کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8915708 | 1641463 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase relationships of the system Fe-Ni-S and structure of the high-pressure phase of (Fe1âxNix)3S2
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The phase relationships of the Fe-Ni-S system at 15â¯GPa were studied by high pressure quench experiments. The stability fields of (Fe,Ni)3S and (Fe,Ni)3S2 and the melting relationships of the Fe-Ni-S system were determined as a function of Ni content. The (Fe,Ni)3S solid solution is stable in the composition of Ni/(Feâ¯+â¯Ni)â¯>â¯0.7 and melts incongruently into an Fe-Ni alloyâ¯+â¯liquid. The (Fe,Ni)3S2 makes a complete solid solution and melts incongruently into (Fe,Ni)Sâ¯+â¯liquid, whose structure was determined to show Cmcm-orthorhombic symmetry by in situ synchrotron X-ray diffraction experiments. The eutectic contains about 30 at.% of S, and its temperature decreases with increasing Ni content with a rate of â¼5â¯K/at.% from 1175â¯K. The density of the Fe-FeS eutectic composition (Fe70S30) liquid is evaluated to be 6.93â¯Â±â¯0.08â¯g/cm3 at 15â¯GPa and 1200â¯K based on the Clausius-Clapeyron relations and densities of subsolidus phases. The Fe-Ni-S liquids are a primary sulfur-bearing phase in the deep mantle with a reducing condition (250-660â¯km depth), and they would play a significant role in the carbon cycle as a carbon host as well as in the generation of diamond.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 277, April 2018, Pages 30-37
Journal: Physics of the Earth and Planetary Interiors - Volume 277, April 2018, Pages 30-37
نویسندگان
Satoru Urakawa, Ryota Kamuro, Akio Suzuki, Takumi Kikegawa,