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It is observed that the activation energy values for hydrogen desorption from the MgH 2 covered with a surface layer of Mg(OH) 2 , which was ball milled in Ar, are somehow erratically scattered as a function of milling time and, on average, are higher than those observed after milling in H 2 . In contrast, the activation energy values of the samples milled in H 2 gradually...
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