دانلود مقاله انگلیسی رایگان:Iron-wu¨stite revisited: یک کالیبراسیون تجدید نظر شده برای استوکیومتری متغیر و اثرات فشار - 2021
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  • Iron-wu¨stite revisited: A revised calibration accounting for variable stoichiometry and the effects of pressure Iron-wu¨stite revisited: A revised calibration accounting for variable stoichiometry and the effects of pressure
    Iron-wu¨stite revisited: A revised calibration accounting for variable stoichiometry and the effects of pressure

    سال انتشار:

    2021


    عنوان انگلیسی مقاله:

    Iron-wu¨stite revisited: A revised calibration accounting for variable stoichiometry and the effects of pressure


    ترجمه فارسی عنوان مقاله:

    Iron-wu¨stite revisited: یک کالیبراسیون تجدید نظر شده برای استوکیومتری متغیر و اثرات فشار


    منبع:

    ScienceDirect- Elsevier- Geochimica et Cosmochimica Acta, 313 (2021) 74-84: doi:10:1016/j:gca:2021:08:039


    نویسنده:

    M.M. Hirschmann


    چکیده انگلیسی:

    We present thermodynamic and empirical calculations for the iron-wustite (IW) buffer applicable from 100 kPa to 100 GPa and from 1000 to 3000 K. The thermodynamic calculation self-consistently accounts for changing stoichiometry of ironsaturated wu¨stite as a function of temperature and pressure. In contrast to some previous models for calculating IW at high pressure, the model incorporates a thermodynamically valid representation of the free energy of stoichiometric FeO at 100 kPa. Earlier high pressure models that relied on the JANAF thermochemical tables (Chase, 1998) were compromised because JANAF has erroneous values for the properties of FeO. This resulted in predicted oxygen fugacities buffered by IW that are between 0.2 and 1.1 log units too reducing at 3000 and 1000 K, respectively. The revised thermodynamic calculations indicate that iron-saturated wustite becomes more nearly stoichiometric with increasing pressure, but that this shift depends on temperature. Near-stoichiometric FeO (y < 0.01, for Fe1-yO) is reached close to 8 GPa at 1000 K and 17 GPa at 2000 K. An empirical function is presented that accurately reproduces the thermodynamic calculation and facilitates easy quantification of the fO2 of IW over the full range of temperatures and pressures covered by the model. Some caution is warranted in calculation of IW at high pressures, after FeO undergoes a transition from an insulator to a conductor and where low spin Fe2+ is stabilized, as the present model does not incorporate the effects of these transitions on the IW buffer.
    Keywords: Iron | Wustite | Oxygen fugacity | Buffer | Redox


    سطح: متوسط
    تعداد صفحات فایل pdf انگلیسی: 11
    حجم فایل: 1128 کیلوبایت

    قیمت: رایگان


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