Measurement of thermal diffusivity at high pressure using a transient heating technique

Pierre Beck (1) , Alexander F. Goncharov (1) , Viktor V. Struzhkin (1) , Burkhard Militzer (1) , Ho-Kwang Mao (1) , Russell J. Hemley (1)

1 Geophysical Laboratory [Carnegie Institution]

We describe a flash-heating procedure designed to measure thermal diffusivity of materials at high pressure and temperature in diamond anvil cells. This technique involves time-resolved radiometry combined with a pulsed IR laser source. Results for MgO, NaCl, and KCl are presented (to P=32 GPa and T=2600 K). These measurements agree with previous studies at low pressure and high temperature and enable to test models for the combined P-T dependence of thermal conductivity. This technique can be extended to a broader range of pressures and can be used to address a variety of problems in geoscience, planetary sciences, and materials science.

Keywords: CONDUCTIVITY; TEMPERATURES; MINERALS; SOLIDS; NACL

Pierre Beck, Alexander F. Goncharov, Viktor V. Struzhkin, Burkhard Militzer, Ho-Kwang Mao, et al.. Measurement of thermal diffusivity at high pressure using a transient heating technique. Applied Physics Letters, 2007, 91 (18), pp.181914. ⟨10.1063/1.2799243⟩. ⟨insu-00367354⟩