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  • 1990-1994  (11)
  • 1993  (11)
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  • 1990-1994  (11)
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  • 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
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Thermal neutron captureγ-ray spectroscopy of59Ni and61Ni (1993)
    Springer
    The European physical journal 345 (1993), S. 143-153 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ma ; 23.20.Lv ; 25.40.Lw ; 27.50.+ e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theγ-radiation emitted after thermal neutron capture in isotopically enriched58Ni and60Ni was measured at the ILL high flux reactor by means of Ge/NaI detectors operated in Compton suppression and pair spectrometer mode. The neutron binding energies were determined asB n (59Ni)=8999.15(23) keV and Bn(61Ni)=7820.07(20) keV; some 95% of the totalγ-ray fluxes through59,61Ni were assigned. Theγ-ray strength functions of the primary transitions and the level densities are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293337
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  • 7
    Electronic Resource
    Electronic Resource
    Identification and structure of high spin particle-hole states in89Mo (1993)
    Springer
    The European physical journal 344 (1993), S. 395-403 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Lv ; 27.50.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Particle-γ andγ-coincidences of the reaction58Ni(36Ar, 4pn)89Mo have been used to gain more information about high spin states in89Mo and to establish the yrast sequence up to 7.6 MeV excitation energy and probable spin 37/2 ħ. Spins and parities were assigned on the basis of DCO-ratios measured with the OSIRIS spectrometer and a large volume Ge detector placed at 162° to the beam. Furthermore, aγ-ray angular distribution experiment was carried out using the reaction58Ni(35Cl, 3pn)89Mo. As in the neighboring isotopes88Mo and90Mo, the positive-parity high-spin states can be grouped into shell model multiplets characterized by increasing seniorities of proton particles and neutron holes in the 1g9/2 shell. The negative-parity states can be explained with one nucleon moving in thep 1/2 orbit. The energies and wave functions of these states have been deduced by means of the shell model code RITSSCHIL. The 2584 keV (21/2+) is an isomeric state the mean life of which has been estimated from delayedγγ-coincidences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283194
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  • 8
    Electronic Resource
    Electronic Resource
    Electric field gradients of111Cd in the hexagonal (A-phase) La2O3 and Nd2O3 sesquioxides (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 959-964 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Perturbed angular correlation measurements of111In in hexagonal La2O3 and Nd2O3 yield well defined symmetric electric field gradients with coupling constantv Q =280 MHz (extrapolated) in La2O3 andv Q =269 MHz for Nd2O3 at room temperature. The coupling constant in La2O3 linearly decreases with temperature. The spectra of La2O3, strongly damped at RT, rise to full amplitude at 870 K indicating dynamical interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567447
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  • 9
    Electronic Resource
    Electronic Resource
    The electric field gradient at111Cd in vanadium oxides (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 965-970 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electric field gradient (efg) of111Cd in polycrystalline V2O5 was studied using perturbed angular correlation (PAC) spectroscopy, with the111In activity ion-implanted at 400 keV. Between the individual steps of an isochronal annealing program, a distinct efg (v Q 1=88.1(3) MHz, ν1=0.62(2)) was recorded the contribution of which increased with annealing temperature up to 74% at 870 K. Corresponding X-ray analysis of inactive V2O5 samples, which underwent the same annealing treatment, proved that the sample always stayed as V2O5. Since V2O5 has only one equivalent cation site, it is concluded that this efg belongs to111Cd at this site. Oxidation of a vanadium foil atT=675 and 800 K at $$p_{{\text{O}}_{\text{2}} } $$ =200 mbar also yielded this efg. From PAC measurements in VO2, two well-defined efg's were found above and below the metal-semiconductor transition at 340 K, which are tentatively attributed to the monoclinic and the tetragonal phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567448
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  • 10
    Electronic Resource
    Electronic Resource
    Monitoring positional changes in bixbyite oxides with perturbed angular correlation spectroscopy (1993)
    Springer
    Hyperfine interactions 80 (1993), S. 953-957 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The refinement of atomic positions with perturbed angular correlation spectroscopy for several isostructural sesquioxides M2O3 (M=Sc, In, Y, Yb, Dy, Ho, Gd, Sm) is presented. The experimental electric field gradients of111Cd residing at the two substitutional sites were reproduced by the simple point charge model with an accuracy of less than 1% by varying the coordinates (available from X-ray and neutron diffraction experiments) within their experimental uncertainty. In this way, for each oxide coordinates were obtained having an accuracy of 0.3 pm, which is typically five times better than that of available X-ray and neutron diffraction results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567446
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