In the present work, swift heavy ion irradiation-induced defects in MgAl2O4 single crystals have been studied using photoluminescence (PL) spectroscopy technique. Samples were irradiated with high energy Ar (46 MeV), Kr (107 MeV), Xe (150 MeV) and Bi (710 MeV) ions in the fluence range of 10^10-10^14 cm-2 at IC-100 and U-400 cyclotrons in FLNR JINR (Dubna, Russia). The PL measurements were...
The study of cultural heritage by modern scientific methods is an important interdisciplinary field. Of particular interest are archaeological finds made of metal. They store valuable information about the technological, economic and social level of ancient states. Corrosion processes occurring in metals also require careful study. This allows the development of restoration and conservation...
Resistive plate chamber detector’s type has wide application in high energy physics because their time resolution and the availability of materials for their producing. The electrical signal is induced on the reading cuprum strips. The spatial resolution of the detector can reach hundreds of micrometers. These reasons prompted us to create a new type of thermal and cold neutron detector – a...
Improved thermal barrier coatings (TBCs) will enable future gas turbines to operate at higher gas temperatures [1]. Considerable effort is being invested, in identifying new materials with even better performance than the current industry standard, yttrium stabilized zirconia (YSZ) [2]. Turbines should operate at as high temperature as possible to maximize their efficiency. Until about 15...
Due to their outstanding physical properties, graphene and related materials have a huge potential for applications in electronic and optical devices. In our research graphene layers are obtained by liquid phase exfoliation (LPE) method for the application in SAW sensors. On the other hand, stochiometric lithium niobate (LN) is the best material for such applications, because of its...
Due to their outstanding physical properties, graphene and related materials have a huge potential for applications in electronic devices such as FETs with graphene channels and graphene-based sensors. So, one of the most important characteristics of graphene film is the I-V characteristics. In this research the authors discuss the I-V characteristics of few-layer graphene obtained by liquid...
Developing efficient cathode materials is very important task for the wide distribution of the electrochemical devices, in particular sodium-ion batteries (SIB). One of the perspective cathode materials for SIB is an iron (III) hexacyanoferrate (II) (Prussian White, PW) currently being produced by Altris AB, Sweden [1]. It is one of Prussian Blue Analogues AxM’[M(CN)6]1-y·zH2O (where A is an...
In this article, the effects of geometrical and Physical properties of gyroidal graphene and porous silicon of Cantor sequence terminated by gyroidal layer are studied for Gas sensing applications. The study is investigated in THz frequencies with transverse electric polarized light. Gyroidal graphene layers have good tunable optical properties and can excite Tamm resonance due to the metallic...
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...
The recent discovery of magnetic ordering in van der Waals (vdW) materials down to the monolayer limit has opened a new direction in the field of two-dimensional materials, allowing researchers to explore magnetism in lower dimensions in simple crystal systems. The advent of long-range 2D ferromagnetism brings about new transport phenomena in two dimensions, like tunneling magnetoresistance...
Nowadays studying of proximity effects at the interface between two media are in focus of view [1-5]. In particular it relates to the interface between superconductor and ferromagnet. The work [3] can be can demonstrate as representative experiment, where diamagnetism of the [Nb(25nm)/Gd($d_{f}$)]$_{12}$ periodic heterostructure was observed. The magnetic field was displaced from the volume of...
The study of ferrites of spinel type is of great importance due to the wide variety of their structural and magnetic properties, which are of interest from the point of view of fundamental and applied research. In particular, canted states of an antiferromagnet, ferrimagnet, and spin glass can be realized in these compounds [1].
Significant saturation magnetization, relatively high electrical...
Performance of carbon nanomaterials in electrochemical charge storage is highly dependent on the conductivity of the material, presence of pseudocapacitive functional groups, porosity and the structure. Graphene oxide (GO) is has interesting surface chemistry and structural properties that can be further modified in different ways. Additionally, 2D nature and different active sites make this...
The formation of stable aqueous suspensions and the possibility of surface functionalization make graphene oxide (GO) a great material for composite materials. In this work, physicochemical properties of composites of GO and CoFe2O4 (CFO), including CFO doped with zinc (CFO_Zn) and gallium (CFO_Ga) were investigated. CFO, CFO_Zn, CFO_Ga nanoparticles were prepared by the solvothermal method...
Nanocomposites have enriched modern material systems, contributed to sustainable progress in material science and engineering and improved quality of living. Among other aspects, the surface chemistry of nanomaterials is very important for preparation of nanocomposites. In this study we have analyzed the change in surface chemistry of graphene oxide (GO) and its nanocomposite with...
Bismuth vanadate (BiVO4) has attracted a lot of attention as a promising photoanode for use in the photoelectrochemical (PEC) water splitting. It posseses numerous advantageous features such as great visible light harvesting properties, band edge positions and low-cost synthesis method. The major drawback of BiVO4 is poor charge transfer properties due to the high rate of electron-hole...
The crystal structure of lanthanum titanate La2Ti2O7 was investigated by X-ray diffraction and Raman spectroscopy at high pressures up to 32 GPa and for structural determination neutron diffraction done at ambient condition. The La2Ti2O7 structure is monoclinic with the space group P21 at ambient condition. We observed a structural phase transition into the orthorhombic phase with a space...
A cold neutron storage project is being considered for the projected NEPTUNE reactor. The neutron density in the storage is determined by the absorption and scattering (leakage) of neutrons on the walls of the storage. To determine the probability of neutron leakage, it is proposed to use a neutron wave resonator in which the probabilities of the studied processes are increased. The resonator...
Thermogravimetric, X-ray diffraction, Mössbauer, dielectric, and electrical studies were performed on ceramic samples of the CuCrO2 phase with the delafossite structure synthesized by the method of solid-phase reactions. The effect of electric-field threshold switching of the studied samples from a high-resistance to a low-resistance state, which occurs in the temperature range of 170–200 K...
Hydrogels are three-dimensional cross-linked structures capable of absorbing significant amounts of water, water solutions, and biological liquids without dissolving or losing their structural integrity. The main goal of this work was to describe the kinetics of non-isothermal dehydration of poly(acrylic acid)-g-gelatin (PAAG) hydrogel, swollen in distilled water to different swelling degrees,...
