Physical-Mechanical Characteristics of Fe-Doped Boron

The influence of the concentration of iron (0.3 to 3.0 at.%) on the dislocation structure and physical-mechanical characteristics of boron has been studied. It was shown that Fe-doped boron is p-type. A hole concentration increase from 6+1017 to 2+1019 cm-3 leads to an increase of the absolute value of the dynamic shear modulus at room temperature from 175 to 190 GPa. The activation energy of the mobility of twin dislocations decreases from 1.30 to 0.75 eV, while those of partial dislocations decrease from 2.1 to 1.8 eV. The interaction energy of twin and partial dislocations with point defects also varies between 0.45 and 0.11 eV. Changes of the structure-sensitive properties observed in Fe-doped boron may be considered as being due to the formation of shallow donor or acceptor levels at defects like kinks on twin or partial dislocations