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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure of the high Tc (107 K) superconducting phase in Pb-Bi-Sr-Ca-Cu-O (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2157-2158 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystal structure of the high Tc superconducting phase in a Pb-doped Bi-Sr-Ca-Cu-O system (nominal composition Pb0.3Bi1.7Sr2Ca3Cu4OY) with a zero-resistance temperature of 107 K was determined with transmission electron microscopy. The investigation shows that the crystal structure, which is different from the Pb-free one, is monocline with dimensions a=0.532 nm, b=0.383 nm, c=3.71 nm, α=β=90° and γ=134.8°. A distinct change of wave vector of incommensurate modulation was also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101516
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Atom positions in the R-phase unit cell in TiNi shape memory alloy (1996)
    Springer
    Journal of materials science 31 (1996), S. 4227-4231 
    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 A crystallographic analysis of the atom positions in the unit cell of the R-phase of the TiNi shape memory alloy has been performed. In addition to a homogeneous shape change the atoms are found to shuffle in the [111]B2 and 〈−211〉B2 directions during the B2 to R-phase transformation. The origin of these shuffles is found to be a complex interaction between 〈110〉〈1–10〉 transverse acoustic and 〈111〉 longitudinal acoustic soft phonon modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356443
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics of particle coarsening processes (1994)
    Springer
    The European physical journal 94 (1994), S. 353-358 
    Details
    ISSN: 1434-6036
    Keywords: 64.60.My ; 64.60.Qb ; 51.10+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A nonequilibrium statistical mechanical theory for particle coarsening processes is presented. In this theory, the rate of change of a given particle is determined by both a deterministic and a fluctuation terms, and the particle size distribution (PSD) satisfies Fokker-Planck-type equation. We use a time scaling technique and find the PSD scaled by average particle size as well as the power laws of time dependence of some quantities. The asymptotic scaled PSD is independent of initial condition but does depend on the equilibrium volume fraction. We show that the average radius grows att 1/3 and the density of particles decays ast −1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320690
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  • 4
    Electronic Resource
    Electronic Resource
    Voltage Relaxation and Its Influence on Critical Current Measurements (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 453-458 
    Details
    ISSN: 1572-9605
    Keywords: V-t curve ; I c measurement ; Ag-Bi2223 tapes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Based on the collective creep model, we numerically studied evolution of electric field and current density in superconductors and its influence on transport measurements of critical current. It is shown that many experimental facts, such as the dependence of V-I curves on sweeping rate of applied current and voltage relaxation are the results of this evolution. The simulation results are confirmed by electric transport measurements on Ag-sheathed Bi2−x Pb x Sr2Ca2Cu3O y tapes. Discussions on influences of the voltage relaxation on electric transport measurements including superconducting critical current are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007715411727
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    Paper (German National Licenses)
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