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  • 11
    Electronic Resource
    Electronic Resource
    Low-temperature deformation of nanocrystalline niobium (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1066-1069 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The strain characteristics of nanocrystalline niobium are measured in the temperature range 4.2–300 K. It is shown that the development of a strong local deformation with clearly delineated macroscopic slip bands occurs at 4.2 K and 10 K. The thermal effects at a stress jump observed upon transition of the sample (or a niobium strip placed close to the sample) from the superconducting state to the normal state are estimated. It is demonstrated that the temperature dependence of the yield point σs(T) can be divided into three portions: two portions (T〈10 K and T〉70 K) with a slight change in σs and the third portion with a strong dependence σs(T). The strain characteristics of polycrystals with nano-and larger-sized grains are compared with those of single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131349
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  • 12
    Electronic Resource
    Electronic Resource
    Inelastic deformation of C60 single crystals in the temperature range 80–300 K (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1771-1773 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The rate spectrum of small inelastic strains of the C60 single crystal in the temperature range 80–300 K has been obtained with a precision laser interferometer. It is revealed that the spectrum exhibits two large peaks in the glass formation (90–100 K) and phase transition (250–260 K) ranges. A small strain acceleration is also observed at ∼220 and 240 K. The first two maxima are attributed to the changes in strain resistance upon transitions, and the strain acceleration at 220 and 240 K is associated with the annealing of the defects formed upon rapid cooling of the crystal. It is demonstrated that the peak at 250–260 K broadens with an increase in the stress. The spectrum of strain rates is compared with the calorimetric curve for the same single crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1309467
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  • 13
    Electronic Resource
    Electronic Resource
    Some physical properties of an Al2O3-SiC-TiC composite (1997)
    Springer
    Technical physics letters 23 (1997), S. 923-926 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ceramic samples obtained by hot pressing from a mixture of Al2O3 with admixtures of 23 vol.% TiC powder and 30.9 vol.% SiC whisker crystals are investigated experimentally. The resistivity of the material is measured at temperatures of 4.2–300 K, the infrared reflection spectra are recorded in the region 400–4200 cm–1, and the temperature dependence of the Young’s modulus is investigated at temperatures up to 1300 K. As a result it is it is shown that the conductivity and optical reflection of the high-strength composite have a semimetallic character, which is due to the titanium carbide particles contained in it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1261934
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  • 14
    Electronic Resource
    Electronic Resource
    Correlation between the electric-field effect and weak-link type in YBa2Cu3−x Oy and YBa2Cu3−x Oy /Agx high-T c superconducting ceramics (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1088-1090 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental study is reported of the effect of an electric field E⩽120 MV/m and of temperature T on the critical current I c and I-V characteristics of yttrium-based high-T c superconducting ceramics. The materials studied were copper-deficient ceramics, YBa2Cu3−x Oy (D samples), and YBa2Cu3−x Oy/Agx ceramics [S samples with silver present in amounts equal to the copper deficiency (0⩽x⩽0.4)]. It has been established that in D samples at 77 K, the electric field increases I c and reduces substantially R for I〉I c, whereas in S samples no field effect is observed. Measurements of the I c(T) dependence near the critical temperature showed that they can be described for all samples by a relation of the type I c =const(1−T/T c )α, where α≈1 for the D samples, and α≈2 for the S samples. The results obtained suggest that the electric-field effect correlates with the existence in the ceramic of SIS-type weak links at grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130493
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  • 15
    Electronic Resource
    Electronic Resource
    Calorimetric studies of C70S48 crystals (1999)
    Springer
    Physics of the solid state 41 (1999), S. 324-327 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comparative study of the thermodynamic properties of the C70 fullerene, sulfur, and C70S48 crystals has been made by differential scanning calorimetry. It is shown that only C70S48 has an endothermic δ phase transition with a peak at 430 K, which lies in the temperature region exhibiting conductivity and dielectric anomalies. A correlation between the behavior of the sulfur sublattice in the C70S48 crystals and the thermodynamic parameters of the transition has been established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130775
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  • 16
    Electronic Resource
    Electronic Resource
    Determination of elastic moduli of GaN epitaxial layers by microindentation technique (2000)
    Springer
    Physics of the solid state 42 (2000), S. 437-440 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is demonstrated that Young’s modulus of epitaxial gallium nitride layers can be determined by the microindentation of their growth surface. The technique is based on the solution of the Hertz problem for the elastic indentation of a steel sphere into the studied surface. It is established that the isotropic approximation applied in this case is justified and leads to the satisfactory results. The microhardness measurements of epitaxial layers are carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131227
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  • 17
    Electronic Resource
    Electronic Resource
    Kinetics of “quenching” effect in C60 crystals (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1766-1770 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermodynamic transition in the C60 crystals subjected to uniaxial compression at different temperatures and heat treatment has been investigated by differential scanning calorimetry (DSC). The kinetic parameters of the irreversible endothermic “quenching” effect are determined. It is revealed that the process is accompanied by the cooperative molecular motion, which is characteristic of the high-elasticity state of organic glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1309466
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  • 18
    Electronic Resource
    Electronic Resource
    Hysteresis of the current-voltage characteristics and electric field effects in bulk YBCO superconductors (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 969-974 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some YBCO ceramics have been found to exhibit hysteresis of the current/voltage, I/V, characteristics, which reveals at a certain current If greater than critical current Ic a transition with switch from one branch of the I/V curve to another. In present work, the influence of an electric field at 77 K on hysteresis of I/V curves of ceramic YBCO/Ag and YBCO after hydrogen treatment has been studied. It was established that in strong electric field (120 MV/m) the conductivity increases at current I〉Ic, the field effect being observed only in the upper branch of hysteresis loop. The electric field effect in YBCO after hydrogen treatment is reversible. The observed effects are assumed to be associated with a change of grain boundary weak links from S/I/S-to S/N/S-type in the course of hydrogen treatment or addition of silver into ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768508
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  • 19
    Electronic Resource
    Electronic Resource
    Generalized similarity of laminar nonisothermic flows of a viscous gas in thin pipes of variable cross section (1982)
    Springer
    Journal of engineering physics and thermophysics 42 (1982), S. 197-200 
    Details
    ISSN: 1573-871X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The method of generalized similarity of the boundary-layer theory is applied to the problem of laminar flow of a viscous gas in thin circular pipe with cross section which varies along the length of the pipe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00827269
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  • 20
    Electronic Resource
    Electronic Resource
    Temperature dependence of the Peierls-Nabarro forces in body-centered cubic metals (1967)
    Springer
    Materials science 3 (1967), S. 366-367 
    Details
    ISSN: 1573-885X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Based on the Kuhlmann-Wilsdorf theory, an expression for the temperature dependence of the Peierls-Nabarro forces was derived. It was shown that this dependence is in qualitative agreement with experimental data on the influence of temperature on the yield point of bcc metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00714971
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