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The melting curve of nickel up to 100 GPa explored by XAS

DOI: 10.1002/2017JB014807 DOI Help

Authors: Silvia Boccato (ESRF - European Synchrotron Radiation Facility) , Raffaella Torchio (ESRF - European Synchrotron Radiation Facility) , Innokenty Kantor (ESRF - European Synchrotron Radiation Facility; Technical University of Denmark) , Guillaume Morard (Institut de Mineralogie et de Physique des Milieux Condenses, Universite Pierre et Marie Curie) , Simone Anzellini (Diamond Light Source) , Ruggero Giampaoli (ESRF - European Synchrotron Radiation Facility; Politecnico di Milano) , Richard Briggs (ESRF - European Synchrotron Radiation Facility) , Alessandro Smareglia (ESRF - European Synchrotron Radiation Facility; Politecnico di Milano) , Tetsuo Irifune (Ehime University) , Sakura Pascarelli (ESRF - European Synchrotron Radiation Facility)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Geophysical Research: Solid Earth

State: Published (Approved)
Published: November 2017

Abstract: Precise knowledge of the melting temperatures of iron, nickel and their alloys at pressures of the deep Earth would allow us to better constrain the parameters used for the Earth's heat budget and dynamics. However, melting curves of transition metals at pressures approaching 100 GPa and above are still controversial. To address this issue, we report new data on the melting temperature of nickel in a laser-heated diamond anvil cell up to 100 GPa obtained by X-ray absorption spectroscopy, a technique rarely used at such conditions. We couple this for the first time to ex-situ analysis of the sample, providing a further validation of the melting criterion adopted here. Finally, a Simon-Glatzel fit to the melting data obtained in this work, combined with those obtained in the most recent X-ray diffraction experiments, gives math formula, defining the most up-to-date X-ray determined melting curve for Ni. This result confirms that Ni could be ignored in the discussion on melting properties and thermal profile of the Earth's core, as it should affect the Fe melting point by only 10-20 K at 90 GPa.

Journal Keywords: nickel; melting; Earth's interior; LH-DAC; XAS; Earth's interior: composition and state; Instruments and techniques

Subject Areas: Earth Science, Physics

Facility: ESRF

Added On: 04/12/2017 16:12

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