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Structure and behavior of the barringerite Ni end‐member, Ni 2 P, at deep Earth conditions and implications for natural Fe‐Ni phosphides in planetary cores

Dera, Przemyslaw ; Lavina, Barbara ; Borkowski, Lauren A. ; Prakapenka, Vitali B. ; Sutton, Stephen R. ; Rivers, Mark L. ; Downs, Robert T. ; Boctor, Nabil Z. ; Prewitt, Charles T.

Journal of Geophysical Research: Solid Earth, March 2009, Vol.114(B3), pp.n/a-n/a [Tạp chí có phản biện]

ISSN: 0148-0227 ; E-ISSN: 2156-2202 ; DOI: 10.1029/2008JB005944

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  • Nhan đề:
    Structure and behavior of the barringerite Ni end‐member, Ni 2 P, at deep Earth conditions and implications for natural Fe‐Ni phosphides in planetary cores
  • Tác giả: Dera, Przemyslaw ; Lavina, Barbara ; Borkowski, Lauren A. ; Prakapenka, Vitali B. ; Sutton, Stephen R. ; Rivers, Mark L. ; Downs, Robert T. ; Boctor, Nabil Z. ; Prewitt, Charles T.
  • Chủ đề: Earth Core ; Phase Transitions ; Iron Alloys
  • Là 1 phần của: Journal of Geophysical Research: Solid Earth, March 2009, Vol.114(B3), pp.n/a-n/a
  • Mô tả: High‐pressure and high‐temperature behavior of synthetic NiP has been studied in a laser‐heated diamond anvil cell up to 50 GPa and 2200 K. Incongruent melting associated with formation of pyrite‐type NiP and amorphous Ni‐P alloy was found at an intermediate pressure range, between 6.5 and 40 GPa. Above 40 GPa, NiP melts congruently. At room conditions, NiP has hexagonal C22‐type structure, and without heating it remains in this structure to at least 50 GPa. With a bulk modulus = 201(8) GPa and ' = 4.2(6), NiP is noticeably less compressible than hcp Fe, as well as all previously described iron phosphides, and its presence in the Earth core would favorably lower the core density. In contrast to FeP, the / ratio in NiP decreases on compression because of the lack of ferromagnetic interaction along the direction. Lack of the C22→C23 transition in NiP rules out a stabilizing effect of Ni on the orthorhombic phase of natural (FeNi)P allabogdanite.
  • Số nhận dạng: ISSN: 0148-0227 ; E-ISSN: 2156-2202 ; DOI: 10.1029/2008JB005944

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