EFFECT OF HIGH PRESSURE ON THE THERMOELECTRIC PROPERTIES OF C70 FULLERENE

Abstract

Research has been performed into baric dependences of thermo-EMF and thermal conductivity derivative of C70 crystalline fullerene at pressures up to 46 GPa and room temperature. Pressure were created in a chamber with conducting diamond anvils. Structural transformations were recorded by changes in thermo-EMF and thermal conductivity. The pressure ranges in which there is a significant change in the thermoelectric properties of fullerene C70 are determined. The nature of the baric dependences of thermo-EMF and thermal conductivity derivative indicates irreversible structural transformations at pressures of the order of 32 GPa, due to the destruction of the structure of fullerene molecules. At pressures above 32 GPa, the thermo-EMF values become close to zero. This may be due to the formation of graphite-like carbon.