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  • Articles  (19)
  • 61.70  (19)
  • Springer  (19)
  • Cambridge University Press
  • Molecular Diversity Preservation International
  • Nature Publishing Group
  • 2015-2019
  • 2010-2014
  • 1975-1979  (19)
  • 1965-1969
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (19)
  • Philosophy
  • Education
  • Geosciences
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  • Articles  (19)
Source
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  • Springer  (19)
  • Cambridge University Press
  • Molecular Diversity Preservation International
  • Nature Publishing Group
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (19)
  • Philosophy
  • Education
  • Geosciences
  • Physics  (19)
  • 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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  • 2
    Electronic Resource
    Electronic Resource
    Propagation of ultrasonic shear waves in γ-ray irradiated quartz crystals (1977)
    Springer
    Applied physics 13 (1977), S. 171-173 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 61.80 ; 62
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ultrasonic pulsed-echo patterns in AC-cut quartz crystals cooled to 4.2 K have been studied over the frequency range 0.2〈f〈0.6 [GHz]. The observed beats, superimposed on the exponential decay, have been identified as resulting from diffraction of the waves in the finite-size crystals. Furthermore, it has been found that irradiation with 1 MeV γ-rays yields samples with both a smaller attenuation constant and less pronounced beats. The significance of the reported results lies mainly in the potential application of the procedure of γ-ray irradiation, and subsequent bleaching with ultraviolet light, in order to obtain quartz crystals with improved acoustic patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882477
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Crystal forms of hillocks and voids formed by electromigration on ultrapure gold and silver wires (1977)
    Springer
    Applied physics 12 (1977), S. 341-345 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 66 ; 68.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hillocks and voids (vacancy crystals) which were formed by electromigration on ultrapure gold and silver wires, showed only the combined crystal forms {111} and {100}. These planes are identical with the equilibrium planes GI, calculated by Stranski and Kaishew for nonpolar substances under the assumption of only nearest neighbor interaction. Hillock and void nucleation occurred on crystal imperfections (heterogeneous nucleation). Hillocks and vacancy crystals (voids) on gold showed twin formation obeying the spinel law.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886036
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  • 5
    Electronic Resource
    Electronic Resource
    Positron trapping in indium (1977)
    Springer
    Applied physics 13 (1977), S. 51-54 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 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 positron annihilation lineshape was measured in indium in the temperature range between 74 K and the melting point (430 K). A model based on self-trapping of positrons and trapping by vacancies was fitted through the data. A vacancy formation enthalpy of (0.48±0.03) eV was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890720
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  • 6
    Electronic Resource
    Electronic Resource
    Positron study of the martensitic transformation in Fe-29.5at.%Ni (1977)
    Springer
    Applied physics 13 (1977), S. 105-106 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 64 ; 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 Precision measurements of positron lifetime spectra in Fe-29.5at.%Ni alloy specimens were performed to clarify the nature of the martensitic transformation in this alloy. The forward transformation did not introduce any defects which behave as strong trapping sites for positrons. On the other hand, the reverse transformation accompanied the production of defects, to which the positron lifetime is sensitive, maybe dislocations. From the present results, the nature of the transformation was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890729
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of doping and thermal vacancies on positron annihilation in semiconductors (1979)
    Springer
    Applied physics 18 (1979), S. 81-83 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 64 ; 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 effect of lattice defects on positron annihilation in semiconductors was studied. In silicon, any detectable doping effect could not be found. In germanium, the thermal equilibrium measurements of annihilation lineshapes showed no vacancy effect. From these experimental facts, the interaction of positrons with lattice defects was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935907
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  • 8
    Electronic Resource
    Electronic Resource
    Blistering of rhenium irradiated with 21keV helium ions (1978)
    Springer
    Applied physics 17 (1978), S. 89-97 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 68.20 ; 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 This paper describes blistering of rhenium following 21 keV He+-ion irradiation at temperatures between 300 K and 1200 K. Blistering starts at 300 K at a dose of 3×1017 ions/cm2. The most probable blister diameter varies from 4400 Å at 300 K to 10100 Å at 1200 K. The blister depth τ bl , the blister diameter φ bl and the blister heighth bi show a distribution. From the observations one could derive the following relationships:h bl = 0.35φ bl ; τ bl =3.43φ bl 2/3 . The erosion yieldE y due to blistering is function of doseE y =0.51 atoms/ion at 3×1017 ions/cm2,E y =0.56 atoms/ion at 6×1017 ions/cm2 andE y =0.14 atoms/ion at 3×1018 ions/cm2. The sputtering yieldS (21 keV) is estimated to be ∼0.1 atom/ion. The corresponding surface regression is 44Å at 3×1017 ions/cm2 and 1323 Å at 9×1018 ions/cm2. Surface regression has therefore little influence on the observations at low doses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885036
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of lattice deformations on the local, magnetic dipole field of interstitial sites in H.C.P. crystals (1979)
    Springer
    Applied physics 20 (1979), S. 29-35 
    Details
    ISSN: 1432-0630
    Keywords: 76 ; 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 It is shown that lattice deformations around interstitial atoms may give a significant contribution to the local magnetic dipolar field at the interstitial site. An analysis of the dipole field measured for mouns on octahedral interstitial sites in Co shows that 1/4 of the dipole field results from lattice deformations. The double force tensor of the muon is found to be nearly isotropic and of the order of magnitude of 4eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901783
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  • 10
    Electronic Resource
    Electronic Resource
    Disorders produced during high-current and high-dose phosphorus ion implantation in silicon (1979)
    Springer
    Applied physics 20 (1979), S. 225-229 
    Details
    ISSN: 1432-0630
    Keywords: 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 Transmission electron microscopy, optical reflection and channeling effect measurements are employed to investigate disorders in 30 keV, high dose (3×1016ions/cm2) and high current (≦5 mA) phosphorus as-implanted silicon with (111), (100), and (110) orientation as a function of temperature rise (100–850°C) by the beam heating effect during implantation. Temperature rise below 400°C results in continuous amorrphous layer formation. This contrasts with results of the recovery into single crystals for temperature rise samples above 500°C, regardless of wafer orientation. Secondary defects (black-dotted defects, dislocation loops and rodlike defects) are formed in singlecrystal recovery samples, having a deeper distribution in (110) wafers and a shallower distribution in (111) and (100) wafers. Rodlike defects observed in 850°C samples are of “vacancy” type and have the largest density in (110) wafers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886022
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