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  • 1
    Electronic Resource
    Electronic Resource
    Thermophysical Properties of Sulfides of Lanthanum, Praseodymium, Gadolinium, and Dysprosium (2000)
    Springer
    High temperature 38 (2000), S. 875-879 
    Details
    ISSN: 1608-3156
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The temperature dependence of the thermal conductivity, electrical conductivity, thermoelectromotive force, and thermal expansion coefficient for sulfides of lanthanum, gadolinium, praseodymium and dysprosium of the composition Ln3 – x V x S4 is investigated in the temperature range from 300 to 1200 K. It is shown that the transfer phenomena and thermoelectrical properties of the investigated compositions depend on the concentration of current carriers, cation vacancies, and mobility. Gadolinium sulfide is found to have the highest thermoelectrical efficiency. The scattering from ions of rare-earth elements has a noticeable effect on the magnitude and temperature dependence of the lattice thermal conductivity and electrical resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004185105712
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  • 2
    Electronic Resource
    Electronic Resource
    Photogeneration of Donor Pairs in ZnSe{Ag} Crystals (2000)
    Springer
    Inorganic materials 36 (2000), S. 1200-1202 
    Details
    ISSN: 1608-3172
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experimental evidence is presented that photoinduced defect reactions in ZnSe{Ag} crystals give rise to the formation of (Ag0 i)2 interstitial donor pairs. As a result, the induced impurity photoconductivity spectrum shows, along with the band at 0.29 eV due to isolated Ag0 i atoms, a series of narrow bands in the range 0.3–0.6 eV (quasi-line spectrum). The energy positions and relative intensities of these bands are accounted for in terms of different pair separations in (Ag0 i)2 . The charge instability of Agi under band-gap excitation, associated with multiple electron trapping processes, leads to atomic instability, which gives rise to ionization-enhanced diffusion and the formation of (Ag0 i)2 donor pairs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026617328176
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    Paper (German National Licenses)
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