Thermal conductivity of compressed H2O to 22 GPa: A test of the Leibfried-Schlomann equation

The Leibfried-Schlomann (LS) equation, a commonly assumed model for the pressure dependence of thermal conductivity Lambda, is tested by measurements on compressed H2O using a combination of the time-domain thermoreflectance method with the diamond anvil cell technique. The thermal conductivity of ice VII increases by an order of magnitude between 2 and 22 GPa, reaching Lambda approximate to 25 W m(-1) K-1. Over a large compression range of approximate to 4%-33%, the LS equation describes the pressure dependence of Lambda of ice VII to better than 20%.