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  • 1
    Electronic Resource
    Electronic Resource
    Applicability of the empirical Varshni relation for the temperature dependence of the width of the band gap (1999)
    Springer
    Physics of the solid state 41 (1999), S. 905-908 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have carried out a comparison of relations used to describe the temperature dependence of the width of the band gap in crystals. It is shown that for kT≫ℏω the well-known Varshni relation can be obtained from the non-empirical Fan expression in explicit form taking account of the phonon statistics. We have calculated the temperature coefficient bof the width of the band gap for a number of materials in the range where the high-temperature condition is not met. We have found that the Varshni relation overestimates β, whereas calculations based on the Fan expression agree with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130901
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  • 2
    Electronic Resource
    Electronic Resource
    The Urbach rule for the PbO-SiO2 glasses (2000)
    Springer
    Physics of the solid state 42 (2000), S. 230-235 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis is made of the behavior of optical spectra of lead-silicate glasses, with variable lead content near the UV absorption edge, and within the 80–470-K range. A generalized formulation of the modified Urbach rule, applicable to glassy materials within a broad temperature range, is proposed for the interpretation of experimental spectral relations. Within this approach, the effective energies of the phonons responsible for the temperature-induced shift of the Urbach edge have been calculated. It is shown that the spectral and temperature parameters of the modified Urbach rule are structure-sensitive, and that their concentration behavior reflects the change of the type of short-range order in the glassy matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131151
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature behavior of the 6.05-eV band in optical absorption spectra of oxygen-deficient corundum (2000)
    Springer
    Physics of the solid state 42 (2000), S. 1259-1265 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of temperature on the 6.05-eV absorption band in α-Al2O3 has been studied in the 80–515 K region. The data obtained are analyzed in terms of a one-coordinate model with strong electron-phonon coupling. This band is shown to be formed by two peaks at 5.91 and 6.22 eV (T=293 K) originating from absorption at the F + and F centers, respectively. An analysis of the experimental temperature dependences has allowed us to calculate the energies of effective phonons responsible for the broadening and shift of the peaks. The energies calculated agree with the data obtained in other studies and lie in the region of corundum acoustic-vibration frequencies. The Huang-Rhys factors have been evaluated for both centers and found to be close to the estimates made by other authors. The results are discussed in detail and compared with independent data on optical absorption and luminescence of anion centers in colored and irradiated α-Al2O3 single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131373
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  • 4
    Electronic Resource
    Electronic Resource
    Alloying open-hearth and electric steels with vanadium slag (1974)
    Springer
    Metallurgist 18 (1974), S. 108-110 
    Details
    ISSN: 1573-8892
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132578
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetic equations for suspension separation (1983)
    Springer
    Journal of engineering physics and thermophysics 45 (1983), S. 1142-1147 
    Details
    ISSN: 1573-871X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A kinetic equation for description of suspension separation is proposed. Examples of determining effective rheological characteristics and phase separation surfaces during filtration are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00827085
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    Paper (German National Licenses)
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