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  • 1
    Electronic Resource
    Electronic Resource
    Segregation effects in sol-gel zirconia-silica materials analyzed through their radial distribution functions (2000)
    Springer
    Materials research innovations 3 (2000), S. 205-211 
    Details
    ISSN: 1433-075X
    Keywords: Key words Radial distribution function ; X-rays diffraction ; Zirconia ; Silica ; Zircon ; Alcoxide ; Sol Gel method ; Annealing temperature ; Oxidation state ; Oxygen deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  A novel method to characterize segregation effects in silica-zirconia materials prepared by the sol-gel method through the alkoxide route is reported. These segregation effects were studied by using the Radial Distribution Function obtained from the X-ray diffractograms. The information obtained by this technique allows one to predict the spatial distribution of one of the oxides into the other as a function of the annealing temperature and the relative concentration of both constituents. Silica and Zirconia were chosen for preparing the alloys since Si and Zr have the same oxidation state and, in spite of both ions being of different atomic radius, they do not produce distortion in the oxygen sub-lattice (due to an oxygen deficiency) which could influence the spatial distribution of both cations into the lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100190050004
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermo-luminescence induced by gamma irradiation in sol-gel prepared zirconia–silica materials (2000)
    Springer
    Materials research innovations 4 (2000), S. 32-35 
    Details
    ISSN: 1433-075X
    Keywords: Key words Thermoluminesence ; Gamma irradiation ; Zirconia–silica ; Sol-gel ; Dosimeter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Zirconia–silica materials prepared by the sol-gel method at different compositions were gamma irradiated with a dosage of 40 Krads for different irradiation periods. The thermoluminescent (TL) emission was studied as a function of the zirconia for temperatures from 100 to 300 °C. Pure zirconia produces a strong TL signal, followed by 50% zirconia sample, while pure silica and the 5% zirconia sample show a weak TL signal. This means that there exists a self-inhibited process possible due, on the one hand to the segregation effects of both components, and on the other to the stabilization of either tetragonal or monoclinic zirconia phases. This effect opens the possibility to control the TL signal in a wide range of dosages allowing to use this system as a wide range dosimeter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100190000064
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Tin Precursor on the Catalytic Properties of Pt-Sn/Al2O3 Sol-Gel Prepared Catalysts (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 847-849 
    Details
    ISSN: 1573-4846
    Keywords: platinum-tin catalysts ; Pt-Sn sol-gel catalysts ; cyclohexane dehydrogenation ; n-hexane conversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tin-alumina supports were prepared by cogelation of aluminum tri-sec-butoxide and tetrabutyltin or tin tetrachloride. Aqueous or acetone platinum solutions were used for impregnation. The results show that the specific surface area and the acidity of the catalysts were only slightly modified by the metal precursors used. On cyclohexane dehydrogenation and n-hexane conversion, high selectivity to olefins and low cracking products were detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018362813843
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of tin precursor on the catalytic properties of Pt-Sn/Al2O3 sol-gel prepared catalysts (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 847-849 
    Details
    ISSN: 1573-4846
    Keywords: platinum-tin catalysts ; Pt-Sn sol-gel catalysts ; cyclohexane dehydrogenation ; n-hexane conversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tin-alumina supports were prepared by cogelation of aluminum tri-sec-butoxide and tetrabutyltin or tin tetrachloride. Aqueous or acetone platinum solutions were used for impregnation. The results show that the specific surface area and the acidity of the catalysts were only slightly modified by the metal precursors used. On cyclohexane dehydrogenation andn-hexane conversion, high selectivity to olefins and low cracking products were detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436949
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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