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  • Articles  (36)
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  • 78.70  (36)
  • 1975-1979  (36)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (36)
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  • Articles  (36)
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (36)
  • Physics  (36)
  • 1
    Electronic Resource
    Electronic Resource
    Crystallinity of pure silica glass studied by positron annihilation (1978)
    Springer
    Applied physics 16 (1978), S. 231-233 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.10 ; 81
    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 crystallinity of silica glass fused from Brasilian quartz is demonstrated by positron annihilation lineshape measurements using a high resolution Ge(Li)-detector as well as by positron lifetime measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885117
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Annihilation gamma-ray lineshape parameters (1977)
    Springer
    Applied physics 13 (1977), S. 365-369 
    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 S-parameter, introduced by MacKenzie et al., is now widely used to describe annihilation gamma-ray lineshapes recorded with Ge(Li) spectrometers. This paper discusses four descriptive parameters, their statistical properties and their sensitivity to positron trapping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882612
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  • 4
    Electronic Resource
    Electronic Resource
    A new positron source for positron annihilation lifetime experiments (1979)
    Springer
    Applied physics 18 (1979), S. 305-306 
    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 of Na22 to produce source-sample systems applicable to positron annihilation lifetime experiments at elevated temperatures in metals is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885519
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  • 5
    Electronic Resource
    Electronic Resource
    Positron trapping and self-diffusion activation energies in chromium (1979)
    Springer
    Applied physics 19 (1979), S. 149-152 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 66.30 F
    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 activation energy for self-diffusion in chromium is found to be 3.51±0.13 eV from positron trapping measurements. The 4.51 eV activation energy seen in tracer diffusion work is therefore ascribed to divacancies, theQ 2/Q 1 ratio being typical of the bcc refractory group. The positron data give 0.55 for the ratioH 1v M /H 1v F of vacancy migration and formation energies, in agreement with quenching data for tungsten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00932389
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  • 6
    Electronic Resource
    Electronic Resource
    Some investigations of moderators for slow positron beams (1979)
    Springer
    Applied physics 19 (1979), S. 247-255 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 82.65 ; 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Measurements were made on a low-energy positron beam apparatus in an attempt to increase the efficiency of the slow positron yield from radioisotopes. A study was made to sweep thermalized positrons to the surface of a silicon wafer with an applied electric field at 298 and 140 K. Temperature studies were also made on more conventional Pt and Pt+MgO powder moderators and the results are discussed. The role of the MgO powder has been clarified, though fundamental questions remain. The positron apparatus beam and relevant information regarding sources, temperature and magnetic fields are discussed in sufficient detail so that such a slow positron beam utilizing a “conventional” slow positron moderator could be easily duplicated for use in solid state studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900467
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  • 7
    Electronic Resource
    Electronic Resource
    Evidence for a positron-exciton insulator in alkali-halide crystals (1976)
    Springer
    Applied physics 10 (1976), S. 227-229 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 71.80
    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 angular correlation of annihilation photons for single crystals of 60% KCl-40% KBr solid solutions and X-irradiated NaBr crystals were measured. For 60% KCl-40% KBr samples the measurements of the angular correlation curves were carried out under an external magnetic field of 13.0 kG. The experimental data and theoretical estimations show that thermalized positrons, captured by free cation vacancies, form the positron centre of F4-type; if the positrons are localized near the complex defects, containing the cation vacancies, the formation of peculiar “positron-exciton complex” of the positronium-like type is realized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00897220
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  • 8
    Electronic Resource
    Electronic Resource
    Integrated source-specimen system for high-temperature positron annihilation experiments (1976)
    Springer
    Applied physics 11 (1976), S. 197-199 
    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 A technique to prepare metal specimens containing sealed positron sources which permit Doppler broadening and lifetime measurements up to high temperatures (close to the melting point in the investigated metals Cd, Au, Cu) is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00920606
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  • 9
    Electronic Resource
    Electronic Resource
    Positron lifetime as a function of grain size (1977)
    Springer
    Applied physics 12 (1977), S. 217-218 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 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 Published data on positron annihilation lifetime in copper as a function of grain size have been analyzed to show that there is a linear relationship between the internal grain boundary surface area, per unit volume,S v, and the positron lifetime, τ. The analysis indicates that grain boundaries are important in the trapping of positrons. It is suggested that the slope of the resulting straight line,dS v/dτ, can be used to determine the annihilation rate of the grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896153
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  • 10
    Electronic Resource
    Electronic Resource
    A study of mono and divacancies in Cu and Au by positron annihilation (1977)
    Springer
    Applied physics 13 (1977), S. 67-70 
    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 peak counting rate of the angular correlation curve was measured for Cu and Au in the temperature range between −196°C and 1200°C. The experimental data were analysed by means of the trapping model under consideration of positron trapping by mono-and divacancies and detrapping of positrons from monovacancies. Such an analysis leads to acceptable results for both monovacancy and divacancy parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890723
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