detonation spraying. According to X-ray analysis, only the CrNi3 phase appears in the homogeneous coating, and CrNi3 , Al, and NiAl phases appear on the gradient coating. The elements distribution graphs show that a small amount of aluminum is distributed over the depth of the homogeneous coating and in the gradient coating. The distribution of aluminum in the gradient Ni-Cr-Al coating gradually increases from the depth to the surface, and a high amount of aluminum forms in the coating surface. According to EDS analysis, a small amount of aluminium is distributed on the surface of the homogeneous coating and a large amount on the gradient coating. In the gradient coating, aluminium gradually increases from the substrate surface to the coating surface. Also, the gradient coating has a higher hardness than the homogeneous coating.

56-70 188

The structural features of ancient ceramic fragments dating from various historical ages of ancient cultural groups inhabiting the territory of modern Kazakhstan were studied using optical microscopy, neutron diffraction, neutron tomography, and Raman spectroscopy methods. Fragments of ancient pottery were selected from the collection of ancient remains from archaeological excavations near Zaysan district of East Kazakhstan region, Republic of Kazakhstan. The phase analysis of the studied ceramics fragments was performed. Phases of feldspar, quartz and mica as additional additives for the manufacture of ancient pottery were observed. Minor phases of graphite, anatase, and calcite were detected. Structural
features and spatial distribution of components inside the volume of ceramic fragments were studied. In some pottery fragments, organic additives, possibly of vegetable origin, were found. According to the obtained structural data, the specific features of ceramic manufacturing, as well as the processes of
temperature annealing of pottery pieces are discussed.

71-84 187

Superionic semiconductor chalcogenides with mixed electronic-ionic conductivity have very low lattice thermal conductivity and are excellent thermoelectrics. Doping with other elements is one of the methods for optimizing the useful properties of a material. In this work, nanosized polycrystalline alloys of nonstoichiometric Cu1.85S copper sulfide with a low content of potassium are studied. The paper presents the results of X-ray phase analysis, differential thermal analysis (DTA) and electron microscopy of differential thermal analysis of KxCu1.85S alloys. The resulting alloys are a mixture of phases, in which the main share is djurleite - non-stoichiometric copper sulfide of the composition Cu1.97÷1.93S , in addition, depending on the composition of the alloy, there are impurities of monoclinic and hexagonal chalcocite Cu2S , roxbyite Cu1.81S , anilite Cu1.75S , traces of metallic copper. All alloys contain inclusions of Cu2O copper oxide. DTA detected a superionic phase transition from an ordered
low-symmetry djurleite phase to a disordered superionic hexagonal phase of copper sulfide at about 373-383 K. In addition, DTA revealed two thermal effects at about 433 K and 460 K, which are absent in binary copper sulfide. The reason for the effects may be the redistribution of impurity potassium ions in the copper sulfide lattice.

85-92 143

Among new low melting glasses, bismuthate glass is deemed to have the most potential. Current studies of these glasses focus on the thermal and structural influence of the additional oxide (NiO). The glass transition temperature, Tg and peak crystallization temperatures( Tp1 and Tp2 ) was studied in
all samples using a differential scanning calorimeter. We found that the glass transition temperature and crystallization temperature increases with the increase in the content of NiO. Further, NiO-ZnOBi2O3 - B2O3 glasses were investigated spectroscopic ally with Fourier-Transform Infrared (FTIR) spectra
recorded for glass with different main oxide contents. The formation of B-O-Bi and B-O-Zn/Ni bridging bonds in the glass structure is suggested from FTIR spectra. In the present work, the thermal and structural properties of zinc bismuth borate glasses doped nickel ions have been carried out. 

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