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  • 1
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    Energy of the elastic loading of anharmonic solids (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: This paper reports on the results of measurements of changes in the temperature of a solid under the adiabatic elastic loading (thermoelastic effect), the coefficient of thermal expansion, and the Young’s modulus of a rigid-chain vitrified polymer, namely, polyimide. It has been found that there are differences in the sign and magnitude of the changes in the energy of thermal origin in samples and the work of the external force. The energy of the thermoelastic effect has been explained in terms of the influence exerted by the anharmonic expansion of a solid, with the separation of the quasi-static potential and dynamic components of the thermal energy of the solid. The loading with an external force causes a redistribution of the thermal energy. A change in the temperature of the solid corresponds to a change in the dynamic component. An energy analysis of the adiabatically loaded anharmonic oscillator has confirmed the conclusion regarding the mechanism of energy transfer and revealed that, under loading, there is a redistribution of the kinetic and potential components of the internal energy of the oscillator.
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  • 2
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    Structure of La(Fe 0.88 Si x Al 0.12 − x (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: X-ray diffraction patterns and nuclear gamma resonance spectra of La(Fe 0.88 Si x Al 0.12 − x ) 13 compounds in the paramagnetic state at room temperature have been investigated. It has been found that all samples have a cubic structure of the NaZn 13 type, in which Si and Al atoms disorderly substitute for iron in the crystallographic position 96 i . An analysis of the Mössbauer spectra using the fitting with doublets with different quadrupole splittings has revealed that the distributions of the aluminum and silicon impurity atoms substituting for iron differ significantly. Aluminum is statistically distributed over nine positions of the 96 i type in the generalized coordination sphere of the Fe2 atom, whereas silicon predominantly substitutes for only six of the nine positions.
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  • 3
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    Influence of the granule size on the magnetocaloric properties of manganite La 0.5 Ca 0.5 MnO 3 (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: The influence of the granule size on the magnetic and magnetocaloric properties of ceramic sample of manganite La 0.5 Ca 0.5 MnO 3 has been investigated. Anomalies indicating the coexistence of the ferromagnetic metallic and antiferromagnetic charge-ordered phases below T C have been found in the temperature dependence of the magnetocaloric effect. It has been shown that a decrease in the granule size to 90 nm leads to the complete suppression of the antiferromagnetic charge-ordered phase.
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  • 4
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    Influence of the isotopic substitution 16 O → 18 O on the magnetic, electrical, and thermal properties of manganite La 0.8 Ag 0.1 Mn (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: The results of the influence of the isotopic substitution of oxygen 16 O → 18 O on the susceptibility, electrical resistance, heat capacity, and the magnetocaloric effect in univalently doped manganite La 0.8 Ag 0.1 MnO 3 are presented. It has been shown that the substitution of 16 O by a heavier isotope 18 O leads to a shift in T C and affects all the measured coefficients. This result indicates the necessity of accounting the lattice dynamics when explaining the mechanism of colossal magnetoresistance in manganites.
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  • 5
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    Organic light-emitting diodes based on polyvinylcarbazole films doped with polymer nanoparticles (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: The optical and electrical properties of light-emitting diode structures with an active layer based on nanocomposite polyvinylcarbazole (PVK) films doped with nanoparticles of another light-emitting polymer, MEH-PPV, have been studied. It has been established that the size of MEH-PPV particles in the PVK matrix is of the order of 100 nm. The spectral range of photoluminescence of such structures can be changed by varying the ratio of PVK to MEH-PPV. The current-voltage characteristics of composite light-emitting diodes based on PVK: MEH-PPV films indicate p -type conductivity. It has been shown that a decrease in the MEH-PPV nanoparticle concentration in the PVK matrix shifts the threshold values of the bias for the onset of electroluminescence toward smaller values and makes the photoluminescence and electroluminescence spectra more similar to the spectrum of the white light-emitting diode. The influence of the form of the polymer and polymer nanoparticles on the mechanisms of injection and transport of charge carriers and the radiative recombination in the studied structures has been discussed.
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  • 6
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    Interfaces in superconducting hybrid heterostructures with an antiferromagnetic interlayer (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: The structural, X-ray diffraction, and electrophysical studies of hybrid superconducting hetero-structures with an interlayer of cuprate antiferromagnetic Ca 1 − x Sr x CuO 2 (CSCO) with the upper electrode Nb/Au and the lower electrode Y B a 2 Cu 3 O 7 − δ (YBCO) have been carried out. It has been experimentally shown that the epitaxial growth of two cuprates, YBCO and CSCO, results in the formation of an interface on which the enrichment of the CSCO interlayer with charge carriers proceeds to a depth of about 20 nm. In this case, the conduction of the enriched CSCO region proves to be closer to metallic, whereas the CSCO film deposited onto the NdGaO 3 substrate is a Mott insulator with hopping conduction.
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  • 7
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    Mobility of nondegenerate two-dimensional electrons in scattering by a correlated distribution of impurity ions (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: The temperature dependences of the inverse mobility of nondegenerate two-dimensional electrons in scattering by impurity ions in heterostructures with a narrow spacer have been investigated using the Al x Ga 1 − x As/GaAs heterostructure as an example. Correlations in the arrangement of impurity ions have been taken into account in the model of hard spheres on a plane. The influence of the form of the structure factor in the electron mobility has been considered.
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  • 8
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    Influence of high hydrostatic pressure on the vibrational spectrum of an edge dislocation and its dynamic interaction with point defects (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: The slip of a single edge dislocation in an elastic field of point defects chaotically distributed over a crystal with allowance for a high hydrostatic pressure has been studied theoretically. The numerical estimations have demonstrated that hydrostatic compression of some metals and alloys increases the dislocation drag force by point defects in them by several tens of percent.
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  • 9
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    Photoelectric, nonlinear optical, and photorefractive properties of polymer composites including carbon nanotubes and cyanine dyes (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: The effect of cyanine dye additives on the photoelectric, nonlinear optical, and photorefractive properties of polyvinyl carbazole composites based on closed single-walled carbon nanotubes has been investigated. It has been found that these characteristics are affected by the dye in which the lowest unoccupied molecular orbital (LUMO) lies below the level of the photoexcited nanotube. The addition of this dye to the composite leads to a 14-fold increase in the quantum efficiency of the generation of mobile charge carriers under irradiation by a laser (1064 nm) in the absorption region of the nanotubes. Moreover, the addition of the dye to the composite decreases the third-order susceptibility χ (3) , presumably, due to the opposite orientations of dipoles of the dye and the nanotube upon adsorption of the dye on the nanotube. The addition of the dye to the composite also provides a twofold increase in the two-beam photorefractive amplification factor of the laser beam with a wavelength of 1064 nm. The obtained values of the two-beam photorefractive amplification factor reach 120 cm −1 .
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  • 10
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    Synchrotron investigations of Si/Mo/Si… c -Si (100) multilayer nanoperiodic structures (2013)
    Springer
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    Publication Date: 2013-04-10
    Description: This paper presents the results of the investigation of c -Si/[Si/Mo] n /Si multilayer nanoperiodic structures by X-ray absorption near-edge structure (XANES) spectroscopy using synchrotron radiation. Changes in the fine structure of XANES Mo L 2,3 spectra confirm the formation of the silicide phase on heterophase interfaces Si/Mo/Si due to the solid-phase interactions between silicon and molybdenum layers.
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