Twinning in boron-ion-irradiated bismuth single crystals subjected to mutually orthogonal electric and magnetic fields

The effect of electric pulses (duration 10⁻⁵ s and current density up to 60 A/mm²) and an external magnetic field (0.2 T) on the behavior of wedgelike twin ensembles in boron-irradiated bismuth single crystals was studied. The irradiation energy and dose were, respectively, 25 keV and 10¹⁷ ion/cm². When the crystals were exposed to the magnetic field, both irradiation and pulse application enhanced the mobility of twinning dislocations. An equilibrium condition for twinning dislocations in the irradiated material simultaneously subjected to the electric and magnetic fields was derived.