UCL  IRIS
Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at https://www.ucl.ac.uk/finance/research/rs-contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
The NiSi melting curve to 70GPa
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Lord OT, Wann ETH, Hunt SA, Walker AM, Santangeli J, Walter MJ, Dobson DP, Wood IG, Vočadlo L, Morard G, Mezouar M
  • Publication date:
    01/01/2014
  • Pagination:
    13, 23
  • Journal:
    Physics of the Earth and Planetary Interiors
  • Volume:
    233
  • Status:
    Published
  • Print ISSN:
    0031-9201
Abstract
The melting curve of NiSi has been determined to 70GPa 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 900K at 14GPa. The location of the B31+B20+L triple point has been constrained to 12±2GPa and 1550±100K and the B20+B2+L triple point to 28.5±1.5GPa and 2165±60K. On the basis of the in situ LH-DAC experiments the Clapeyron slope of the B20→B2 transition is estimated at -67MPaK-1. Extrapolation of the B2-NiSi liquidus to core-mantle boundary (CMB) conditions (135GPa) suggests the melting point of NiSi (3700±400K) will be only marginally lower than that of isostructural FeSi (4000±200K). Thus any (Fe,Ni)Si solid solution present within the D″ layer is expected to remain solid, with the possible exception of the very hottest region adjacent to the CMB. © 2014 .
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Author
Dept of Earth Sciences
Author
Dept of Earth Sciences
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by