Deuterium diffusion has been investigated in boron doped diamond as a function of the diffusion temperature and the boron concentration. The results show that, up to 480 deg, hydrogen diffusion is limited by the boron concentration with a diffusion activation energy of 0.35 eV for [B]=5x10~(19) cm~(-3). This first experimental evidence of deuterium-boron interactions in dimaond is interpreted as teh result of hydrogen ionization and diffusion of fairly mobile protons which form pairs with negatively charged boron acceptors.
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