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It is shown that voids are created in palladium by the introduction (H-to-Pd, atomic ratio 0·68) and subsequent removal (50°C) of interstitial hydrogen. At a given low pressure the dehydrogenated palladium sorbs more hydrogen than the original palladium sample. The quantities of this additionally sobbed hydrogen are too large to be attributed to the accessible surface area. Further evidence is cited to show that it corresponds to hydrogen chemisorbed onto the surface of voids.
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Lynch et al. (1973) studied this question.
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