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  • 2000-2004  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Local structure of silver clusters in the channels of zeolite 4A (2001)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 8 (2001), S. 557-559 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The Ag K-edge EXAFS measurements have been carried out at 50 K for fully Ag+-exchanged zeolite 4 A (Ag-4A) dehydrated at different temperatures under vacuum. In the Fourier transforms of the EXAFS oscillation the two distinct peaks appear around 2.2 Å and 3.0 Å, and a shoulder around 2.8 Å. The structural parameters (distance, coordination number and root mean square displacement) were derived by a three-shell (two Ag-O contacts and Ag-Ag contact) curve-fitting analysis. It is found that a silver cluster is formed with Ag-Ag distance 2.82 ± 0.02 Å and coordination number 4.9 ± 0.2. When the silver cluster is formed 6 Ag0 atoms and 8 Ag+ ions are arranged in a cubic closed-packed manner in the cage of the Ag-4A zeolite. The 8 Ag+ ions and 6 Ag0 atoms are confined in the framework of O atoms at distances of 2.28 ± 0.02 and 2.88 ± 0.02 Å, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049500012668
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of dissociation energy for ligand exchange reaction from EXAFS (2001)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 8 (2001), S. 680-682 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: EXAFS (extended X-ray absorption fine structure) experiments were performed at several different temperatures for a series of 3d transition metal ions (Cr3+, Fe3+, Fe2+, Ni2+, Co2+, Zn2+) in aqueous solutions. Anharmonic EXAFS analyses, which include up to third order cumulant, were carried out to study on the metal-oxygen bonding potential. According to the model in which the dissociation process is dominant for the ligand-water exchange reaction, the dissociation energy has been first evaluated from EXAFS in solution phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049500015934
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the local structure of the first and second shells in ordered and disordered Ni–Mn alloys (2001)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 8 (2001), S. 300-301 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The coordination numbers and the interatomic distances for 50, 75 and 80 at.% Ni-Mn alloys in ordered and disordered states are presented. A new method for determining the first and second nearest neighbor coordination numbers in a binary alloy is applied. It is shown that magnetic properties of these alloys depend on short range order in atomic arrangement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090904950001894X
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    Paper (German National Licenses)
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