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  • 78.70
  • Springer  (7)
  • Annual Reviews
  • 1980-1984  (7)
  • 1935-1939
  • 1981  (7)
Collection
Keywords
Publisher
  • Springer  (7)
  • Annual Reviews
Years
  • 1980-1984  (7)
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Positron annihilation in Ge-S glasses (1981)
    Springer
    Applied physics 26 (1981), S. 35-38 
    Details
    ISSN: 1432-0630
    Keywords: 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Positron lifetime and Doppler broadening measurements have been carried out on GeS1.375 and GeS1.5 glasses. A pronounced decrease of the mean lifetime was observed at crystallization of GeS1.375 glass into the GeS structure. Also the Doppler-broadened curves are strongly sensitive to this solid-solid phase transition. Unlike the situation for many metals, the positron annihilation parameters were found non-sensitive to fast neutron irradiation doses as high as 1019 n/cm2. No difference between positron annihilation parameters measured on GeS1.375 and GeS1.5 glasses was found. The state of the positron in the GeS glasses is discussed on the basis of these results. The idea is put forward, that the GeS-GeS2 system provides possibilities of sample parameter variations that might prove useful in the understanding of the positron state in non-metallic solids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197675
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  • 2
    Electronic Resource
    Electronic Resource
    Vacancy migration energy in quenched Al-Mg0.01 alloy by positron annihilation (1981)
    Springer
    Applied physics 26 (1981), S. 107-113 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 78.70
    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 isothermal recovery rates of vacancy-impurity complexes in an aluminium-1% magnesium alloy are measured in situ at eight temperatures from variations of colinear annihilation γ-rays versus time. These data analysed in terms of a time dependant β+-trapping model yield two apparent migration energies of 0.8 eV±0.1 eV and 0.9 eV±0.05 eV. The nature of the complexes is discussed and their binding energy is estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616657
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  • 3
    Electronic Resource
    Electronic Resource
    On the effect of backscattering of γ quanta and statistics in positron-annihilation lifetime measurements (1981)
    Springer
    Applied physics 26 (1981), S. 255-259 
    Details
    ISSN: 1432-0630
    Keywords: 29 ; 78.70
    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 contribution of backscattered, 1.27-MeVγ quanta to the coincidence counts in positron-annihilation lifetime measurements has been investigated. Depending on the energy window settings and geometry, as much as 20% of the coincidence counts was found to arise from backscattered events. Computer analysis of such spectra leads to erroneous results. Analysis of computer-generated lifetime spectra shows that good statistics is more important than good resolution power for the quality of the analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617847
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  • 4
    Electronic Resource
    Electronic Resource
    Ion implantation of58Co for positron-annihilation Doppler-broadening measurements (1981)
    Springer
    Applied physics 24 (1981), S. 67-69 
    Details
    ISSN: 1432-0630
    Keywords: 06.60 ; 78.70 ; 71.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A method using ion implantation of58Co to produce source-sample systems applicable to positron-annihilation Doppler-broadening experiments at elevated temperatures in metals is presented. In addition, a crucible and furnace assembly is described which has been used to study the solid and liquid states of Ni in conjunction with the present source-sample system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900401
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  • 5
    Electronic Resource
    Electronic Resource
    Lattice defects of V3Si single crystals studied by positron annihilation (1981)
    Springer
    Applied physics 25 (1981), S. 65-70 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 61.80
    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 positrons to point defects created by the irradiation of V3Si with neutrons is demonstrated. We found no indication of thermal vacancies by thermal equilibrium measurement up to 1273 K which indicates that the monovacancy formation enthalpy for V3Si isH 1V F ≧(1.84±0.14) eV. Investigations within the range of homogeneity for excess vanadium suppot the idea that substitutional defects are the dominating defect type, whereas for excess silicon a direct confirmation of existing structural vacancies as the dominating defect type is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935393
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of the vacancy formation energy for different sublattices of ordered β-CuZn alloy by positron annihilation method (1981)
    Springer
    Applied physics 25 (1981), S. 143-151 
    Details
    ISSN: 1432-0630
    Keywords: 78.70
    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 temperature dependence of positron annihilation has been investigated for samples of the ordered β-CuZn alloy with different crystallographic orientations. The results obtained have been interpreted on the basis of the extended trapping model. Analysis of the temperature dependence of the peak coincidence count gives the values of the free energy of formation for vacant sites, left by Cu- and Zn atoms equal 0.58±0.02 eV and 0.77±0.04 eV, respectively. The dependence of the vacancy formation energy on the long-range order parameter has not been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901287
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of the source on the resolution of a positron annihilation lifetime spectrometer (1981)
    Springer
    Applied physics 24 (1981), S. 29-31 
    Details
    ISSN: 1432-0630
    Keywords: 29 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A detailed study of the prompt resolution curve of a positron annihilation lifetime spectrometer shows that the isotope used as source has great influence on its shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900393
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