Structure of defect cascades in heavy ions-irradiated nickel by X-ray diffuse scattering

摘要

Single crystals of Ni were irradiated with 137 MeV xenon ions (Xe~(10+)) of fluences up to 4.9 x 10~(13) ions/cm~2 below 13 K. After the irradiation, the X-ray cryostat with the specimens was transferred from an irradiation chamber to the X-ray diffraction equipment below 20 K. The results of X-ray diffuse scattering near Bragg reflections at low temperature indicate that the defects are located in cascades and suggest that a small amorphous zone exists within the cascade region. By the thermal annealing at 40 K corresponding to the recovery stage I_A, the defects in the cascades rearrange.