کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6447570 | 1641508 | 2014 | 47 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The NiSi melting curve to 70Â GPa
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
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چکیده انگلیسی
The melting curve of NiSi has been determined to 70 GPa on the basis of laser-heated diamond anvil cell (LH-DAC) experiments in which changes in the gradient of temperature vs. laser power functions were used as the melting criterion. The melting curve was corroborated with in situ X-ray diffraction experiments in both the LH-DAC and multi-anvil press in which the appearance of liquid diffuse scattering in the diffraction patterns was used as the melting criterion. At all pressures, the NiSi melting curve is lower than that of FeSi, with the difference in melting temperature reaching a maximum of 900 K at 14 GPa. The location of the B31 + B20 + L triple point has been constrained to 12 ± 2 GPa and 1550 ± 100 K and the B20 + B2 + L triple point to 28.5 ± 1.5 GPa and 2165 ± 60 K. On the basis of the in situ LH-DAC experiments the Clapeyron slope of the B20 â B2 transition is estimated at â67 MPa Kâ1. Extrapolation of the B2-NiSi liquidus to core-mantle boundary (CMB) conditions (135 GPa) suggests the melting point of NiSi (3700 ± 400 K) will be only marginally lower than that of isostructural FeSi (4000 ± 200 K). Thus any (Fe,Ni)Si solid solution present within the Dâ³ layer is expected to remain solid, with the possible exception of the very hottest region adjacent to the CMB.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 233, August 2014, Pages 13-23
Journal: Physics of the Earth and Planetary Interiors - Volume 233, August 2014, Pages 13-23
نویسندگان
Oliver T. Lord, Elizabeth T.H. Wann, Simon A. Hunt, Andrew M. Walker, James Santangeli, Michael J. Walter, David P. Dobson, Ian G. Wood, Lidunka VoÄadlo, Guillaume Morard, Mohamed Mezouar,