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Effect of radiation-induced heat transfer on the temperature measurements in externally heated diamond anvil cells

The study of the thermal transport property of matter under extreme conditions is a significant but challenging task in the science community due to the unsatisfactory accuracy of heat flow characterization experimentally. In this work, a radiative-conductive coupled heat transfer model was proposed to resolve the heat transfer process inside a diamond anvil cell (DAC) under static heating conditions. The rationality of the model was verified via the characterization of the thermal conductivity of type Ia diamond. It is found that obvious error can come from the measurement of temperature by thermocouples in DAC. Based on this model, a temperature correction method with certain universality is presented for accurate temperature measurement by thermocouples in high-temperature experiments. The construction of the proposed model combined with the new correction method for temperature measurements may provide an efficient method for measuring potential thermal conductivity in a Bassett-type externally heated DAC.