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  • 1990-1994  (33)
  • 1
    Electronic Resource
    Electronic Resource
    Refinement of atomic positions in bixbyite oxides using perturbed angular correlation spectroscopy (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 165-169 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768192007742
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  • 2
    Electronic Resource
    Electronic Resource
    Refinement of atomic positions in bixbyite oxides using perturbed angular correlation spectroscopy. Erratum (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 783-784 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768193005294
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  • 3
    Electronic Resource
    Electronic Resource
    Precision PAC measurements in Er2O3 and Ho2O3 single crystals and structure refinement (1994)
    Springer
    The European physical journal 93 (1994), S. 441-447 
    Details
    ISSN: 1434-6036
    Keywords: 61.10.My ; 61.66.Fn ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The structure of C-form Ho2O3 and Er2O3 single crystals and powder samples was investigated by the electric quadrupole hyperfine interaction of111In(EC)111Cd probe ions using the perturbed γ-γ angular correlation method (PAC). The resulting set of refined atomic coordinates is compared to X-ray data and used to calculate the orientations of the electric field gradients (EFG) which are reproduced by the PAC measurements in single crystals. The temperature dependence of the coordinates was measured for both substances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314248
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    TheN=47 shell model nucleus90Tc (1994)
    Springer
    The European physical journal 349 (1994), S. 105-113 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Tg ; 21.60.Cs ; 23.20.Js ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Lifetimes of high spin states in the nucleus90Tc have been measured via the fusion evaporation reactions58Ni(36Ar,3pn)90Tc at 140 MeV and58Ni(35Cl,2pn)90Tc at 120 MeV beam energy. The OSIRIS spectrometer as well as a new neutron-γ-coincidence setup were used to measure lifetimes in the 10−12-10−9 s range by the recoil distance Doppler-shift method. By means ofγ-multiplicity and neutron-gated spectra fifteen lifetimes wered-educed. The experimental branching ratios and transition probabilities are compared to predictions of shell model calculations in a restricted π(p1/2), π(g9/2), ν(p1/2), and ν(g9/2) configuration space. In most cases the agreement with the calculations using the Gross-Frenkel parameters is striking but the results for several yrare states very sensitively depend on the residual interaction used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291167
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  • 5
    Electronic Resource
    Electronic Resource
    Ion beam mixing and sputtering of Kr-irradiated TiN films measured with RBS, RNRA, and PIXE (1990)
    Springer
    Applied physics 51 (1990), S. 537-545 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.−j ; 68.48. ; 79.20.−m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thin titanium nitride films of 10–300 nm thickness were irradiated with 84Kr ions of 80–700 keV energy and fluences ranging from 1016 cm2 to 2×1017 cm2. Sputter yields (Y=0.4–1.0) and mixing rates (k=0.05–0.5 nm4) were determined using the depth profiling methods RBS, RNRA, and PIXE. While the sputter yields agree well with the modified Sigmund theory, the energy dependence of the mixing rates cannot be explained by standard models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324738
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  • 6
    Electronic Resource
    Electronic Resource
    Ion beam induced modifications of TiN and Ti films on Al-3% Mg substrates (1992)
    Springer
    Applied physics 54 (1992), S. 84-91 
    Details
    ISSN: 1432-0630
    Keywords: 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 Thin titanium nitride films (50–110 nm) deposited via magnetron sputtering on Al+3 wt.% Mg substrates were irradiated with Ar, Kr, and Xe ion beams at room temperature and with energies between 0.1–0.9 MeV. Sputtering yields and interface mixing rates were determined using Rutherford backscattering (RBS) as depth profiling method. The obtained TiN sputtering yields for Ar and Xe irradiation are found to be in good agreement with predictions of the Sigmund approach. A systematic study with Ar and Xe beams revealed a correlation of the mixing rate with the parameter d/R p, where d denotes the layer thickness and R p the mean projected ion range. The mixing data and Monte-Carlo calculations of the collision cascades elucidate the importance of focused recoil transport, especially in the case of Xe irradiations. The results from ion mixing experiments of titanium films (70–140 nm) on Al-3% Mg with 0.1–1.0 MeV Xe beams and 0.05–0.2 MeV Ar beams support these conclusions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348136
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Xenon-beam-induced atomic transport through Cr/Al and Cr2N/Al interfaces (1993)
    Springer
    Applied physics 57 (1993), S. 187-193 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.Jh ; 71.30.+h ; 79.20.Rf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Cr layers (60–75 nm) on Al substrates and Cr2N layers (40–120 nm) on Al+3 wt.% Mg substrates were irradiated at 80 K and 300 K with 150–900 keV Xe-ions. The ion-beam-induced interface mixing was analyzed by means of Rutherford Backscattering Spectrometry (RBS). Both systems exhibit fairly small mixing rates, with those of Cr/Al being enhanced at 300 K target temperature, due to radiation-enhanced diffusion. The observed interface broadening is compared with predictions of ballistic and thermal spike mixing models. The low-temperature mixing rates in the system Cr/Al are underestimated by the ballistic model, but are rather well reproduced by local spike models. Mixing in the Cr2N/Al system at both temperatures, on the other hand, seems to be rather well described by the ballistic model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331443
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  • 8
    Electronic Resource
    Electronic Resource
    Ion-beam-induced atomic transport and phase formation in the system nickel/antimony (1993)
    Springer
    Applied physics 57 (1993), S. 353-361 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 68.35 ; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Sb/Ni multilayers of 200 nm total thickness were ion-beam mixed with 900 keV Xe++ or 600 keV Ar++ ions using fluences up to 1016 ions/cm2. The formation of crystalline intermetallic phases was observed by X-ray diffraction (XRD). To investigate, on a microscopic scale, the mixing-effects the perturbed angular correlation (PAC) technique was applied using some 1012 implanted radioactive 111In ions. The different phases were identified in the PAC spectra by comparison with those taken for single-phase material of intermetallic Ni/Sb compounds and pure Ni and Sb. After the 111In implantation usually up to 50% of the probes are found with PAC-parameters typical for the single metallic layers. The rest of the probes showed a complex mixture of electric field gradients (EFG). During ion-beam mixing this fraction increased to 100%. In some experiments individual EFGs were resolved indicating the formation of crystalline NiSb and Ni5Sb2 intermetallic phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332289
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  • 9
    Electronic Resource
    Electronic Resource
    Ion-beam-induced atomic transport and phase formation in the system nickel/antimony (1993)
    Springer
    Applied physics 57 (1993), S. 343-351 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 68.35 ; 68.55
    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 report on the ion-beam mixing processes of Sb/Ni marker layers and bilayers under the irradiation of ions ranging from He to Pb, at 80 K and at room temperature. The concentration profiles are obtained by Rutherford backscattering spectroscopy with 900 keV α-particles. At 80 K, the bilayer mixing rates cannot be reproduced by purely ballistic mixing; the essentially linear scaling of the bilayer mixing rate with the energy F D deposited at the interface points to local spike formation. A transition to global spike formation seems to be visible for the Pb-irradiations. Additional mixing effects at 300 K are due to radiation enhanced diffusion and scale with √F D. The marker mixing rates at 80 K are reproduced by the ballistic mixing approach, but are equally well described by local spike models. High fluence Xe-irradiations of Sb/Ni bilayers lead to intermetallic phases in the interface region as verified by transmission electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332288
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  • 10
    Electronic Resource
    Electronic Resource
    The CoO/Co3O4 phase transition studied by PAC (1990)
    Springer
    Hyperfine interactions 59 (1990), S. 313-316 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine environment of111Cd nuclei formed in the radioactive decay of111In ions implanted into CoO was studied via the PAC method. The quadrupole coupling constants measured in isochronal and isothermal annealing treatments at various oxygen pressures were related to the initial stages of the CoO→Co3O4 phase transition and interpreted as the successive trapping of cation vacancies at the111In probe. The phase transition was confirmed by X-ray diffraction, RBS and a PAC measurement on111Cd in spinel type Co3O4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401236
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