Measurement of thermal conductivity in laser-heated diamond anvil cell using radial temperature distribution

Kamil M. Bulatov, Alexander N. Semenov, Alexey A. Bykov, Alexander S. Machikhin, Konstantin D. Litasov, Pavel V. Zinin, Sergey V. Rashchenko

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Thermal conductivities of planetary materials under extreme conditions are important input parameters for modeling planetary dynamics such as accretion, geodynamo and magnetic field evolution, plate tectonics, volcanism-related processes etc. However, direct experimental measurements of thermal conductivity at extreme conditions remain challenging and controversial. Here we propose a new technique of thermal conductivity measurement in laser-heated diamond anvil cell (LH-DAC) based on radial temperature distribution around laser focal spot, mapped by imaging tandem acousto-optical tunable filter (TAOTF). The new technique provides much more information about heat fluxes in the laser-heated sample than existing static heating setups, and does not require dynamic numerical modeling using heat capacities in contrast to dynamic pulsed heating setups. In the test experiment, thermal conductivity of γ-Fe at conditions relevant to cores of terrestrial planets was measured.

Original languageEnglish
Pages (from-to)315-324
Number of pages10
JournalHigh Pressure Research
Volume40
Issue number3
DOIs
Publication statusPublished - 2 Jul 2020

Keywords

  • high pressure
  • iron
  • LH-DAC
  • TAOTF
  • Thermal conductivity
  • SYSTEM
  • REFRACTIVE-INDEX
  • SURFACE
  • IRON
  • EARTHS CORE

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