Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques最新文献_第2页

Relationship of Locally Inhomogeneous, Elastic, and Magnetic Fields in Mn–Zn Ferrites 锰锌铁氧体中局部不均匀场、弹性场和磁场的关系

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700654

Z. A. Samoylenko, N. N. Ivakhnenko, E. I. Pushenko, M. Yu. Badekin, V. Ya. Sycheva

{"title":"Relationship of Locally Inhomogeneous, Elastic, and Magnetic Fields in Mn–Zn Ferrites","authors":"Z. A. Samoylenko, N. N. Ivakhnenko, E. I. Pushenko, M. Yu. Badekin, V. Ya. Sycheva","doi":"10.1134/S1027451024700654","DOIUrl":"10.1134/S1027451024700654","url":null,"abstract":"The regularities of changes in the atomic, electronic, and magnetic subsystems in ferrites of variable composition MnxZnyFezO4 related to the formation of clusters differing in the composition of cations are studied using the methods of X-ray diffraction analysis, X-ray spectroscopy, and theoretical physics. Experimentally detected clusters appearing in the X-ray diffraction patterns as a halo are characterized by a certain superposition of ion states, the magnetic moment of which depends not only on the spin of the electron, but also on its orbital moment and the spin of the nucleus. In a mesoscopic cluster structure, a phase transition from manganese-containing clusters stipulated by the interaction of trivalent manganese ions with oxygen ions to clusters with a predominance of divalent and trivalent manganese ions with oxygen ions is discovered. It is found that the clustered structure of manganese-zinc ferrites is responsible for the appearance of extreme magnetic properties; the maximum corresponds to a change in the dominant type of clusters. It is found that with an increase in mass density, a repopulation of energy states occurs: a decrease in the number of states of the low-energy electron group and their increase in the high-energy group in the form of a Fermi-surface saddle point. It is established that the peculiarities of condensation of the basic and soft modes of complexes (clusters) containing manganese and oxygen ions result in changes in the physical parameters of the samples.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"920 - 928"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414007","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 Phosphorus-Containing Dispersant on the Microstructure and Optical Properties of Scintillation Ceramic (Gd,Y)3(Al,Ga)5O12:Ce with Garnet Structure 含磷分散剂对石榴石结构闪烁陶瓷 (Gd,Y)3(Al,Ga)5O12:Ce 显微结构和光学特性的影响

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700733

P. V. Karpyuk, L. V. Ermakova, V. V. Dubov, D. E. Lelekova, R. R. Saifutyarov, P. A. Zhdanov, M. S. Malozovskaya, I. Yu. Komendo, P. S. Sokolov, A. G. Bondarau, M. V. Korzhik

引用次数: 0

Development of a Linear Position-Sensitive Scintillation Neutron Detector Based on ZnS(Ag):6Li and Silicon Photomultipliers 开发基于 ZnS（Ag）：6Li 和硅光电倍增管的线性位置敏感闪烁中子探测器

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700599

D. N. Trunov, V. N. Marin, R. A. Sadykov, E. V. Altynbaev, T. I. Glushkova

{"title":"Development of a Linear Position-Sensitive Scintillation Neutron Detector Based on ZnS(Ag):6Li and Silicon Photomultipliers","authors":"D. N. Trunov, V. N. Marin, R. A. Sadykov, E. V. Altynbaev, T. I. Glushkova","doi":"10.1134/S1027451024700599","DOIUrl":"10.1134/S1027451024700599","url":null,"abstract":"A linear position-sensitive neutron detector based on two silicon photomultipliers and an organic light guide has been developed. Determination of the coordinate of the neutron hitting the detector comes from analyzing the amplitude of the signal received from two silicon photomultipliers located at the ends of the light guide. The results of measurements using a collimated 252Cf source and two types of detectors based on silicon photomultipliers from Sensl with a diffusion reflector and from Hamamatsu without and with a diffusion reflector are presented. Signals from silicon photomultipliers are recorded using an analog-to-digital converter. The neutron impact coordinates are analyzed using the amplitude characteristics of the photosignal. For a detector based on silicon photomultiplier from Sensl, there is no obvious dependence of the signal amplitude on the coordinate of the neutron detection event, in contrast to detectors from Hamamatsu. The resolution of the detector coated with a diffusion reflector is about 10 mm, and without the diffusion reflector it is approximately 5 mm.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"881 - 886"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414072","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

Formation of Thin GaAs Buffer Layers on Silicon for Light-Emitting Devices 在硅上形成用于发光器件的薄砷化镓缓冲层

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700460

V. V. Lendyashova, I. V. Ilkiv, B. R. Borodin, D. A. Kirilenko, A. S. Dragunova, T. Shugabaev, G. E. Cirlin

{"title":"Formation of Thin GaAs Buffer Layers on Silicon for Light-Emitting Devices","authors":"V. V. Lendyashova, I. V. Ilkiv, B. R. Borodin, D. A. Kirilenko, A. S. Dragunova, T. Shugabaev, G. E. Cirlin","doi":"10.1134/S1027451024700460","DOIUrl":"10.1134/S1027451024700460","url":null,"abstract":"The experimental data on the growth processes of GaAs layers on silicon substrates by molecular beam epitaxy are presented. The formation of a buffer Si layer in a single growth process has been found to significantly improve the crystalline quality of GaAs layers formed on its surface and to prevent the formation of antiphase domains on both off-cut toward the [110] direction and singular Si(100) substrates. It has been demonstrated that the use of cyclic thermal annealing at temperatures 350–660°C in the flow of arsenic atoms makes it possible to reduce the number of threading dislocations and increase the smoothness of the GaAs layers surface. Possible mechanisms that lead to improvement in the quality of the surface layers of GaAs are considered. It is shown that for the thus obtained GaAs layers of submicron thickness on singular Si(100) substrates the mean square surface roughness is 1.9 nm. The principal possibility of using thin GaAs layers on silicon as templates for forming on them light-emitting semiconductor heterostructures with active area based on self-organizing InAs quantum dots and InGaAs quantum well is presented. It is found that the resulting materials exhibit photoluminescence at an emission wavelength of 1.2 µm at room temperature.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"796 - 800"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414104","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

Kinetics of Sodium Borohydride Hydrolysis in Comparison with Ammonia Borane Using Cobalt Catalysts 硼氢化钠水解动力学与使用钴催化剂的氨硼烷的比较

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S102745102470071X

N. Ya. Dyankova, N. V. Lapin, V. V. Grinko, V. S. Bezhok, A. F. Vyatkin

{"title":"Kinetics of Sodium Borohydride Hydrolysis in Comparison with Ammonia Borane Using Cobalt Catalysts","authors":"N. Ya. Dyankova, N. V. Lapin, V. V. Grinko, V. S. Bezhok, A. F. Vyatkin","doi":"10.1134/S102745102470071X","DOIUrl":"10.1134/S102745102470071X","url":null,"abstract":"The kinetics of sodium borohydride catalytic hydrolysis with cobalt catalysts Co3O4/ZnO, Co/ZnO, Co3O4/zeolite, Co/zeolite, Co(OH)2, Co3O4, and Co–B was studied, and the kinetic characteristics of the process were compared with the same characteristics of the catalytic hydrolysis of ammonia borane. The concentrations of sodium borohydride and NaOH in aqueous solution in all cases were 0.064 and 0.06 M, respectively. The apparent activation energy and the rate of hydrogen evolution during the sodium borohydride hydrolysis in the temperature range of 35–80°C were determined in each case. The kinetic data were processed using zero-order, first-order, and Langmuir–Hinshelwood reaction models. The apparent activation energies for the sodium borohydride hydrolysis ranged from 37.0 for Co3O4 to 72.6 kJ/mol for Co3O4/ZnO. These values exceeded similar values for the ammonia borane hydrolysis, which were in the range of 26.0–47.4 kJ/mol. A higher rate of hydrogen evolution was observed during the sodium borohydride hydrolysis compared to ammonia borane when using these catalysts, except for Co–B and Co/ZnO catalysts. The maximum rates of hydrogen evolution 3510 and 3140 mL of H2 (g cat)–1 min–1 were observed when using Co(OH)2 and Co–B catalysts, respectively.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"965 - 973"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414247","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

Study of the Evolution of the Structure of a High-Entropy Al20Ni20Co20Fe20Cr20 Alloy under the Action of High Pressure and Temperature 高熵 Al20Ni20Co20Fe20Cr20 合金在高压和高温作用下的结构演变研究

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700551

S. G. Menshikova

{"title":"Study of the Evolution of the Structure of a High-Entropy Al20Ni20Co20Fe20Cr20 Alloy under the Action of High Pressure and Temperature","authors":"S. G. Menshikova","doi":"10.1134/S1027451024700551","DOIUrl":"10.1134/S1027451024700551","url":null,"abstract":"The structure of a high-entropy submicrocrystalline AlNiCoFeCr alloy of equiatomic composition obtained by arc melting is studied by electron microscopy and X-ray diffraction. The alloy consists of a substitutional solid solution with the packing of components corresponding to the B2 structure based on a distorted BCC lattice. The average grain size of the B2 phase is 120 nm. The stability of the alloy with increasing temperature is studied. When the alloy is heated to 1650°C and subsequently solidified an increase in the grain size of the B2 phase and the separation of several phases with different morphologies along the grain boundaries are observed in the structure. The effect of high pressure on the alloy structure after quenching from the liquid phase is explored. The structure of the sample obtained upon solidification at a temperature of 1650°C under a pressure of 5 GPa is different from the structure of the alloy obtained at a temperature of 1650°C by arc melting. Under thermobaric conditions, a structure of mixed A1 (body-centered cubic) and A2 (face-centered cubic) phases is formed in the alloy. The alloy has high hardness, the value of which, depending on the selected production conditions, varies from 4.8 to 5.5 GPa.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"851 - 858"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413976","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

Development of a Vector Magnet Based on High-Temperature Superconductors for Working with Polarized Neutrons 开发基于高温超导体的矢量磁体，用于偏振中子工作

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700629

A. V. Altynov, A. P. Buzdavin, V. I. Bodnarchuk, V. D. Zhaketov, A. V. Petrenko, M. D. Proyavin, A. N. Chernikov

{"title":"Development of a Vector Magnet Based on High-Temperature Superconductors for Working with Polarized Neutrons","authors":"A. V. Altynov, A. P. Buzdavin, V. I. Bodnarchuk, V. D. Zhaketov, A. V. Petrenko, M. D. Proyavin, A. N. Chernikov","doi":"10.1134/S1027451024700629","DOIUrl":"10.1134/S1027451024700629","url":null,"abstract":"Polarized neutron reflectometry is an experimental method for studying metallic thin heterophase layered materials, polymer films, biological systems, the free surfaces of liquids, and magnetic fluids. It requires experimental equipment that includes a special magnetic system. The magnetic system described in this work, a vector magnet, will allow one to change the direction of the magnetic field in three directions, to place a temperature-control device inside at low and ultra-low temperatures, and will have an aperture that allows one to place a system for detecting neutrons and gamma rays outside. According to calculations, the cryomagnet will allow the application of a maximum field in the vertical plane of up to 3 T, and in the horizontal plane of up to 1 T. To manufacture a vector magnet, in this work, it is proposed to use a tape made of a high-temperature superconductor with a width of 4 mm. A cryostat with a vector magnet will be installed at the REMUR reflectometer on the eighth channel of the IBR-2 reactor.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"900 - 907"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414075","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

First Measurements at Neutron Reflectometers TNR and NERO-2 中子反射仪 TNR 和 NERO-2 的首次测量结果

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700605

M. V. Dyachkov, V. A. Matveev, V. G. Syromyatnikov, V. V. Tarnavich, V. A. Ulyanov

{"title":"First Measurements at Neutron Reflectometers TNR and NERO-2","authors":"M. V. Dyachkov, V. A. Matveev, V. G. Syromyatnikov, V. V. Tarnavich, V. A. Ulyanov","doi":"10.1134/S1027451024700605","DOIUrl":"10.1134/S1027451024700605","url":null,"abstract":"The paper briefly describes the main units of TNR and NERO-2 neutron reflectometers installed in the hall of horizontal experimental channels of the new high-flux PIK reactor (PNPI, National Research Center “Kurchatov Institute”) as part of the program for commissioning the first five stations of the instrument base of this reactor. TNR and NERO-2 neutron reflectometers are designed for conducting studies of the magnetic and nonmagnetic multilayer nanostructures, including certification of neutron-optical elements for the neutron stations. The TNR has the ability to work in measurement modes with “white” unpolarized/polarized beams and with monochromatic unpolarized/polarized neutron beams (wavelengths from 0.09 to 0.5 nm). NERO-2 is a high-resolution reflectometer with a fixed wavelength and the ability to work with both unpolarized and polarized monochromatic beams. The paper discusses the results of the first measurements of neutron-optical samples on a glass substrates carried out on TNR and NERO-2 reflectometers at the start of the PIK reactor at a power of 7 MW. Measurements were carried out on TNR with a supermirror, which is an aperiodic multilayer nanosystem of 171 pairs of alternating Ni and Ti layers (m = 2.5). On NERO-2, measurements were carried out with a mirror monochromator, which is a periodic multilayer nanosystem of 60 pairs of alternating NiMo and Ti layers with a thickness of 60 Å each.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"887 - 893"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414093","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

Skyrmions and Fluctuations of Spin Spirals in Strongly Correlated Fe1 – хCoxSi with a Noncentrosymmetric Cubic Structure 具有非中心对称立方结构的强相关 Fe1 - хCoxSi 中的天火和自旋螺旋波动

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S102745102470068X

A. A. Povzner, A. G. Volkov, T. A. Nogovitsyna

{"title":"Skyrmions and Fluctuations of Spin Spirals in Strongly Correlated Fe1 – хCoxSi with a Noncentrosymmetric Cubic Structure","authors":"A. A. Povzner, A. G. Volkov, T. A. Nogovitsyna","doi":"10.1134/S102745102470068X","DOIUrl":"10.1134/S102745102470068X","url":null,"abstract":"We investigate strongly correlated solid solutions of Fe1 – xCoxSi with a disrupted B20 cubic structure. Within the framework of spin-fluctuation theory and a model of the density of electronic states derived from first-principles calculations using the generalized gradient approximation with the inclusion of strong Coulomb correlations (GGA + U), temperature transitions in Fe1 – xCoxSi alloys (illustrated with the examples of x = 0.2 and 0.3) with Dzyaloshinskii–Moriya interaction are examined. In the considered compounds, a “blurred” temperature-dependent first-order magnetic phase transition occurs, which is accompanied by a change in the sign of the intermode-coupling parameter in the Ginzburg–Landau functional. During such a transition, skyrmion A phases emerge within limited temperature ranges and external magnetic fields, beyond which experimentally observable fluctuations of the magnetic moments of spin spirals occur. The (h–T) diagrams are plotted, indicating regions of long-range order, and fluctuational and skyrmion phases. Fe1 – xCoxSi phases with x = 0.2 and 0.3 align well with experimental observations.","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"18 4","pages":"944 - 949"},"PeriodicalIF":0.5,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414103","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

Quantitative Analysis of the Dispersion Interaction of Liquids with the Surface of Gamma-Irradiated PTFE 定量分析液体与伽马射线辐照聚四氟乙烯表面的分散相互作用

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Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI: 10.1134/S1027451024700459

A. Yu. Obvintsev, S. A. Serov, S. A. Khatipov, N. V. Sadovskaya

引用次数: 0