Hydrogen in mechanically milled amorphous boron

Abstract During mechanical milling under hydrogen atmosphere, hydrogen can be absorbed in amorphous boron, the amount reaching about 2.3 mass% (∼BH 0.25 ) after 80 h milling. The trapped hydrogen can be desorbed only as molecular hydrogen in a temperature range of 330–1000 K. Three types of B–H interaction, i.e. physisorbed H 2 , B–H terminal and B–H–B bridge bonds, were suggested to account for the desorption behaviors.