Поверхность. Рентгеновские, синхротронные и нейтронные исследования最新文献

Investigation of the Effect of Defocusing on Interference Patterns Obtained in X-Ray Three-Block Interferometers 研究散焦对 X 射线三块干涉仪中获得的干涉图案的影响

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020154

H. Drmeyan, M. Vasilyan

{"title":"Investigation of the Effect of Defocusing on Interference Patterns Obtained in X-Ray Three-Block Interferometers","authors":"H. Drmeyan, M. Vasilyan","doi":"10.31857/s1028096024020154","DOIUrl":"https://doi.org/10.31857/s1028096024020154","url":null,"abstract":"The results of studying the effect of defocusing on interference patterns obtained in X-ray three-block interferometers are presented. Three-block defocused interferometers without a thick block analyzer, with a thick block analyzer and with a separate thick block (enlarger) are designed, manufactured and tested. It is shown that fine structures of interference patterns obtained from three-block defocused interferometers are observed in cases when the interferometer analyzer block is thick or an enlarger is used (fourth thick block). Theoretical calculations show that in the presence of defocusing, as a result of superposition of beams on the input surface of the interferometer analyzer, an interference pattern is formed in the form of parallel fringes (lines) lying in the scattering plane. The coordinates of the maxima of the interference fringes (lines) and the period of the fringes are calculated in the cases without a thick crystal and in its presence, as well as the magnification factor. It has been experimentally proved that a thick crystal (enlarger crystal) does not introduce new information into the interference pattern, but only increases its size in the scattering plane.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"3 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141641577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of a Constant Magnetic Field on the Parameters of the Magnetoplastic Effect in Aluminum Alloy B95pch 恒定磁场对铝合金 B95pch 中磁塑效应参数的影响

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020095

J. V. Osinskaya, S. V. Voronin, S. R. Makeev, I. I. Levin

{"title":"Influence of a Constant Magnetic Field on the Parameters of the Magnetoplastic Effect in Aluminum Alloy B95pch","authors":"J. V. Osinskaya, S. V. Voronin, S. R. Makeev, I. I. Levin","doi":"10.31857/s1028096024020095","DOIUrl":"https://doi.org/10.31857/s1028096024020095","url":null,"abstract":"The present work is devoted to the comprehensive experimental study of the magnetoplastic effect found in the aluminum alloy B95pch aged in a weak constant magnetic field. The data on chemical composition of aluminum alloy B95pch, modes of thermal and thermomagnetic treatments and main experimentally observed regularities of changes in values of microhardness, modulus of elasticity of separate local areas and phase composition of aluminum alloy B95pch, aged at temperature 140°С, time from 2 to 8 h, in a constant magnetic field with intensity 557.0 kA/m and in its absence are presented. It was found that the constant magnetic field significantly affects the strength properties and structure of aluminum alloy B95pch. The negative magnetoplastic effect has been detected, the value of which is 21%. It is observed that the constant magnetic field does not significantly affect the average grain size, however, the size and number of observed foreign inclusions within the grain become significantly smaller compared to aging in the absence of magnetic field. In addition, the imposition of the constant magnetic field on the phase formation process leads to the formation of a more distorted structure: the half-width of diffraction lines becomes wider. The results of microhardness and modulus of elasticity measurements of aluminum alloy B95pc were found to be correlated.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"9 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141641119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Experiments on Growing Zinc–Cadmium Telluride Crystals in Microgravity 微重力条件下碲锌镉晶体生长实验的准备工作

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020132

А. S. Аzhgalieva, Е. B. Borisenko, D. N. Borisenko, А. Е. Burmistrov, N. N. Кolesnikov, А. V. Тimonina, А. S. Senchenkov, Т. N. Fursova, О. F. Shakhlevich

{"title":"Preparation of Experiments on Growing Zinc–Cadmium Telluride Crystals in Microgravity","authors":"А. S. Аzhgalieva, Е. B. Borisenko, D. N. Borisenko, А. Е. Burmistrov, N. N. Кolesnikov, А. V. Тimonina, А. S. Senchenkov, Т. N. Fursova, О. F. Shakhlevich","doi":"10.31857/s1028096024020132","DOIUrl":"https://doi.org/10.31857/s1028096024020132","url":null,"abstract":"Cd1-xZnxTe crystals are necessary for the production of ionizing radiation detectors widely used in science, technology, medicine and other fields. Internal stresses during crystallization lead to generation of dislocations and low-angle boundaries. Typical problem of melt crystal growth of Cd-Zn-Te compounds are tellurium inclusions, which deteriorate detector performance. Microgravity conditions provide unique opportunities for growing high-quality crystals due to the absence of convection, more equilibrium conditions of melt mixing, and a decrease in internal stresses. Since the properties of such crystals strongly depend on the production conditions, seeds and a feed ingot with specified compositions and structure are required. Ampoules with two compositions of materials have been prepared for the space experiment. Crystals of different compositions Cd0.96Zn0.04Te and Cd0.9Zn0.1Te were produced for two charges. They consist of an oriented seed, solvent, and feeding ingot, which are single-phased, single crystalline, have certain crystallographic orientation, meet demands for growth of Cd–Zn–Te crystals in microgravity. Ampoules containing these materials were sent to International Space Station for crystal growth on equipment already assembled at “Nauka” station.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"1 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141642420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards to Theory of the X-ray Diffraction Tomography of Crystals with Nano-Sized Defects 迈向纳米级缺陷晶体的 X 射线衍射层析成像理论

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020102

V. A. Grigorev, P. V. Konarev, F. Chukhovskii, V. V. Volkov

{"title":"Towards to Theory of the X-ray Diffraction Tomography of Crystals with Nano-Sized Defects","authors":"V. A. Grigorev, P. V. Konarev, F. Chukhovskii, V. V. Volkov","doi":"10.31857/s1028096024020102","DOIUrl":"https://doi.org/10.31857/s1028096024020102","url":null,"abstract":"X-ray diffraction tomography is an innovative method that is widely used to obtain 2D-phase-contrast diffraction images and their subsequent 3D-reconstruction of structural defects in crystals. The most frequent objects of research are linear and helical dislocations in a crystal, for which plane wave diffraction images are the most informative, since they do not contain additional interference artifacts unrelated to the images of the defects themselves. In this work the results of modeling and analysis of 2D plane wave diffraction images of a nano-dimensional Coulomb-type defect in a Si(111) thin crystal are presented based on the construction of numerical solutions of the dynamic Takagi-Taupin equations. An adapted physical expression for the elastic displacement field of the point defect, which excludes singularity at the defect location in the crystal, is used. A criterion for evaluating the accuracy of numerical solutions of the Takagi-Taupin equations is proposed and used in calculations. It is shown that in the case of the Coulomb-type defect elastic displacement field, out of the two difference algorithms for solving the Takagi-Taupin equations used in their numerical solution, only the algorithm for solving the Takagi-Taupin equations where the displacement field function enters in exponential form is acceptable in terms of the required accuracy-duration of the calculations.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141641242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Long-Range Interaction in the Modification of Surface Layers of WC–Co Samples by a Pulsed Ion Beam 脉冲离子束在改变 WC-Co 样品表面层过程中的长程相互作用效应

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020141

A. I. Pushkarev, Y. Egorova, S. S. Polisadov

{"title":"Effect of Long-Range Interaction in the Modification of Surface Layers of WC–Co Samples by a Pulsed Ion Beam","authors":"A. I. Pushkarev, Y. Egorova, S. S. Polisadov","doi":"10.31857/s1028096024020141","DOIUrl":"https://doi.org/10.31857/s1028096024020141","url":null,"abstract":"The results of modification of WC–Co samples by a pulsed beam of nitrogen ions (200–300 keV, 120 ns) with an energy density of 7–8 J/cm2 are presented. It is shown that the change in the structure occurs in the near-surface layer with a thickness of 20–30 µm, which significantly exceeds the range of ions in the target (≈0.5 µm) and the depth of propagation of the thermal front during the pulse (≈1 µm). The analysis of various mechanisms of the long-range effect is carried out: the formation of a shock wave, the generation of primary radiation defects, etc. It is shown that the long-range effect is associated with the charge exchange of ions and the formation of fast atoms. The simulation of the charge exchange of ions in the gaseous layer of desorbed molecules is performed. It was found that the probability of ion charge exchange in the processes N+ + N2 → N0 and N+ + O2 → N0 significantly exceeds 100%, which indicates that the effect of irradiation by atoms was not taken into account while calculating. In contrast to ions, when the target is irradiated with atoms, the efficiency of the formation of radiation defects is much higher.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141643852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Manganite Heterostructures: SrIrO3/La0.7Sr0.3MnO3 and Pt/La0.7Sr0.3MnO3 for Generation and Registration of Spin Current 锰酸盐异质结构：用于产生和注册自旋电流的 SrIrO3/La0.7Sr0.3MnO3 和 Pt/La0.7Sr0.3MnO3

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020127

G. Ovsyannikov, K. I. Constantinian, G. D. Ulev, A. Shadrin, P. V. Lega, A. P. Orlov

{"title":"Manganite Heterostructures: SrIrO3/La0.7Sr0.3MnO3 and Pt/La0.7Sr0.3MnO3 for Generation and Registration of Spin Current","authors":"G. Ovsyannikov, K. I. Constantinian, G. D. Ulev, A. Shadrin, P. V. Lega, A. P. Orlov","doi":"10.31857/s1028096024020127","DOIUrl":"https://doi.org/10.31857/s1028096024020127","url":null,"abstract":"This paper presents the results of experimental studies of the cross section of the boundaries of the SrIrO3/La0.7Sr0.3MnO3 и Pt/La0.7Sr0.3MnO3, heterostructures, in which, upon excitation of ferromagnetic resonance in a La0.7Sr0.3MnO3 film, a spin current arises that flows through the boundary in structure. Epitaxial growth of thin films of strontium iridate SrIrO3 and manganite La0.7Sr0.3MnO3 on a (110) NdGaO3 single-crystal substrate was carried out using magnetron sputtering at high temperature in a mixture of argon and oxygen gases. The spin mixing conductance, which determines the amplitude of the spin current and generally has real Re g↑↓ and imaginary Im g↑↓ parts, was determined from the frequency dependence of the FMR spectrum of the LSMO film and heterostructures. It is shown that the Im g↑↓ quantity, can play an important role in determining the spin Hall angle (θSH) from the angular dependence of the spin magnetoresistance. For the SrIrO3/La0.7Sr0.3MnO3 heterostructures, θSH turned out to be significantly higher (almost an order of magnitude) than for the Pt/La0.7Sr0.3MnO3 heterostructure.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"86 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141643029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energy Barriers for the Spontaneous Magnetization Reversal of the Atomic Co Chains on Pt(664) Surface in the Model with Dzyaloshinskii–Moriya Interaction 在 Dzyaloshinskii-Moriya 相互作用模型中铂(664)表面原子钴链自发磁化逆转的能量障碍

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020053

S. Kolesnikov, E. Sapronova

{"title":"Energy Barriers for the Spontaneous Magnetization Reversal of the Atomic Co Chains on Pt(664) Surface in the Model with Dzyaloshinskii–Moriya Interaction","authors":"S. Kolesnikov, E. Sapronova","doi":"10.31857/s1028096024020053","DOIUrl":"https://doi.org/10.31857/s1028096024020053","url":null,"abstract":"The analytical approach has been developed in the framework of the continuous XY-model. This approach allows calculating the spontaneous magnetization reversal time of finite-length atomic chains on the metallic surface. The interaction of the magnetic moments of atoms is described by the classical Hamiltonian, which includes the Heisenberg exchange interaction, the Dzyaloshinskii–Moriya interaction, and the magnetic anisotropy energy. Using the Co/Pt(664) system as an example, it has been shown that the proposed method is in a good agreement with the results of the numerical simulation in the limit of short and long atomic chains. And for atomic chains of intermediate length, it can be used to estimate an upper bound on the spontaneous magnetization reversal time. We obtained the dependences of the spontaneous magnetization reversal time of finite-length Co chains the value of the exchange integral, parameters of the magnetic anisotropy, and also on the value of the projection of the Dzyaloshinskii vector onto the axis perpendicular to the plane containing the magnetic moments of the atoms. It is shown that the proposed method has a wide range of applicability both in terms of temperature and the values of the physical parameters characterizing the magnetic properties of the atomic chains.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"22 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141644170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Thermal Action on the Change in the Chemical Composition of the Surface Layers of a Titanium Alloy, with a Sprayed Carbon Film, after Irradiation with N+ Ions N+ 离子照射后热作用对喷涂碳膜的钛合金表面层化学成分变化的影响

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020029

V. L. Vorobyov, P. Bykov, F. Z. Gilmutdinov, V. Bayankin, I. G. Pospelova, V. Kobziev

引用次数: 0

Interaction of Titanium Atoms with the Surface of Perfect and Defective Carbon Nanotubes 钛原子与完美和缺陷碳纳米管表面的相互作用

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020041

S. Sozykin, V. P. Beskachko

{"title":"Interaction of Titanium Atoms with the Surface of Perfect and Defective Carbon Nanotubes","authors":"S. Sozykin, V. P. Beskachko","doi":"10.31857/s1028096024020041","DOIUrl":"https://doi.org/10.31857/s1028096024020041","url":null,"abstract":"The dispersion of metal atoms over the surface of 1D and 2D carbon systems is the most affordable way to control their properties, which are attractive for many applications in electronics, power engineering, and catalysis. In this work, the features of the interaction of titanium atoms with the surface of carbon nanotubes, caused by various structural defects on these surfaces, were studied by first-principles computer simulation based on the density functional theory. Nanotubes (7, 7) and (11, 0) with similar diameters (≈1 nm) but different types of conductivity, metallic and semiconductor, respectively, were chosen for the study. Three types of defects were studied: a single vacancy, a double vacancy, and a topological defect. Two possible orientations of each type of defect relative to the tube axis were considered. We mainly used the basis of atomic-like orbitals (the SIESTA package) and in some test calculations also the basis of plane waves (the VASP package). Computational experiments have shown that the binding energy of Ti atoms with a defect-free nanotube is always lower than with defective ones, regardless of the used approximation for the exchange-correlation functional (LDA or GGA). The binding energies predicted in the LDA approximation are noticeably higher than in the GGA approximation (up to ~15% for the (7, 7) tube and up to ~50% for the (11, 0) tube). The strongest coupling occurs when the titanium atom is adsorbed on a nanotube with a single vacancy. The resulting configuration can be considered as a defect in the substitution of one carbon by a titanium atom.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141642154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of the Diffusion of Copper Atom on Graphene by Molecular Dynamics 利用分子动力学模拟铜原子在石墨烯上的扩散

Поверхность. Рентгеновские, синхротронные и нейтронные исследования Pub Date : 2024-07-16 DOI: 10.31857/s1028096024020077

S. V. Khudyakov, S. Kolesnikov, A. Saletsky

{"title":"Simulation of the Diffusion of Copper Atom on Graphene by Molecular Dynamics","authors":"S. V. Khudyakov, S. Kolesnikov, A. Saletsky","doi":"10.31857/s1028096024020077","DOIUrl":"https://doi.org/10.31857/s1028096024020077","url":null,"abstract":"The results of studying the effect of geometric and thermodynamic parameters of thermal evaporation and copper deposition on graphene lying on the Cu(111) surface on the adsorption of copper atoms, as well as their surface diffusion, are presented. The simulation was carried out by classical molecular dynamics using chains of Nose–Hoover thermostats. Interatomic interactions were determined by the Tersoff–Brenner, Rosato–Gillop–Legrand, and modified Morse potentials. A simple criterion for the thermalization of adatoms on graphene lying on a Cu(111) surface was formulated and tested. The average length and mean time of free path of a copper atom before and after thermalization at low (7 K) and room temperatures were studied for two evaporation temperatures. The probability of adsorption of a copper atom was found. The distributions along the directions of motion of adatoms during equilibrium diffusion were constructed. The distributions of the free path length and time were shown to have an exponential form. The influence of the Cu(111) substrate on the diffusion of the Cu atom on graphene was studied. The results obtained can be used to simulate the growth of copper nanoclusters on graphene by the kinetic Monte Carlo method.","PeriodicalId":102205,"journal":{"name":"Поверхность. Рентгеновские, синхротронные и нейтронные исследования","volume":"55 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141643445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0