THERMAL-CONDUCTIVITIES OF DENSE IRON-OXIDES

Thermal conductivities of dense pure hematite, magnetite, wustite and iron have been measured by the laser flash method in the temperature range from room temperature to 1553K. The relatively high thermal conductivities of dense pure hematite, magnetite and wustite at low temperature were found and these values decreased with increase of temperature. The thermal conductivity of wustite was half to fifth as large as that of hematite or magnetite. The results obtained were summarized in the form of an empirical equation k = 1/(AT + B). Thermal resistivities, defined by reciprocal thermal conductivity, of three iron oxides change linearly as a function of temperature up to Tammann temperature which is about half of melting temperature.