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  • 1
    Electronic Resource
    Electronic Resource
    Phase equilibria in the Fe-rich corner of the Nd-Fe-Ti ternary alloy system at 1100 °C : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6153-6155 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-temperature phase relations in the Fe-rich corner of the Nd-Fe-Ti ternary alloy system have been investigated and an equilibrium phase diagram has been constructed at 1100 °C. Arc-melted and annealed alloys of systematically varying compositions were characterized utilizing scanning electron microscopy, an energy dispersive x-ray microanalysis system (EDS), x-ray diffraction, and optical metallography. Three major phases have been identified, the well known Nd(Fe,Ti)12 "1:12'' (ThMn12-type structure) and Nd2(Fe,Ti)17 "2:17'' (Th2Zn17-type structure) compounds, and a phase with approximate composition Nd2(Fe,Ti)19 "2:19.'' The crystal structure of the latter phase has very recently been solved, and the "ideal'' composition shown to be Nd3(Fe,Ti)29 "3:29.'' Quantitative EDS data has been used to identify the compositional limits for the three major phases. Annealing the "1:12'' and "3:29'' ternary phases at 900 °C results in a slow decomposition into Nd2(Fe,Ti)17, Fe2Ti, and α-Fe(Ti).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358338
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  • 2
    Electronic Resource
    Electronic Resource
    Wide dynamic range current-voltage characterization system for ceramic superconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2044-2047 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Transport current-voltage (I-V) characteristics gathered over several orders of magnitude of current can reveal much about the loss mechanisms in high Tc superconductors. This article describes the design and implementation of a novel, computer-controlled, I-V characterization system which permits a I-V curve spanning five orders of magnitude of current to be captured in 50 ms. The advantages of this system over other methods of obtaining I-V curves are discussed. The system is applied to the study of high Tc superconductors and preliminary measurements are presented. Data obtained at 77 K for polycrystalline YBa2Cu3O7−δ are shown to be consistent with a I-V relation of the form, V=k(I−Ic)n, where Ic is the critical current, and k and n are constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143163
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A maximum entropy method for determining column-length distributions from size-broadened X-ray diffraction profiles (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 32 (1999), S. 600-613 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: We present a novel application of the maximum entropy (MaxEnt) method for solving the double-inverse problems of removing instrument broadening from X-ray diffraction profiles and calculating the column-length distribution of the crystallites. The MaxEnt approach is shown to have compelling advantages over the conventional methods it replaces: it is stable and robust, incorporates noise and a priori information into the solution, preserves positivity of the solution, and can be applied successively. We also show how uncertainties in the derived profiles and column distributions can be determined and used in subsequent calculations, including integral breadth, Fourier coefficients, column-length distributions and apparent particle sizes. Calculations are performed on simulated X-ray diffraction profiles for a range of particle sizes, with a detailed study of the sensitivity of the results to background-level estimates and the use of an incorrect instrument response function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889899000692
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  • 4
    Electronic Resource
    Electronic Resource
    Eigen-System Analysis of X-ray Diffraction Profile Deconvolution Methods Explains Ill-Conditioning (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 31 (1998), S. 453-460 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Several deconvolution methods common in X-ray diffraction profile studies have been examined using an eigen-system analysis in which an error-bound function is used to represent the maximum difference between the solution and true specimen profiles. This approach quantifies the sources of misfitting and ill-conditioning that appear in the solution profile and expresses them as a function of the control parameter for a particular method. A simulation of an instrument-broadened profile overlaid with random noise and background signals was used to evaluate the error-bound function for the iterative and constrained deconvolution methods, and the properties of the error-bound function were related to the features of the solution profile for each method. This analysis quantifies the terms that contribute to the ill-conditioning of the solution profile. It shows that, even for optimum values of the control parameters, positivity is not preserved and spurious oscillations are present in the solution profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897019638
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  • 5
    Electronic Resource
    Electronic Resource
    Induced moments in gadolinium intermetallics
    Amsterdam : Elsevier
    Physica B+C 86-88 (1977), S. 171-173 
    Details
    ISSN: 0378-4363
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4363(77)90274-1
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