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  • 2000-2004  (6)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1309467
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  • 2
    Digitale Medien
    Digitale Medien
    Kinetics of “quenching” effect in C60 crystals (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1766-1770 
    Details
    ISSN: 1063-7834
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1309466
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1131227
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  • 4
    Digitale Medien
    Digitale Medien
    Thermal hardening of Ni3Ge alloy single crystals with an L12 superstructure at low temperatures (2000)
    Springer
    Physics of the solid state 42 (2000), S. 2076-2082 
    Details
    ISSN: 1063-7834
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The mechanical properties and the dislocation structure of Ni3Ge alloy single crystals have been experimentally studied at low temperatures. It is found that the flow stresses increase beginning with 4.2 K, and the observed rise in the stresses depends on the orientation of the strain axes of the crystals. The dislocation structure is investigated thoroughly. It is revealed that the mean density of dislocations and the interdislocation interaction parameter α anomalously increase as the temperature increases in the range 4.2–293 K. The mechanisms providing an explanation for the temperature anomaly of flow stresses and the α parameter are considered. The activation energy of thermal hardening is evaluated. It is assumed that the low activation energies of thermal hardening are due to the motion of dislocations at velocities close to the velocity of sound at these temperatures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1324042
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  • 5
    Digitale Medien
    Digitale Medien
    Low-temperature deformation of nanocrystalline niobium (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1066-1069 
    Details
    ISSN: 1063-7834
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1131349
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  • 6
    Digitale Medien
    Digitale Medien
    I–V characteristics and the electric-field effect in melt-grown YBa2Cu3Ox/Y2BaCuO5 HTSC crystals (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1207-1210 
    Details
    ISSN: 1063-7834
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The effect of an electric field E=120 MV/m in the electrode-insulator-superconductor system on I–V curves obtained at 77 K on two types of single-crystal samples cut from monolithic superconducting YBa2Cu3Ox/Y2BaCuO5 has been studied. The Y211 nonsuperconducting phase in the ingot was in the form of precipitates ≈1 µm in size. It has been found that an electric field applied to samples with a comparatively low Y211 content (volume fraction 8%) does not affect the critical current I c while reducing the resistance R at currents slightly above I c . In samples containing more than 35% Y211 phase, electric field results in an increase of I c and a decrease of R for I〉I c . Data on the critical temperature T c and the temperature dependence of I c have also been obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.1131363
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