Light wave diffraction on reflection holograms in a cubic piezoelectric crystal

Analytical expressions for the electric field strength in a signal wave formed during the interaction of opposite waves in a cubic photorefractive piezoelectric crystal are obtained in the given grating approximation. As a result of the optical activity of the medium, the amplification coefficient and the diffraction efficiency of a hologram in the \(\left( {\bar 1\bar 1\bar 1} \right)\) cut crystals may exceed the analogous values for the \(\left( {00\bar 1} \right)\) cut crystals.     

Structure,microhardness, and stability of rapidly solidified In-Sb foils

We report the structure, microhardness, and stability of rapidly solidified In-Sb foils. The foils have a (101) texture and contain fine InSb particles. Annealing reduces their texture and leads to coalescence of the indium antimonide particles. The InSb particles increase the microhardness of the foils.     

Structure and properties of rapidly solidified Sn-Zn foils

We have studied the phase composition, chemical homogeneity, surface morphology, aging behavior, thermal stability, and grain structure of rapidly solidified Sn-Zn foils. The surface of the foils is found to have a cellular structure. The effect of solidification rate on the properties of the foils is examined. Data are presented on the microhardness of the foils as a function of zinc content. The microhardness data are interpreted in relation to the microstructure of the foils.     

Microstructure of Rapidly Solidified Alloys of the Sn–Zn–Bi–In System

The results of a study of the phase composition and microstructure of foils of Sn–8.0 Zn–3.0 Bi–X In (X = 1.5, 2.5, 4.5, 9.0) (wt %) alloys formed by rapidly quenching from the melt at a cooling rate of up to 5 × 10⁵ K/s have been presented. The dependence of the phase composition of the rapidly quenched foils on the concentration of In has been determined. It has been shown that, in rapidly quenched foils, crystallization occurs with the formation of supersaturated solid solutions based on β-Sn and γ phase (Sn₄In). The mechanisms and rates of decomposition of the supersaturated solid solutions at room temperature have been established. The specific features of the formation of the microstructure of the foils have been discussed. The grain structure has been studied by the electron back-scatter diffraction (EBSD) method; the formation of an elongated shape of grains and the high specific surface area of small-angle boundaries has been explained.     

The effect of optical activity on the coherent interaction of screening solitons in a cubic photorefractive crystal

The coherent interaction of solitonlike beams in a cubic photorefractive crystal of sillenite type has been studied by method of numerical modeling. The effect of optical activity on the attraction and repulsion of light beams is considered for various orientations of the external electric field.     

Thermoelectric Properties of Semimetal and Semiconductor Bi1 –xSbx Foils and Wires

Semiconductors - The results of experimental investigations into the thermoelectric properties (electrical conductivity, thermoelectric power, and thermal conductivity) of microtextured foils and...     

Structure and properties of rapidly solidified Sn-58 wt % Bi foils

We have studied the microstructure and microhardness of rapidly solidified foils of the Sn-58 wt % Bi alloy. Precipitates of tin- and bismuth-based solid solutions have been shown to be evenly distributed over the foils and to have a microcrystalline structure. The tin-based solid solution in the foils has (100) texture, and the grains of the bismuth-based solid solution have (10 $\bar 1$ 2) preferential alignment. Room-temperature storage of the foils increases their microhardness by about a factor of 2.     

Structural and electrical properties of rapidly quenched Bi2-x Sb x Te3 foils

Liquid-quenched Bi_2-xSb_xTe₃ foils are found to have a pronounced (0225) texture. At high antimony concentrations, (1120) texturing also becomes significant. The compositions at which the magnitude of thermoelectric power is maximal are established. The electrical transport in the foils is shown to be dominated by holes at largex and electrons at smallx.     

Orientation dependence of the diffraction efficiency of holograms in cubic photorefractive (111)-cut piezocrystals

The diffraction efficiency of the transmission holograms in the photorefractive (111)-cut crystals of the classes [`4]3m\bar 43m and 23 depends on the orientation of the lattice vector. This effect is determined by combined manifestation of the piezoelectric and photoelastic properties of the crystal. The shape of this dependence is determined both theoretically and experimentally for the fixed linear polarizations of the readout light waves in a 2.1-mm-thick (111)-cut Bi₁₂SiO₂₀ crystal (class 23).