Surface modification of LiNbO_3 and KTa_(1-x)Nb_xO_3 crystals irradiated by intense pulsed ion beam

摘要

In this work, we studied the surface modification of LiNbO_3 and KTa_(1-x)Nb_xO_3 irradiated by intense pulsed ion beam, which was mainly composed of H~+ (70%) and C~(n+) (30%) at an acceleration voltage of about 450 kV. The surface morphologies, microstructural evolution and elemental analysis of the sample surfaces after IPIB irradiation have been analyzed by scanning electron microscope, atomic force microscope, X-ray diffraction and energy dispersive spectrometer techniques, respectively. The results show that the surface morphologies have significant difference impacted by the irradiation effect. Regular gully damages range from 200 to 400 nm in depth appeared in LiNbO_3 under 2 J/cm~2 energy density for 1 pulse, block cracking appeared in KTa_(1-x)Nb_xO_3 at the same condition. Surface of the crystals have melted and were darkened with the increasing number up to 5 pulses. Crystal lattice arrangement is believed to be the dominant reason for the different experimental results irradiated by intense pulsed ion beam.