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  • 2005-2009  (1)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The capacitance of the Na2O–SiO2 glass was measured in situ during heat treatment at various frequencies, 20, 100, 1, 3, 10, and 30 kHz. It was found that the capacitance of the glass abruptly decreases after a certain duration. The glass was quenched at this stage. It was confirmed by the X-ray diffraction and transmission electron microscopy that this decrease of capacitance was associated with the formation of crystallites in the glass matrix. The size of crystallites was observed to be in the range of about 10 nm.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 391 (1972), S. 86-96 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Der Einfluß von Kupfer(II) auf die Kristallisation von α-FeOOHα-FeOOH wurde in mehreren Proben ohne und mit Zusatz von Cu(II)-Ionen (bis zu 5 Atom-%) unter bestimmten Bedingungen dargestellt und röntgeno-graphisch, durch BET, DTA und elektronenmikroskopisch untersucht. Durch Zusatz von 2,5 Atom-% wird die Kristallisation des α-FeOOH vollständig verhindert. Geringe Cu-Zusätze verzögern die Kristallisation. Das Wachsen der Partikel- und Kristallitgrößen von reinem und Cu-dotiertem α-FeOOH unterscheidet sich. Nach der Theorie des Autors wird der Einfluß der Cu2+-Ionen auf die Verzerrung des Koordinationsgitters diskutiert. Es besteht vermutlich ein Zusammenhang zür korrosionshemmenden Wirkung von Kupferzusätzen im Stahl.
    Notes: Various α-FeOOH samples have been prepared with or without addition of Cu(II) (0-5% Cu/Fe) and examined by X-ray diffraction, BET surface area determination, electron-microscopical observation and DTA. Doping with Cu in suitable amounts impedes completely the formation of α-FeOOH. The mechanism of growth, based on the changes of particle size and crystallite dimension, appears to be different between pure and Cu-doped α-FeOOH. The reason of the remarkable effect of Cu on the crystallization process of α-FeOOH is discussed. The effect of Cu is likely relevant to the role of Cu added to anticorrosive steel used in atmospheric environment.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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