No abstract available

[en] Niobium energies in various polymorphous modifications, as well as niobium carbide energy were calculated with attraction of numerical calculation of electronic structure of mentioned materials. Correlation of energies of the system niobium-niobium carbide with various polymorphous niobium modifications was used to obtain the dependence of critical carbon concentrations n_c, required for induced transformation of the basic BCC lattice into FCC or HCP one, on the dimensions of spherical carbide precipitations, formed during implantation. Critical carbon concentrations for polymorphous niobium transformations were found with account of free energy of crystal lattice, energy of elastic stress fields and energies of interphase boundaries

[en] The de Haas-van Alphen (DHvA) effect is studied experimentally in the intermetallic compound Cd₃Mg. More than seven separate dHvA frequency brunches are observed and several effective masses and Dingle temperatures are determined. The band structure calculations based on the semiempirical pseudopotentials are carried out both for Cd₃Mg and Mg₃Cd to construct the Fermi surfaces (FS) of these compounds. It is possible to propose the explanation of dHvA frequency brunches in Cd₃Mg using the calculated angle dependence of FS extremal cross sections. The role of spin-orbit interaction effects in Cd₃Mg electron band spectrum and FS formation is discussed

[en] Experimental and theoretical investigation into magnetic susceptibility of pure beryllium monocrystals and Besub(100-x)Cusub(x) (with x=0.54 and x=1.34) alloys in the 77-1500 K temperature range is carried out. Noticeable decrease of diamagnetism of susceptibility component kappasub(parallel) with temperature growth is established, and transformation of diamagnetic extremum in kappasub(perpendicular)(T) in beryllium-copper alloys is also studied. Quantitative description of temperature dependences of susceptibility components kappasub(parallel) and kappasub(perpendicular) in the investigated samples is obtained within the frames of the suggested theory of beryllium magnetism based on the results of calculation of Be zonic structure and data on electron Be(Cu) spectrum

No abstract available

[en] Shortly reviewed are the studies of monotone magnetic susceptibility of conduction electrons in simple metal alloys. Shown are broad informative possibilities of orbital magnetism in spectroscopy of non-ordered metal systems

[en] The Zeeman splitting for conduction electrons in d-metals such as vanadium, niobium, tantalum is studied theoretically by the RLMTO method. The results are presented, which were obtained from calculation and averaging of g-factors, from the analysis of their stability against variations of the number of states and from calculation of the Zeeman level splitting enhancement due to the electron-electron interaction. The orbit averaged g-factors are found to dislplay the anisotropic behaviour on 02 sheet of the Fermi surface in these metals. The calculated results are compared with experimental one and those obtained by other authors. Common trendes of the g-factor behaviour are formulated for all transition d-metals with cubic structure

[en] The electron energy spectrum of the compound Cd₃Mg is calculated at T=0 K using nonlocal semiempirical pseudopotentials. The detailed dependences of electron densities of states are obtained, which suggest the existence of essential differences between the band structures of Cd₃Mg and pure cadmium. The evolution of the total energy of the crystal is observed during the transition from cadmium to the disordered phase and then to the ordered one of Cd₃Mg. It is shown that the energy of the band structure is minimum in the ordered phase

[en] Electronic structure calculations are carried out for the ferromagnetic GdM₂ compounds (M=Mg, Al, Fe, Co, Ni, Rh, Ir, Pt). By using the calculated susceptibilities, densities of electronic states, and exchange parameters, the Curie temperatures were evaluated for these compounds in the framework of a modified molecular-field approach. The calculated magnetic ordering temperatures appeared to be in improved agreement with experimental data, in contrast to the results obtained within a conventional mean-field theory

[en] Using semiempirical nonlocal pseudopotentials and ex-- perimental data on the character of crystal lattice vibration the electron spectra of cadmium and beryllium are experimentally studied in a wide temperature range. On the basis of calculated results for the zone structure a number of particularities in the electron spectra is predicted and temperature dependences of beryllium and cadmium magnetic susceptibility are explained. It is found that for these metals the Debye-Waller factor taken into account within the frames of the pseudopotential method provides a rather reliable quantitative description of thermal rearangement of the zone structure