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  • 1
    Electronic Resource
    Electronic Resource
    Magneto-optical Kerr effect and optical properties of amorphous Co1−xSix (0.59≤×≤0.77) alloy films (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 85-87 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Kerr spectra and optical constants of amorphous Co1−xSix (0.59≤×≤0.77) alloy films were measured in the spectral range 1.6–3.5 eV. It was found that there is rather considerable Kerr rotation near the high-energy side of 3.5 eV for the films (0.67≤×≤0.75), and there is a maximum value of −0.35°, which is comparable with that of pure Co, at x=0.75. The considerable Kerr rotation was ascribed to the following two causes: (i) the finite, but nonzero, nondiagonal element of dielectric function; (ii) the large optical constant effect due to the appropriate diagonal element of dielectric function. These changes of dielectric function originated from the metal-to-semiconductor transition controlled by Si concentration. There may be potential magneto-optical application in blue light range for such kinds of material. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122959
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  • 2
    Electronic Resource
    Electronic Resource
    Pressure effects on Al89La6Ni5 amorphous alloy crystallization (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 4133-4135 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pressure effect on the crystallization of the Al89La6Ni5 amorphous alloy has been investigated by in situ high-pressure and high-temperature x-ray powder diffraction using synchrotron radiation. The amorphous alloy crystallizes in two steps in the pressure range studied (0–4 GPa). The first process, corresponding to simultaneous precipitation of fcc-Al crystals and the metastable bcc-(AlNi)11La3-like phase, is governed by a eutectic reaction. The second process corresponds to the transformation of a residual amorphous alloy into fcc-Al, Al11La3, Al3Ni, and as yet unidentified phase(s). The applied pressure strongly affects the crystallization processes of the amorphous alloy. Both temperatures first decrease with pressure in the pressure range of 0–1 GPa and then increase with pressure up to 4 GPa. The results are discussed with reference to competing processes between the thermodynamic potential barrier and the diffusion activation energy under pressure. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1332409
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallization in Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass under pressure (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3553-3555 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of pressure on the crystallization behavior of the bulk metallic glass-forming Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy with a wide supercooled liquid region has been investigated by in situ high-pressure and high-temperature x-ray powder diffraction measurements using synchrotron radiation. In the pressure range from 0 to 3 GPa, the crystallization temperature increases with pressure having a slope of 19 K/GPa, which can be explained by the suppression of atomic mobility. This observation is opposite to the results of W.H. Wang, D.W. He, D.Q. Zhao, and Y.S. Yao [Appl. Phys. Lett. 75, 2770 (1999)], reporting a decrease of the crystallization temperature under pressure in a pressure range of 0–6 GPa for the bulk glass Zr41Ti14Cu12.5Ni9Be22.5C1 alloy. Compressibility with a volume reduction of approximately 22% at room temperature does not induce crystallization in the Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk glass alloy. This indicates that the densification effect induced by pressure in the pressure range investigated plays a minor role in the crystallization behavior of this bulk glass alloy. The different crystallization behavior of the carbon-free and the carbon-containing glassy alloys has been critically assessed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1328375
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  • 4
    Electronic Resource
    Electronic Resource
    An ab initio study of methane activation on lanthanide oxide (1997)
    Springer
    Catalysis letters 49 (1997), S. 53-58 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ab initio MP2 calculations have been carried out to study the activation of methane on lanthanide oxide La2O3. O- and O2 2- are assumed to be the active species on the oxide surface. The possible roles of O2- and O2 4- on the oxide surface in C-H bond activation are also investigated. It is shown that the CH4 oxidative dehydrogenation occurs much more readily on O- and O2 2- than on O2- and O2 4-. The results indicate that O- and O2 2- are the active species and therefore support the O- and O2 2- mechanisms assumed for the reactions. The promoter compound containing Br- is found to be favorable for the methane activation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019040902099
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  • 5
    Electronic Resource
    Electronic Resource
    The microstructure and magnetic properties of nanocrystalline Fe100-xSix alloys (2000)
    Springer
    Applied physics 70 (2000), S. 75-78 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 75.50.Bb;85.42.+m;81.20.Ev
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Nanocrystalline Fe100-xSix (x≤25) alloys have been prepared by mechanical alloying. The crystallite size of the nanocrystalline FeSi alloys is about ten to fifteen nm. The individual crystallite separated by disordered grain boundaries has the structure of b.c.c. α-Fe. The Mössbauer patterns show that substitution of Si atoms for Fe ones is almost disordered in the nanocrystalline FeSi alloys. The saturation magnetization of the nanocrystalline FeSi alloys is slightly less than that of single-crystalline and polycrystalline FeSi alloys, whereas their coercive force and effective magnetocrystalline anisotropy constant are higher than those of the corresponding single-crystalline and polycrystalline FeSi alloys. The much higher coercive force and higher effective anisotropy of the nanocrystalline FeSi alloys may be related to the high strain in the grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050014
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