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  • 2000-2004  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Structural Studies During Gelation of WO3 Investigated by In-situ Raman Spectroscopy (2000)
    Springer
    Journal of sol gel science and technology 18 (2000), S. 199-206 
    Details
    ISSN: 1573-4846
    Keywords: tungsten oxide ; sol-gel ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In the course of the preparation of WO3 by sol-gel technique we have studied kinetics of its synthesis and the structural changes during gelation. In-situ Raman scattering spectra were obtained for a series of samples during the transition from aqueous solution to gel. The changes in the Raman features were monitored as a function of time during gelation. The removal of water molecules affects the symmetric W=O stretching mode. The Raman spectrum of a gelified sample shows peaks attributed to the O–W–O bending mode and the disappearance of the high-frequency mode attributed to polyanionic species. After two days the gelified sample became a precipitated material, which exhibited the Raman spectrum of a crystalline tungsten oxide hydrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008775318802
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative determination of the 3D dipole orientation of single molecules (2004)
    Springer
    The European physical journal 28 (2004), S. 67-77 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Recently, different approaches have been implemented to detect single molecules with an optical dipole out of the sample plane. Principles to solve this problem of general interest have been laid but no detailed analysis has been performed to date. This paper is devoted to a quantitative analysis of the dipole orientation of out of plane molecules that we have detected by amplitude and phase masking of the input beam. The accuracy of the orientation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjd/e2003-00295-1
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    4-Volt cathode materials for rechargeable lithium batteries wet-chemistry synthesis, structure and electrochemistry (2000)
    Springer
    Ionics 6 (2000), S. 30-46 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Lithium transition-metal oxides used as intercalation compounds for rechargeable lithium batteries are widely studied in search of structural stability and improved electrochemical performance. Cathode materials belonging to the 4-volt class electrodes were synthesized by wet-chemistry methods, i.e., sol-gel, combustion or co-precipitation techniques. It is shown that synthesis greatly affects the electrochemistry and cycle life characteristics of the cathodes. Extensive damage including local strain variation, nanodomain formation, and changes in cation ordering, has been observed by local probes such as Raman and FTIR spectroscopy. In this work we wish to show the relationship between the local cationic environment and electrochemical characteristics of the 4-volt cathodes. Materials such as LiMn2O4, LiCoO2, LiNi1−yCoyO2, LiNi1−yCoyVO4, and LiMoVO6 are investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375545
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Structure, morphology and electrochemistry of doped lithium cobalt oxides (2000)
    Springer
    Ionics 6 (2000), S. 451-460 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The structure, morphology and electrochemical performance of LiCoO2 powders doped with various trivalent cations such as M3+=Ni3+, Al3+, and B3+ have been investigated. X-ray diffraction patterns and FTIR data show that LiCo1−yNiyO2 oxides display a solid solution in the whole range 0≤y≤1, while the solubility limit of LiCo1−yAlyO2 and LiCo1−yByO2 materials is about y=0.35. Electrochemical features of LiCo1−yNiyO2 cathode materials show remarkable stability in their charge-discharge profiles. Aluminum substitution also stabilizes the two-dimensional framework and induces an increasing average cell potential than for LiCoO2. The overall capacity of the LiCo1−yByO2 oxides has been reduced due to the sp metal substitution, however, a more stable charge-discharge cycling characteristic has been observed when electrodes are charged up to 4.4 V as compared to the performances of the native oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374166
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of the synthesis method on the structural and electrochemical properties of LiCo1−yNiyO2 oxides (2000)
    Springer
    Ionics 6 (2000), S. 434-441 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To optimize the LiCo1−yNiyO2 cathode materials, we have systematically studied the influence of synthesis parameters on their electrochemical behavior using powders synthesized by different wet-chemistry methods (combustion and sol-gel). It is found that the thermal decomposition behavior plays an important role on the intrinsic properties of the powders. Products were studied in details. Characterizations include compositional analysis, morphology, crystallographic structure, and local structure for LiCo1−yNiyO2 materials calcined at 800 °C. A comparison of the different methods is given for the synthesis of LiCo1−yNiyO2 cathode materials. It is found that well-structured oxides with uniformly sized ultrafine particles are obtained using the sol-gel method assisted by succinic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374164
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    Paper (German National Licenses)
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