Auflistung Naturwissenschaftliche Fakultät nach Autor/in "7130ebdf-e208-4513-b518-85d75581d140"

Auflistung Naturwissenschaftliche Fakultät nach Autor/in "7130ebdf-e208-4513-b518-85d75581d140"

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  • AC and DC Conductivity in Nano- and Microcrystalline Li2O : B2O3 Composites: Experimental Results and Theoretical Models 
    Indris, Sylvio; Heitjans, Paul; Ulrich, Markus; Bunde, Armin (Berlin : Walter de Gruyter, 2005)
    We report on impedance measurements of nano- and microcrystalline composites of the Li ion conductor Li2O and the ionic insulator B2O3 as well as their interpretation in the frame of percolation models. In the experimental ...
  • Enhanced conductivity at the interface of Li2O:B2O3 nanocomposites: Atomistic models 
    Islam, Mazharul M.; Bredow, Thomas; Indris, Sylvio; Heitjans, Paul (College Park, ML : American Physical Society, 2007)
    A theoretical investigation at density-functional level of Li ion conduction at the interfaces in Li2O:B2O3 nanocomposites is presented. The structural disorder at the Li2O(111):B2O3(001) interface leads to reduced defect ...
  • Fast dynamics of H2O in hydrous aluminosilicate glasses studied with quasielastic neutron scattering 
    Indris, Sylvio; Heitjans, Paul; Behrens, Harald; Zorn, Reiner; Frick, Bernhard (College Park, MD : American Physical Society, 2005)
    We studied the dynamics of dissolved water in aluminosilicate glasses with the compositions NaAlSi3O8⋅0.3H2O, NaAlSi3O8⋅1.3H2O and Ca0.5AlSi3O8⋅1.3H2O using quasielastic neutron scattering. As shown by near-infrared ...
  • High-resolution 27Al MAS NMR spectroscopic studies of the response of spinel aluminates to mechanical action 
    Šepelák, Vladimir; Bergmann, Ingo; Indris, Sylvio; Feldhoff, Armin; Hahn, Horst; Becker, Klaus-Dieter; Grey, Clare P.; Heitjans, Paul (Cambridge : Royal Society of Chemistry, 2011)
    The response of the local structure of various types of spinel aluminates, ZnAl2O4 (normal spinel), MgAl2O4 (partly inverse spinel), and Li0.5Al2.5O4 (fully inverse spinel), to mechanical action through high-energy milling ...
  • Local electronic structure in a LiAl O2 single crystal studied with Li7 NMR spectroscopy and comparison with quantum chemical calculations 
    Indris, Sylvio; Heitjans, Paul; Uecker, Reinhard; Bredow, Thomas (College Park, ML : American Physical Society, 2006)
    The local electronic structure of a γ−LiAlO2 single crystal was investigated with 7Li nuclear magnetic resonance measurements. We observed different sets of spectra which originate from the four crystallographically ...
  • Local electronic structure in MgB2 from 12B β-NMR 
    Indris, Sylvio; Heitjans, Paul; Hattendorf, J.; Zeitz, W.-D.; Bredow, Thomas (College Park, ML : American Physical Society, 2007)
    We performed β-NMR spectroscopic studies on 12B which was implanted into MgB2 to get insight into the local electronic structure of this high-temperature superconducting material. By measuring electric field gradients we ...
  • Nanocrystalline versus microcrystalline Lo2O:B2O 3 composites: Anomalous ionic conductivities and percolation theory 
    Indris, Sylvio; Heitjans, Paul; Roman, H. Eduardo; Bunde, Armin (College Park, ML : American Physical Society, 2000)
    We study ionic transport in nano- and microcrystalline (1−x)Li2O:xB2O3 composites using standard impedance spectroscopy. In the nanocrystalline samples (average grain size of about 20 nm), the ionic conductivity σdc increases ...
  • Nonequilibrium structure of Zn 2SnO 4 spinel nanoparticles 
    Šepelák, Vladimir; Becker, Sebastian M.; Bergmann, Ingo; Indris, Sylvio; Scheuermann, Marco; Feldhoff, Armin; Kübel, Christian; Bruns, Michael; Stürzl, Ninette; Ulrich, Anne S.; Ghafari, Mohammad; Hahn, Horst; Grey, Clare P.; Becker, Klaus-Dieter; Heitjans, Paul (Cambridge : Royal Society of Chemistry, 2012)
    Zinc stannate (Zn 2SnO 4) nanoparticles with an average size of about 26 nm are synthesized via single-step mechanochemical processing of binary oxide precursors (ZnO and SnO 2) at ambient temperature, without the need for ...
  • Single-crystal neutron diffraction on γ-LiAlO2: Structure determination and estimation of lithium diffusion pathway 
    Wiedemann, Dennis; Indris, Sylvio; Meven, Martin; Pedersen, Björn; Boysen, Hans; Uecker, Reinhard; Heitjans, Paul; Lerch, Martin (Berlin : Walter de Gruyter, 2016)
    γ-Lithium aluminum oxide is a paradigmatic example of an ultraslow lithium ion conductor. This characteristic plays a crucial role in its proposed and actual applications. Herein, we report on the outcome of single-crystal ...
  • Solid-State Diffusion and NMR 
    Heitjans, Paul; Indris, Sylvio; Wilkening, Martin (Leipzig : Universität Leipzig, 2005-09-24)
    Diffusion in solids, which requires the presence of crystal defects or disorder, has both microscopic and macroscopic aspects. Nuclear magnetic resonance techniques provide access to microscopic diffusion parameters like ...

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