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Thermal diffusivity of palladium-hydrogen systems at room temperature using photothermal detection.

We report results of measurements on the thermal diffusivity, specific heat and electrical resistivity of hydrogenated-palladium samples. It is shown that repetition of the hydrogenation process with the same sample induces aging effects, which lead to erroneous results. The results for the thermal-property measurements on single-cycled palladium samples reflected a phase transition between a-PdH and P-PdH as the hydrogen concentration is increased.