Abstract
Energy evolution below 1°K has been observed in β-phase palladium hydride (formal composition Pd2H). The rate of evolution was strongly temperature-dependent below 0.1°K, but became temperature-independent between 0.1° and 1.0°K. It depended upon previous specimen history and was greatly reduced by annealing of the specimen below 50°K. For specimens kept below 1°K, the rate of energy production at a given temperature diminished with a half-life of about 8 h. The results are explained semiquantitatively as a (spectroscopically forbidden) nuclear-spin conversion in quasi-molecular PdH4 units left behind in small concentrations when the lattice is cooled through the rotational transition (at 55°K) of β-palladium hydride. The temperature-dependence below 0.1°K appears to result from limitation in the rate at which the lattice can remove the change in librational energy associated with the conversion process.
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