Vol 88, No 9 (2024)

An ab initio calculation of the structure and properties of the row of rare earth zirconates R₂Zr₂O₇ (R = La-Lu) were performed. The crystal structure, phonon spectrum, and elastic properties of R₂Zr₂O₇ (R = La-Lu) have been calculated. Vickers Hardness was calculated. The influence of hydrostatic pressure on the frequencies of phonon modes have been studied. The CRYSTAL17 program was used.

The self-diffusion coefficient for symmetrical tilt boundaries and for the general type of grain boundaries in nickel has been calculated by atomistic simulation methods. The special tilt grain boundaries have been simulated in the bicrystal model, and the general type of grain boundaries in the nanocrystal model. The self-diffusion coefficient is presented as a temperature dependence. The activation energies of self-diffusion have been determined.

The Landau–Lifshitz model for semi-infinite ferromagnetic sample with anisotropy of an “easy-plane” type is considered. The new analytical solutions are found, which describe interaction of solitons with the boundary of a ferromagnet. Additional integrals of motion are obtained, that guarantee stability of the solitons under their collision with the boundary of the sample. The changes of parameters of solitons after the collision are calculated.

The influence of the technological parameters of a complex method for obtaining a powder for 3D printing of a new aluminum alloy Nikalin in the process of dispersion in a ball mill with subsequent spheroidization of particles during plasma processing is investigated.

A series of experimental investigations is presented, in which the kinetics of spontaneous heterogeneous boiling-up of superheated n-pentane in two glass tubes has been studied. It has been established that isobaric temperature dependences of the mean lifetime of a superheated liquid obtained under similar conditions have threshold values in the temperature range of 100–115, 120–125 and 130–140 °C.

It was shown that with a high content of solid seeds in the samples, the germination of yellow clover and meadow clover seeds increased sharply after cryoprocessing, and in naked licorice and sickle astragalus, germination increased significantly only after seed treatment with high hydrostatic pressure. It turned out that liquid oxygen stimulates the development of clover seedlings. The origin and conditions of licorice seed formation significantly affect their mechanical properties.

An algorithmic approach for determining the relationship between the energy of grain boundaries and their location in the structure has been developed and proposed. A comparative analysis of the results of relative grain boundary energies measurements by the method of etch groove shape analysis for manual measurement and the developed algorithmic approach was carried out on the example of ultrafine-grained nickel obtained by severe plastic deformation.

We considered a model of charged «semi-hard-core» bosons on a square lattice with a possible occupation number 𝑛_𝑖 = 0, 1, 2 at each node. Using the quantum Monte-Carlo method, temperature phase diagrams of the model were obtained and the influence of local charge correlations was studied. It is shown that local charge correlations lead to an increase in the role of quantum fluctuations in the formation of phase states.

Compacts obtained because of different times of mechanical activation of mixtures corresponding to alloys of VKNA-1V and VKNA-4U grades, with subsequent spark plasma sintering, were studied. The maximum level of tensile strength of compact materials of VKNA-1V is 1200 MPa, and for the VKNA-4U is 1100 MPa, and was achieved after 3.5 minutes of mechanical activation.

We presented a brief overview of the results obtained at the Rzhanov Institute of Semiconductor Physics of SB RAS in the field of the development of photon detectors and emitters promising for use in quantum cryptography systems and miniature quantum frequency standards based on the effect of coherent population trapping.

The spectral behavior of a styrene dye of the quinoline series of type D-p-A in solvents of various natures has been studied, pronounced solvatochromism and sensitivity to the viscosity of the medium have been found. Studies of microcrystalline dye powder by laser radiation on chromium-forsterite with a wavelength of 1250 nm have been carried out. The observed differences in the nonlinearity of the 2nd order are correlated with the structural differences of analog compounds, as well as with the factors organizing the supramolecular system in the crystal.

The results of experimental studies of chiral thin film structures based on arrays of cobalt nanospirals obtained by oblique angle deposition are presented. It has been shown that in the conditions of electron-beam evaporation on rotating tilted substrate arrays of nanospirals winded in the same direction are formed. By varying substrate rotation speed it is possible to change geometrical sizes of those helixes (helix pitch, helix radius). As obtained metasurface showed distinct asymmetry of optical characteristics at the reflection of right and left circular polarized light.