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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oxidation of metals 30 (1988), S. 107-124 
    ISSN: 1573-4889
    Keywords: Corrosion ; phase-stability diagram ; reaction mechanism ; Cu-O-S system ; Ni-O-S system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The possible reactions of a pure metal with a multicomponent gas atmosphere containing binary compounds as X2, Y2, XiYj may be extensive. It is shown that even in this case, the phase-stability diagram for the M-X- Y system may be used to predict which product can exist in the complex scale built up during the oxidation of a pure metal at high temperature. Thus, a complete description of an atmosphere generated by SO2-O2-S2 mixtures may be given. On this basis, the Cu-O-S and Ni-O-S systems are examined, and the formation of sulfides Cu2S and Ni3S2 are explained.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: A field campaign was organized in September 2006 by Centro de Astobiologica (Spain) and Washington University (St Louis, USA) for the geological study of the Rio Tinto river bed sediments using a suite of in-situ instruments comprising an ASD reflectance spectrometer, an emission spectrometer, panoramic and close-up color imaging cameras, a life detection system and NASA's CheMin 4 XRD/XRF prototype. The primary objectives of the field campaign were to study the geology of the site and test the potential of the instrument suite in an astrobiological investigation context for future Mars surface robotic missions. The results of the overall campaign will be presented elsewhere. This paper focuses on the results of the XRD/XRF instrument deployment. The specific objectives of the CheMin 4 prototype in Rio Tinto were to 1) characterize the mineralogy of efflorescent salts in their native environments; 2) analyze the mineralogy of salts and oxides from the modern environment to terraces formed earlier as part of the Rio Tinto evaporative system; and 3) map the transition from hematite-dominated terraces to the mixed goethite/salt-bearing terraces where biosignatures are best preserved.
    Keywords: Geosciences (General)
    Type: Lunar and Planetary Science Conference; Mar 12, 2007 - Mar 16, 2007; Houston, TX; United States
    Format: application/pdf
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