Eurasian journal of physics and functional materials
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Thermal conductivity of new nanocomposite superionic semiconductors K0.01Cu1.96S, K0.02Cu1.95S, K0.03Cu1.94S, K0.04Cu1.93S, K0.05Cu1.94S
(2023)In this work, we investigated the effect of nanostructuring on the thermoelectric and thermal properties of nonstoichiometric solid splavs doped with copper sulfides with potassium. The synthesized alloys K0.01Cu1.96S , K0.02Cu1.95S , K0.03Cu1.94S , K0.04Cu1.93S , K0.05Cu1.94S are nanocomposite. The crystallite sizes of the synthesized powder, as estimated from the half-width ...2023-12-06 -
Computational scheme for breakup of 11Be on light targets
(2023)We investigate the Coulomb breakup of the 11 Be halo nuclei on a light (carbon) target within nonperturbative time-dependent approach including the low-lying resonance 5/2+ of 11 Be (E= 1.232 MeV). We had found considerable contribution of the low-lying resonances ( 5/2+ , 3/2− and 3/2+ ) to the breakup cross section of 11 Be on a heavy ( 208 Pb) target at our previous calculations. ...2023-12-06 -
Influence of surfactants on the formation and growth of cadmium telluride nanoplatelets
(2023)The article presents a comprehensive review of the current research on the use of surfactants in CdTe nanoplatelet synthesis, including a discussion of the various types of surfactants that have been used and their effects on nanoplatelet size, shape, and optical properties. Additionally, the article examines the mechanisms by which surfactants influence the growth and morphology ...2023-12-06 -
Electron-hole trapping centers in alkali metal sulfates with Dy3+ impurities
(2023)The Na2SO4 − Dy samples were obtained by slow evaporation method. The spectroscopic methods were used to study the mechanisms of formation of electron and hole trapping centers. Intrinsic recombination emission of 2.9–3.1 eV and impurity emission of 2.55 eV and 2.15 eV are excited at 4.0–4.5 eV. Intrinsic SO3−4 − SO−4 and impurity Dy2+ − SO−4 trapping centers were revealed. The ...2023-12-06 -
Non-destructive structural studies of ceramic fragments of ancient tribes of Kazakhstan
(2023)The phase composition of several fragments of the ancient ceramic of the early medieval settlement of Asusay and burial ground Eleke Sazy in the modern Republic of Kazakhstan has been studied using neutron diffraction and Raman spectroscopy. The quartz, calcite, and feldspar minerals are dominant phases in the studied ceramic fragments. The fractions of those phases were ...2023-12-06 -
Thermal and electrical properties of nanocrystalline superionic NaxCu1.75S (x=0.1, 0.15, 0.2, 25) compounds
(2023)The paper presents the results of the studies of thermal properties of nanocrystalline superionic NaxCu1.75S (x=0.1, 0.15, 0.2, 25) compositions, and preliminary results of Na0.1Cu1.75S using as energy stored cathode material in Na-ion half-cell with NaPF 6 electrolyte and Na anode. The compositions contain a few copper sulfide phases: monoclinic chalcocite Cu2S , orthorhombic ...2023-12-06 -
Luminescent properties of BaxMg(2−x) F4 :W ceramics
(2023)Ceramics based on alkaline earth metal fluorides activated by tungsten has been obtained by radiation synthesis. The synthesis was realized by direct action on the mixture with an activator of a powerful flow of high-energy electrons without the use of any additives to facilitate the synthesis. It has been established that the resulting ceramics have luminescent properties ...2023-12-06 -
Electron-hole trapping centers in Na2SO4 with a transition metal impurity Mn
(2023)The Na2SO4 samples were obtained by slow evaporation method. The mechanisms of the formation of electron and hole trapping centers are investigated by spectroscopic methods. Intrinsic recombination emission of 2.9–3.1 eV and impurity emission of 1.85 eV are excited at 4.0–4.5 eV. Intrinsic SO3− 4 − SO−4 and impurity Mn+ − SO−4 trapping centers were revealed. The local levels ...2023-12-06 -
Super–protonic conductors for solid acid fuel cells (SAFCs): a review
(2022)Fuel cell holds the promise of being environmentally friendly and becomes one of the alternatives for renewable energy. Solid acids have super–protonic behavior which allows them to become conductors. It can function at high temperatures. Hydration, on the other hand, may be used to improve the performance of the solid acid. Moreover, the conductivity, stability, and crystal ...2023-12-06 -
Analysis procedures in deriving of the differential cross section of the reaction pp → {pp}sπ0 at energies 1.6–2.4 GeV
(2022)The reaction pp → {pp}sπ 0 , where {pp}s denotes a diproton, i.e. an unbound interacting proton pair in the 1S0 , state, was investigated in order to obtain a differential cross section dσ/dΩ at small angles in the energy range 1.6–2.4 GeV. This work is intended for the presentation of the main procedures in the processing of experimental data.2023-12-06 -
Investigation of the temperature and precursors concentration dependence of the formation of ZnSe quantum dots
(2022)Various variations of the synthesis of ZnSe quantum dots are investigated. The influence of temperature, the concentration of precursors and the time of synthesis of quantum dots was taken into account. Aliquot absorption spectra is measured for various time intervals and the dynamics of the growth of ZnSe quantum dots is estimated. Luminescence and absorption spectra were ...2023-12-06 -
Structural studies of the brass ingots from the Shcherbet historical complex of the Lower Kama region: neutron diffraction and tomography studies
(2022)The structural characteristics and phase composition of several ancient brass ingots obtained in the archeological Shcherbet complex has been studied using neutron diffraction and tomography methods. The XRF analysis and neutron diffraction provide high zinc content up to 30 wt.%. The neutron tomography yielded 3D data of the spatial distribution of chemical elements in the ...2023-12-06 -
Photoluminescence and thermoluminescence in a Li2SO4 crystall
(2022)The nature of intrinsic emission and the creation of electron-hole trapping centers in irradiated with ultraviolet and X-rays at 15 K and 300 K was investigated in Li2SO4 by methods of spectroscopy. It is shown that in activated Li2SO4 with an energy of 6 ÷ 12.4 eV, emission appears in a wide spectral range to excite rare earth ions that are used as UV sources. These same photons ...2023-12-06 -
Evaluation of threshold conditions for latent track formation in nanocrystalline Y2Ti2O7
(2022)We present the first report on the structural effects induced by swift xenon ions in nanocrystalline pyrochlore Y2Ti2O7 (outside the metal matrix) studied using high resolution transmission electron microscopy. Latent amorphous tracks were observed in the range of electronic stopping powers 4.8–23.2 keV/nm. Obtained results enabled estimation of the threshold energy loss values ...2023-12-06 -
Measurements of uranium in urine samples of uranium workers and inhabitants of nearby settlements in Akmola Region, Kazakhstan
(2022)The main purpose is determine and evaluate uranium concentration in urine of the inhabitants of nearby settlement of uranium mining sites and workers of uranium processing sites. As uranium enterprises working in Stepnogorsk of Akmola Region and its exploitation could be a risk of radiation exposure for the workers as well as for the local population, monitoring of biosamples ...2023-12-06 -
Synthesis, X-ray phase analysis and differential thermal analysis of nanocrystalline superionic KxCu1.85S (x<0.05) copper sulfides
(2022)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 ...2023-12-06 -
Non-destructive neutron structural studies of ancient ceramic fragments of the cultural heritage of the Republic of Kazakhstan
(2022)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 ...2023-12-06 -
Study of bound and resonance states of 11Be in breakup reaction
(2022)We investigate the Coulomb breakup of the 11 Be halo nuclei on a lead target within non-perturbative time-dependent approach in a wide range of beam energy (5–70 MeV/nucleon) including the low-lying resonances in different partial and spin states of 11 Be. We have found considerable contribution of the low-lying resonances ( 5/2 + , 3/2 − and 3/2 + ) to the breakup cross ...2023-12-06 -
Magnetic anisotropy and stability of Fe3Ga compounds
(2021)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, ...2023-12-05 -
Application 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
(2021)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 ...2023-12-05
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