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  • 1990-1994  (8)
  • 1992  (8)
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  • 1990-1994  (8)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Critical current density of high-quality Bi2Sr2Ca2Cu3Ox thin films prepared by metalorganic chemical-vapor deposition (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2951-2957 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Critical current densities Jc were measured in as-deposited, c-axis-oriented Bi2Sr2Ca2Cu3Ox thin films with Tc values as high as 97 K, which were prepared by metalorganic chemical-vapor deposition. These films showed high Jc ((approximately-greater-than)109 A/m2) at 77.3 K in high magnetic fields (≥1 T, H(parallel)a-b plane). The best values are 3.3×109 A/m2 at 1 T and 9.1×108 A/m2 at 8 T, which are the highest Jc for Bi-oxide thin films among those reported so far. There were no signs of weak links in the Jc(H) behavior, and the surface morphology examined by scanning electron microscopy showed no apparent grain boundaries. The values of Jc decreased sharply when the applied field deviated from the a-b plane, and went to zero at the angles where the field component in the c direction is nearly equal to the irreversibility field Hc2* parallel to the c axis. The angular dependence of Jc of these films is most reasonably explained by the theory of intrinsic pinning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351499
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of stripe-direction dependence of threshold current density for AlGaInP laser diodes with CuPt-type natural superlattice in Ga0.5In0.5P active layer (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 737-739 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An anisotropy for threshold current densities for AlGaInP laser diodes with CuPt-type natural superlattice (NSL) in a Ga0.5In0.5P active layer, grown on a (001) GaAs substrate, was observed, for the first time. Threshold current densities (Jth) for laser diodes with stripes in the [1¯10] and [110] direction were 1.35 and 2.10 kA/cm2, respectively. The lasers with a weak NSL formation in the active layer showed a very small anisotropy in Jth. Stripe direction dependence of electroluminescence (EL) polarization properties were also observed for lasers with well-developed NSL. The anisotropies in Jth and EL polarization properties are attributed to the existence of the NSL in the active layer and the appearance asymmetry previously observed in the NSL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107782
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High-quality superconducting thin films of Bi 2 Sr 2 Ca 2 Cu 3 O x grown in situ by metalorganic CVD (1992)
    [s.l.] : Nature Publishing Group
    Nature 355 (1992), S. 327-328 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The BSCCO system has many superconducting phases with various values of Tc: examples of bulk materials are the high-Tc phase Bi2Sr2Ca2Cu3Ox ('2223') with Tc^ 110 K and the low-Tc phase Bi2Sr2CaCu2Ov ('2212') with TC = 80K. It is difficult, however, to obtain films of the high-Tc phase 2223. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/355327a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Destruction of metal-resin adhesion due to water penetrating through the resin (1992)
    Springer
    Journal of materials science 27 (1992), S. 5149-5153 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polymethyl methacrylate (PMMA) film bonded by 4-META dental adhesive resin to mild steel was used as a specimen to study the mechanism of water permeation into the adhesive interface. Degradation of the adhesion interface after immersion in water was investigated by measurement of peeling area after imposing thermal stress using liquid nitrogen. The amount of water penetrated at the interface was calculated from the solution to Fick's second equation. The degradation at the interface is discussed with respect to the water content. Water enters the interface by diffusion through the resin rather than by passage along the interface. The interface is broken by water when the water content at the interface reaches 48% of the equilibrium water concentration of PMMA. Observation through the PMMA film shows no change in the mild steel surface at 48% equilibrium water concentration; at 95% water content many small white spots appear on the surface. The surface colour gradually changes to black due to the formation of corrosion products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553383
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Destruction of metal-resin adhesion due to water penetrating through the resin (1992)
    Springer
    Journal of materials science 27 (1992), S. 5149-5153 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polymethyl methacrylate (PMMA) film bonded by 4-META dental adhesive resin to mild steel was used as a specimen to study the mechanism of water permeation into the adhesive interface. Degradation of the adhesion interface after immersion in water was investigated by measurement of peeling area after imposing thermal stress using liquid nitrogen. The amount of water penetrated at the interface was calculated from the solution to Fick's second equation. The degradation at the interface is discussed with respect to the water content. Water enters the interface by diffusion through the resin rather than by passage along the interface. The interface is broken by water when the water content at the interface reaches 48% of the equilibrium water concentration of PMMA. Observation through the PMMA film shows no change in the mild steel surface at 48% equilibrium water concentration; at 95% water content many small white spots appear on the surface. The surface colour gradually changes to black due to the formation of corrosion products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403808
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Chemical states of57Fe-atoms after ec-decay of57Co-labelled Co(BrO3)2·6H2O studied by coincidence Mössbauer spectroscopy (1992)
    Springer
    Hyperfine interactions 70 (1992), S. 1241-1244 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two kinds of time differential Mössbauer spectra of57Co-labelled Co(BrO3)2·6H2O were measured at room temperature by delayed coincidence technique, i.e., one was the delayed coincidence between 122 keV γ ray and 14.4 keV γ ray (γ, γ-ray coincidence), and another was the coincidence between 6.3 keV KX ray and 14.4 keV γ ray (X, γ-ray coincidence). The time dependence of chemical states of57Fe-species were observed on γ, γ-ray and X, γ-ray coincidence Mössbauer spectra. The relative area intensities of57Fe(II) observed on the X, γ-ray coincidence spectra were larger than those on the γ, γ-ray coincidence spectra on every time windows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397554
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Emission Mössbauer spectroscopic studies of57Fe atoms produced in57Co-labelled trinuclear cobalt-iron halogenoacetate complexes (1992)
    Springer
    Hyperfine interactions 70 (1992), S. 1237-1240 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mixed-valence states of57Fe atoms produced after EC-decay of57Co in a series of trinuclear cobalt-iron halogenoacetate complexes, [CoIIFe 2 III O(CH3−nXnCO2)6(H2O)3] (0≤n≤3, X=Cl, Br, and I), were studied by comparing the results obtained by emission Mössbauer spectroscopy with those observed in absorption Mössbauer spectra of analogous trinuclear iron complexes, [FeIIFe 2 III O(CH3−nXnCO2)6(H2O)3]. Some of the emission Mössbauer spectra show a temperature-dependent mixed-valence state as found in the absorption Mössbauer spectra. Others show a somewhat different temperature dependence compared with the absorption Mössbauer spectra. The results were interpreted in terms of after-effects of the EC-decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397553
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    121Sb Mössbauer spectroscopic study of a series of organoantimony(III) compounds (1992)
    Springer
    Hyperfine interactions 68 (1992), S. 197-200 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A systematic study of organoantimony(III) compounds, SbR3, was attempted in view of the effect on Mössbauer parameters of the substituent on the aromatic ring. The Mössbauer parameters obtained in frozen organic solutions reflected the electronic effect caused by the characteristics of the substituents, electron donative or attractive, at the para position on the aromatic ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396470
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    Paper (German National Licenses)
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