Electrical resistivity and thermal conductivity of hcp Fe-Ni alloys under high pressure: Implications for thermal convection in the Earth's core

Hitoshi Gomi, Kei Hirose

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We measured the electrical resistivity of Fe-Ni alloys (iron with 5, 10, and 15. wt.% nickel) using four-terminal method in a diamond-anvil cell up to 70. GPa at 300. K. The results demonstrate that measured resistivity increases linearly with increasing nickel impurity concentration, as predicted by the Matthiessen's rule. The impurity resistivity is predominant at ambient temperature; the incorporation of 5. wt.% nickel into iron doubles the electrical resistivity at 60. GPa. Such impurity effect becomes minor at high temperature of the Earth's core because of the resistivity "saturation". We also calculated that

Original languageEnglish
Pages (from-to)2-10
Number of pages9
JournalPhysics of the Earth and Planetary Interiors
Volume247
DOIs
Publication statusPublished - Aug 22 2014
Externally publishedYes

Fingerprint

Earth core
thermal convection
thermal conductivity
free convection
electrical resistivity
conductivity
nickel
impurities
iron
diamond anvil cell
iron alloys
anvils
ambient temperature
diamonds
saturation
cells
temperature

Keywords

  • Core
  • Electrical resistivity
  • High pressure
  • Iron-nickel alloy
  • Thermal conductivity

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Physics and Astronomy (miscellaneous)
  • Astronomy and Astrophysics

Cite this

@article{25b47ccb3a944873bc480de7034ccc96,
title = "Electrical resistivity and thermal conductivity of hcp Fe-Ni alloys under high pressure: Implications for thermal convection in the Earth's core",
abstract = "We measured the electrical resistivity of Fe-Ni alloys (iron with 5, 10, and 15. wt.{\%} nickel) using four-terminal method in a diamond-anvil cell up to 70. GPa at 300. K. The results demonstrate that measured resistivity increases linearly with increasing nickel impurity concentration, as predicted by the Matthiessen's rule. The impurity resistivity is predominant at ambient temperature; the incorporation of 5. wt.{\%} nickel into iron doubles the electrical resistivity at 60. GPa. Such impurity effect becomes minor at high temperature of the Earth's core because of the resistivity {"}saturation{"}. We also calculated that",
keywords = "Core, Electrical resistivity, High pressure, Iron-nickel alloy, Thermal conductivity",
author = "Hitoshi Gomi and Kei Hirose",
year = "2014",
month = "8",
day = "22",
doi = "10.1016/j.pepi.2015.04.003",
language = "English",
volume = "247",
pages = "2--10",
journal = "Physics of the Earth and Planetary Interiors",
issn = "0031-9201",
publisher = "Elsevier",

}

TY - JOUR

T1 - Electrical resistivity and thermal conductivity of hcp Fe-Ni alloys under high pressure

T2 - Implications for thermal convection in the Earth's core

AU - Gomi, Hitoshi

AU - Hirose, Kei

PY - 2014/8/22

Y1 - 2014/8/22

N2 - We measured the electrical resistivity of Fe-Ni alloys (iron with 5, 10, and 15. wt.% nickel) using four-terminal method in a diamond-anvil cell up to 70. GPa at 300. K. The results demonstrate that measured resistivity increases linearly with increasing nickel impurity concentration, as predicted by the Matthiessen's rule. The impurity resistivity is predominant at ambient temperature; the incorporation of 5. wt.% nickel into iron doubles the electrical resistivity at 60. GPa. Such impurity effect becomes minor at high temperature of the Earth's core because of the resistivity "saturation". We also calculated that

AB - We measured the electrical resistivity of Fe-Ni alloys (iron with 5, 10, and 15. wt.% nickel) using four-terminal method in a diamond-anvil cell up to 70. GPa at 300. K. The results demonstrate that measured resistivity increases linearly with increasing nickel impurity concentration, as predicted by the Matthiessen's rule. The impurity resistivity is predominant at ambient temperature; the incorporation of 5. wt.% nickel into iron doubles the electrical resistivity at 60. GPa. Such impurity effect becomes minor at high temperature of the Earth's core because of the resistivity "saturation". We also calculated that

KW - Core

KW - Electrical resistivity

KW - High pressure

KW - Iron-nickel alloy

KW - Thermal conductivity

UR - http://www.scopus.com/inward/record.url?scp=84945470420&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84945470420&partnerID=8YFLogxK

U2 - 10.1016/j.pepi.2015.04.003

DO - 10.1016/j.pepi.2015.04.003

M3 - Article

AN - SCOPUS:84945470420

VL - 247

SP - 2

EP - 10

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

SN - 0031-9201

ER -