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    Examination of the Thermal Decomposition of Chrysotile

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    日付
    2005-04-22
    著者
    Crummett, Courtney
    Advisor
    Candela, Philip A
    Wylie, Ann G
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    The decomposition of pure chrysotile from Thetford, Quebec heated at constant temperature in air from 200-1000°C for 4 to 720 hours was studied by using X-ray diffraction and optical microscopy techniques. No morphological changes were observed optically below 450ºC and 24 hours, although X-ray diffraction data suggest that chrysotile degrades then recrystallizes below 450˚C. Throughout the temperature range of 500-1000ºC, changes in the refractive indices observed included several cycles of increasing and decreasing magnitudes and ranges. Chrysotile was no longer present above 575˚C and 24 hours. The lowest temperature of forsterite appearance was at 500˚C and 720 hours and the lowest temperature of enstatite appearance was at 800˚C for 8 hours. Broad reflections were observed within 500-750˚C at 16-8Å, 4Å, and 3Å spacings. These reflections suggested the possible presence of talc and tridymite-like mineral phases. X-ray diffraction and optical microscopy results of this study show that the decomposition of chrysotile is more complex than previously understood.
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    http://hdl.handle.net/1903/2485
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    • Geology Theses and Dissertations
    • UMD Theses and Dissertations

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    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
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