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Capacity [mAhg -1 ] 700 600 500 400 25VL20-75C charge 25VL20-75C discharge pure Graphite charge pure Graphite discharge 300 0 10 20 30 40 50 Cycle number Fig. 2: Change of capacity after the first 50 cycles of 25VL20-75C powder sample pyrolysed at 1050 °C compared to pure graphite powder vs. Li/Li + . Conclusion and Outlook This finding indicates that the SiCN phase is an active phase in terms of lithium intercalation/deintercalation and that it is a promising candidate as protective layer on graphite, due to its chemical stability. Still unfavourable is the low coulombic efficiency due to the large specific surface area of the formed SiCN phase. Therefore future work will be focused on reducing the surface area to improve the electrochemical properties. Furthermore the influence of the amorphous SiCN layer on the capacity and chemical stability of other electrode materials like silicon and optimized carbon materials as well as on different electrolytes is of particular interest. - 82 -
Recent Advances in New Hard High-Pressure Nitrides Andreas Zerr 1 , Ralf Riedel 1 , Toshimori Sekine 2 , J. E. Lowther 3 , Wai-Yim Ching 4 , Isao Tanaka 5 1 Institut für Materialwissenschaft, TU Darmstadt, Petersenstr. 23, 64287 Darmstadt, Germany 2 Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan 3 DST-NRF Center of Excellence in Strong Materials and School of Physics, University of the Witwatersrand, P. O. Wits, 2050, Johannesburg, South Africa. 4 Department of Physics, University of Missouri-Kansas City, Kansas City, Missouri, 64110, USA 5 Department of Materials Science and Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501 Japan. Since the discovery of spinel nitrides in 1999, there is presently much effort in basic science to further develop advanced nitrides and electronic nitrides. Aim and scope of the research in this field is to synthesize novel nitrides for structural and functional applications. Silicon-based spinel nitrides combine ultra-high hardness with high thermal stability in terms of decomposition in different environments and are expected to show interesting optoelectronic properties. These features make spinel nitrides suitable for applications as cutting tools and light emitting diodes, respectively. The ultra-high pressure and temperature synthesis of spinel silicon nitride and germanium nitride on the one hand as well as the successful synthesis of tin nitride at ambient pressure on the other hand have caused an enormous impact on both basic science and technological development of advanced nitrides. Moreover, the novel phases of transition metal nitrides like Zr3N4 and Hf3N4 with Th3P4 structure as well as the recently published mono nitrides of Pt or Mo demonstrate the scientific potential of high pressure synthesis techniques in the field of materials science. Here, the state of the art and the progress in the field of novel hard materials based on nitrides and produced under high pressure are reviewed. Fig. 1: Spinel-type structure of γ-Si3N4 (left) with calculated electronic band structure (right). - 83 -
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ANNUAL REPORT 2 0 0 6 FACULTY OF MA
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Annual Report 2006 Faculty 11 Mater
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Preface The year 2006 of the Depart
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difference of numerical and analyti
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Institute of Materials Science Phys
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Research Projects Bulk Amorphous Al
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el Dsoki, C.; Landersheim, V. ; Kau
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Das, J.; Kim, K. B.; Xu, W.; Wei, B
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Staff Members Head Prof. Dr. Jürge
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Zhou L.; Rixecker G.; Aldinger F.;
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concerned with the synthesis and ch
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Publications Fleissner, A.; Schmid,
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• Surface analysis The UHV-surfac
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T. Mayer, U. Weiler, E. Mankel and
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Thin films The Thin Film division w
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Berky, W.; Gottschalk, S.; Elliman,
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Hessische Industriemüll GmbH). Due
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Technical Personnel Josef Kolb, Dip
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Research Projects Environmental sca
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Fig. 1: Aerial photo of the Lake Li
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Lithological Map of the Japanese Ar
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tower stripping, and therefore much
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Diffusion and reaction in micro- an
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Rift dynamics, uplift and climate c
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Geology, land use change and erosio
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The Effect of LiF Addition on the S
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In case of the undoped sintered B6O
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Microstructures in Omphacite and Ot
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Modelling phase-assemblage diagrams
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As an example, Fig. 2 shows the che
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MATERIALS SCIENCE Physical Metallur
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