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  • Chemistry  (2)
  • Geomagnetics  (1)
  • 1990-1994  (3)
  • 1
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Depth composition and chemical states of elements constituting the overlayers of Ni—xCr alloys (x = 0-30 at.%) passivated in borate buffer solutions (pH = 9.2) were determined as a function of the chromium bulk content of the alloy. Depth sputter profiling was performed using both Auger electron spectroscopy (AES) and low energy ion scattering spectroscopy (LEIS). Chemical bonding and (oxy-hydroxy) structures of alloying elements in the passive films were investigated by x-ray photoelectron spectroscopy (XPS). The electrochemical study mainly consists in establishing the cathodic reduction kinetics of the passive layers to characterize the resistance of the internal Cr2O3 barrier to reduction.Very thin films (less than 2.5 nm) were obtained in those conditions showing duplex structures where minor external nickel oxy-hydroxide layers are depicted covering an inner protective barrier mainly composed of chromium oxide Cr2O3. Only at high bulk chromium contents (〉 15 at.%) are complete Cr2O3 layers built at the interface with the metallic alloy. Beneath the film, in the underlying matrix, a metallic nickel enrichment combined with a chromium depletion is observed, which seems to confirm, as for Fe—Cr alloys, a mechanism by which Cr oxidizes preferentially in this medium during the first steps of the film growth.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: sulfur cyanides ; sulfur cyanide trifluoride ; sulfur dicyanide difluoride ; sulfinyl cyanide fluoride ; infrared ; Raman ; NMR ; uv ; mass spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Eigenschaften von Schwefelcyanidtrifluorid, SF3CN, Schwefeldicyaniddifluorid, SF2(CN)2, und Sulfinylcyanidfluorid, FS(O)CN.Schwefelcyanidtrifluorid, SF3CN, und Schwefeldicyaniddifluorid, SF2(CN)2, wurden hergestellt durch Methathese zwischen Schwefeltetrafluorid, SF4, und Trimethylsilylcyanid, (CH3)3SiCN, bei - 30°C. Die Umsetzung von SF3CN mit frisch sublimiertem Selendioxid, SeO2, führte zu Sulfinylcyanidfluorid. IR-, Raman, 19F-NMR-, UV und Massenspektren sowie einige physikalische und chemische Eigenschaften dieser neuen Verbindungen werden mitgeteilt.
    Notes: Sulfur cyanide trifluoride, SF3CN, and sulfur dicyanide difluoride, SF2(CN)2, have been prepared by metathesis between sulfur tetrafluoride, SF4, and trimethyl silyl cyanide, (CH3)3SiCN, at - 30°C. Treatment of SF3CN with freshly sublimed selenium dioxide, SeO2, lead to sulfinyl cyanide fluoride, FS(O)CN. IR, Raman, 19F-NMR, uv and mass spectra of the novel compounds are presented as well as some physical and chemical properties.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
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    Academic
    In:  San Diego, Calif., Academic, vol. 558, no. XVI:, pp. 1-14, (ISBN 3-9808493-1-7)
    Publication Date: 1991
    Keywords: Geomagnetics ; Textbook of geophysics
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