Thermal conductivity of La2CuO4, La2NiO4, and Nd2CuO4 in the semiconducting and metallic phases

Thermal conductivity of polycrystalline La₂CuO₄, La₂NiO₄, and Nd₂CuO₄ was measured in the temperature range 300–1000 K. No anomaly in thermal conductivity has been observed during the semiconductor-to-metal transition of La₂NiO₄ or in the metallic phases of La₂CuO₄ and La₂NiO₄. A change of slope has been found, however, in the thermal conductivity of La₂CuO₄ at the crystallographic transition. The thermal conductivity of the oxides is mainly phononic in this temperature range.