Thermal conductivity of ringwoodite under high compressive and tensile pressures

Abstract

A semi-empirical description of a volume–temperature dependence of thermal conductivity for nonmetal solids has been provided under high compressive and tensile pressures. This description is justified by the scaling law for high pressure isotherms of solids and by the theoretical Dugdale–MacDonald’s formula. The approach was tested on ringwoodite at high pressures. The equation of state of ringwoodite was constructed for the pressure interval−15 to+20 GPa and the temperature interval 300–1300 K. In this pressure–temperature region, the thermal conductivity of ringwoodite increases with pressures at a rate of ≈0.22 to 0.12 (W/mK)/GPa.

Keywords:

• High pressure
• Scaling law
• Equation of state
• Thermal conductivity
• Geophysics

Acknowledgements

This work was carried out under the financial support of the program of the Presidium Russian Academy of Sciences ‘Physics and Mechanics of Strongly Compressed Matter and Problems of Internal Structure of the Earth and Planets’.