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  • 1990-1994  (1)
  • 1975-1979  (3)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Phase transformations and vacancy formation energies of transition metals by positron annihilation (1979)
    Springer
    Applied physics 20 (1979), S. 135-140 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 71.60 ; 61.70
    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 technique of the coincidence count rate at the peak of the angular correlation curve (CCR) in positron annihilation has been applied to the investigation of vacancy formation energies in thermal equilibrium in nickel, cobalt, and iron. The monovacancy formation energyE 1v/F has been determined to (1.55±0.05) eV and (1.34±0.07) eV for nickel and cobalt, and (1.60±0.10) eV for α-iron, and (1.40±0.15) eV for γ-iron, respectively. The structural phase transformations in cobalt (693 K) and iron (1183 K, 1663 K) are exhibited by discontinuities of the CCR. In the case of cobalt the CCR follows exactly the change of the thermal expansion at the transition temperature. The temperature dependence of the CCR in the prevacancy region is found to be proportional to the thermal expansion for all metals investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885934
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the sensitivity of positrons to electric fields and defects in MBE-grown silicon structures (1994)
    Springer
    Applied physics 58 (1994), S. 389-393 
    Details
    ISSN: 1432-0630
    Keywords: 71.65 ; 73.40.Lq ; 73.60.Fw ; 78.70.Bj
    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 sensitivity of the positron to the internal electric fields in good quality thin (≈100 nm) Molecular Beam Epitaxy (MBE)-grown layers is experimentally demonstrated. Both a thin intrinsic layer grown on a p-type substrate and a highly n-doped δ profile buried in intrinsic silicon form effective barriers to positron diffusion although no defects can be detected. We also extract, from a full treatment of the positron diffusion, a quantitative estimate of the concentration, below the detection limits of other methods, of large vacancy clusters in a thick (680 nm) film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323615
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Monovacancy formation energy in copper, silver, and gold by positron annihilation (1975)
    Springer
    Applied physics 6 (1975), S. 177-180 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Monovacancy formation energies in copper, silver, and gold have been deduced from the temperature variation of the peak counting rate in the angular correlation curve of positron annihilation radiation from these metals. The counting rate was temperature dependent over the entire temperature range, including temperatures so low that no trapping of positrons at vacancies is effective. At these temperatures the increase in counting rate results from thermal expansion of the lattice. By separating this thermal expansion effect from the vacancy trapping effect at higher temperatures, we obtained values for the monovacancy formation energyE 1v for copper, silver, and gold to 1.29±0.02 eV, 1.16±0.02 eV, and 0.97±0.01 eV, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883748
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Positron angular correlation measurements on single-crystal aluminum at various temperatures (1974)
    Springer
    Applied physics 5 (1974), S. 177-178 
    Details
    ISSN: 1432-0630
    Keywords: Positron annihilation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have tested the trapping model by comparing the temperature dependence of the peak and the tail of the angular correlation curve from single crystal aluminum. The integral over the tail decreased as the integral over the peak increased with temperature, in such a way that the same vacancy formation energy could be deduced from both integrals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928232
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    μ+SR diffusion studies at LAMPF (1978)
    Springer
    Hyperfine interactions 4 (1978), S. 838-843 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021947
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    Paper (German National Licenses)
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