Thermal conductivities of molten alkali metal halides were measured by two kinds of laser flash methods for three-layered systems (metal disk/sample liquid/metal disk). One is to measure the temperature response at the front surface of the upper metal disk below which sample liquid layer was located, and the other is to measure the temperature response at the rear surface of the lower metal disk above which the sample liquid and the upper metal disk layers are present. The effect of radiation on the temperature response was explicitly taken into account. The thermal conductivities obtained by the two methods agreed with each other within the experimental precision, and the reproducibility of the data was within 10%. The thermal conductivities of molten alkali metal halides showed a weak negative temperature dependence. The corresponding-states correlation for the thermal conductivity was also presented using the data reported in the present work.

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