The high-resolution Fourier diffractometer (HRFD) has been in routine operation since 1994 at the long-pulse neutron source, the IBR-2 reactor, in Dubna. Its fast Fourier chopper provides probably the best compromise between very high resolution in reciprocal space (Δd/d ≈ 0.001) and the intensity. For further improving intensity of TOF-diffraction pattern, a wide-aperture ring backscattering...
Thermal transport in α-Al2O3 irradiated with 167 MeV Xe ions is investigated within direct method based on the Fourier law implemented into classical molecular dynamics. Formation of defective regions as a result of ion passages is described using the original multiscale approach developed in previous works. Thermal conductivity degradation of single-crystalline alumina with ion fluence shows...
The discovery of an increase in the magnetostriction of α-Fe with partial substitution of iron with gallium [1] has led to a significant amount of research, where a similar effect was sought in various binary (Fe-Al, Fe-Ge, Fe-Si, etc.) and ternary (Fe-Ga-Al, Fe-Ga-Ge, etc.) iron-based alloys. Currently, there is a considerable number of studies on the structure and properties of Fe-Ga alloys...
Half-Heisler magnetic intermetallic compounds of transition metals exhibit interesting physical properties such as magnetoresistance, ferromagnetic and antiferromagnetic magnetic states, and superconductivity. It is observed the shape memory effect and superelasticity with opportunity to control there phenomena by means magnetic field. It makes these compounds promising materials to apply for...
Bragg scattering on a crystal is possible only if the wavelength of the radiation does not exceed the double distance between the crystal planes. Usually, in natural crystals, the interplane distance does not exceed ~ 2 Å, so neutrons with a wavelength of more than ~4 Å cease to scatter on them. It is due to this property that such neutrons are allocated to a separate group called cold...
Photoelectrochemical (PEC) water splitting is a promising method for environmentaly benign production of energy in the form of chemical fuels. Monoclinic bismuth vanadate (BiVO4) stands out as an excellent candidate for photoanode material due to its suitable band structure, good stability and low-cost synthesis. However, BiVO4 has poor charge transfer properties due to the high rate of...
Sodium-ion batteries (SIB) are promising electrochemical devices due to the sodium availability compared to lithium. Developing efficient cathode materials is very important task for the wide distribution of SIB. One of the perspective cathode materials for SIB are hexacyanoferrates NaxM[Fe(CN)6]·nH2O (Prussian blue analogues, where M are transition metal cations), which have open framework...
To date, one of the most relevant areas of condensed matter physics and materials science is the production and study of Bi-activated materials that demonstrate luminescence in a wide range of visible and near-infrared ranges. One of the actively studied inorganic luminescent materials is a group of strontium aluminates as a matrix. The use of strontium aluminates is due to their ability to...
A two-step method was used to synthesize the LiNi0.8Mn0.1Co0.1O2 (NMC811) and copper (Cu)-doped NMC811 (Cu-NMC811) cathode materials, the co-precipitation and solid-state synthesis. The effect of Cu doping on the structure, morphology and electrochemical performance of NMC811 nanopowders was investigated. The thermogravimetric analysis confirmed that the annealing temperatures around 850 ℃ are...
Lithium-ion rechargeable batteries, in particular the cathode materials, are now more essential than ever before as improved, reliable, and effective energy storage systems. Lithium cobalt oxide (LCO), the cathode material now in use, has a reputation for being toxic, expensive, and cobalt-scarce. Due to their accessibility, affordability, and non-toxicity, Nickel Manganese Cobalt (NMC) has...
Polymer brushes represent a class of surface coatings consisting of macromolecules attached to a surface. This class of structures owns unique features such as elongated conformation of polymer chains, possibility to polymer modification and so on, so that they can be utilized in various fields of science and industry. For instance, polymer brushes are used as efficient lubricants with...
The Hong-Ou-Mendel effect (HOM effect) was discovered and experimentally demonstrated by Hong et al. in 1987 [1] and theoretically described in [2]. In this paper, we will consider its implementation on a linear beam splitter consisting of a substrate and two waveguides on it, closely converging in the center, with two input and output ports, and with detectors at each output port. The essence...
Didenko E.A.1,2, Doroshkevich A.S.2,3, Samedovaa U. F. 2,4, Kirillov A.K.1, Vasilenko Т.А.5, Oksengendler B.L.6,7, Nikiforova N.N.6,7, Balasoui M.2,8
1Dubna StateUniversity, Dubna, Russia, 19 Universitetskayastreet, Dubna, Moscowregion,141982
2JointInstituteforNuclearResearch, Dubna, Russia
3Donetsk Institute for Physics and Engineering named after O.O. Galkin, Kiev, Ukraine
4Institute...
The interaction between magnetic fields and superconductors reveals a wide range of intricate phenomena. Superconductors, known for their magnetic properties, can be categorized into two primary types based on their response to an externally applied magnetic field. Type I superconductors completely expel the magnetic field, while type II superconductors allow it to penetrate, resulting in a...
S.V. Zhurenko1,2*, A.A. Gippius1,2, A.V. Tkachev1, A.V. Gunbin1, N. Büttgen3, M. Schaedler3, I. G. Silkin2, I. V. Morozov2, A.S. Moskvin5
1. P.N. Lebedev Physics Institute, 119991, Moscow, Russia
2. Moscow State University, 119991, Moscow, Russia
3. Experimental Physics V, University of Augsburg, 86159, Augsburg, Germany
4. Institute of Natural Sciences and Mathematics, Ural Federal...
Ternary RNiSb and binary RSb materials with R = Gd, Tb, Dy were investigated in terms of their electronic properties and band structures using density functional theory DFT+U method. This method is used to take into account strong electron correlations in the 4f shell of the rare earth metals. Our calculations showed that the considered ternary RNiSb materials are semiconductors with an...
In September of last year 2021, two groups of perovskite samples of different natures (KNN and PZT:Gd) were sent from the Institute of Materials Science and Technology (IMRE) of the University of Havana, Cuba, to be studied in the Frank Laboratory of Neutron Physics (FNLP). The promising results obtained with these samples allowed the opening of a broad scientific collaboration between...
Nanofluids, characterized by the dispersion of nanoparticles in conventional heat transfer
fluids, have gained significant attention in recent years for their potential to enhance thermal
conductivity in various applications. Boron carbide stands out among these nanofluids due to
its exceptional thermal stability and mechanical properties. This study explores a novel
approach for the...
