Factors affecting the electron state of the exchange forms of iron adsorbed in layered alumosilicates
Factors affecting the electron state of the exchange forms of iron adsorbed in layered alumosilicates
A.A. Zalutskii, R.N. Kuz'min
The surface of layered alumosilicates catalyzes the process of iron aggregation. At the first stage, the clay minerals adsorb $Fe^{3+}$ ions from the solution. Subsequently, under the influence of the surface subjected to various external factors, these ions aggregate into $[Fe_2^{3+}(OH)_2^-]^{4+}$ dimers and, at the next stage, they form polymeric films with a hydroxide-like structure. Under low pressures ($\sim10^7 Pa$) and under of influence of direct current, the ions and the dimers undergo the transition $Fe^{3+}\to Fe^{2+}$.
Show AbstractApplication of the Kramers-Kronig transformation in solid state physics
Application of the Kramers-Kronig transformation in solid state physics
A.N. Vasiliev, A.V. Kozlov, V.S. Stepanyuk, A.A. Katsnel'son
Difficulties encountered in solving problems of solid state physics with the aid of the Kramers-Kronig relations are analyzed. The application of the fast Fourier transform is shown to reduce considerably the computation time. Criteria are derived for the evaluation of the accuracy of the computation results. The major sources of error in the numerical calculations with these relations are analysed.
Show AbstractA phenomenological model of phase transitions in ferroelectric alums
A phenomenological model of phase transitions in ferroelectric alums
S.V. Pavlov
A phenomenological model is proposed to describe phase transitions in ferroelectric alums. It is shown that the anomaly of the dielectric constant in MASD at 145 К is due to a phase transition in the field of spontaneous polarization which takes place as a result of the interaction between collinear dipole subsystems. Some peculiarities in the behavoir of the dielectric constants of alums under the influence of external factors are explained.
Show AbstractDegradation of metal-silicon dioxide-silicon structures under electron irradiation and injection of hot electrons from silicon into the oxide
Degradation of metal-silicon dioxide-silicon structures under electron irradiation and injection of hot electrons from silicon into the oxide
Yu.N. Kasumov, S.N. Kozlov, A.N. Nevzorov
It is shown that the injection of electrons from silicon into the oxide and the irradiation with electrons lead to similar changes in the energy spectra of the surface states and to an increase in the change instability $Si—SiO_2$-metal structure irrespective of the type of conductivity of the silicon substrate. The charge instability that arises is due to generation of mobile ions and slow electron states in the oxide. The character of the energy spectrum of the surface states depends on conditions of electron injection.
Show AbstractMultifrequency effects in non-autonomous stable oscillators
Multifrequency effects in non-autonomous stable oscillators
I.I. Minakova, B.G. Simeonova
Complex controlled spectra of self-sustained oscillations are shown to be producible in stabilized multiresonator oscillators driven by an external harmonic force. The form of the spectra is related to the detuning of the external force frequencies relative to the oscillator's natural frequencies.
Show AbstractThe role of excited nitrogen molecules in the structure of the ozonosphere
The role of excited nitrogen molecules in the structure of the ozonosphere
M.N. Bidnichenko, A.Kh. Khrgian
It is shown that the mechanism of nitric oxide (NO) formation in the middle atmosphere involving the excited particles $N(^2D)$ and $N_2(A^3 \Sigma _n +)$ is indeed capable of producing the high NO concentrations actually observed in auroras and a substantial decrease of the mesospheric ozone concentration.
Show AbstractSelection of efficient refrigerants for magnetic cooling machines operated within wide temperature intervals
Selection of efficient refrigerants for magnetic cooling machines operated within wide temperature intervals
A.M. Tishin
The problem of selecting refrigerants for magnetic refrigerators operated within wide temperature intervals has been considered. The criteria proposed allowed the determination of rareearth metals and alloys which are promising refrigerants for magnetic cooling machines operated within the 20-77 К and 77-300 К temperature intervals.
Show AbstractThe use of computer-aided analysis of diffraction patterns for the automatization of structural studies of phase transformations
The use of computer-aided analysis of diffraction patterns for the automatization of structural studies of phase transformations
A.S. Ilyushin, A.G. Khundzhua, A.V. Sorokin, I.V. Pestov
A method has been developed for the calculation of diffraction patterns from a single crystal with second-phase precipitates. The method allows the determination of the lattice parameters, the Bravais lattice type, and the orientation relations between the matrix and precipitation phase lattice from the coordinates of reflections on the X-ray diffraction and electron microdiffraction patterns.
Show AbstractThe $\alpha \leftrightarrow \beta$ transformation kinetics in the Pd-H system at low densities of saturation current
The $\alpha \leftrightarrow \beta$ transformation kinetics in the Pd-H system at low densities of saturation current
G.P. Revkevich, M.A. Knyazeva, A.A. Katsnel'son, G. Fernandez, J. Noas
X-ray diffraction methods have been used to study the $\beta$-phase content as a function of the time of palladium saturation with hydrogen. The $\beta$-phase content growth rates are different in regions with different crystallographic orientations. An increase in the saturation time can stabilize the $\beta$-phase.
Show AbstractNeutrino-antineutrino pair photoproduction on electron (with consideration for the neutrino electromagnetic properties) and its astrophisical aspects
Neutrino-antineutrino pair photoproduction on electron (with consideration for the neutrino electromagnetic properties) and its astrophisical aspects
B.K. Kerimov, S.M. Zeinalov
The photoneutrino process, $\gamma _{L,R} e^-_{L,R}\to e^- \nu \bar{\nu}$ due to interactions of the neutrino electromagnetic dipole moments ($\mu_{\nu}, d_{\nu}$) with an electron is examined. Expressions have been obtained for the total cross section of the process and for the photoneutrino luminosity of the Fermi electron gas.
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