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The mechanism of hydrogen generation during the mechanochemical treatment of biotite was examined by grinding experiments using a ball mil in H 2 O or D 2 O as a grinding media. From the linear relationship between the amount of generated hydrogen and the increase of the surface area of ground powders, the hydrogen productivity of biotite is estimated to be 0.036 μmol/m 2 , which agrees with the previous results in spite of the difference in the grinding conditions. D 2 analyses by a massdoi:10.1186/bf03353346 fatcat:qnjuoph6xrhe7j2jl4js2luce4