We calculate the velocity surface of bulk acoustic waves propagating in the YZ-, XY-and ZX-planes of proton-exchanged LiNbO 3 , based on the theory of acoustic wave in anisotropic solid with piezoelectricity. The calculation results show that the velocity change due to proton-exchange when the wave propagating along X-axis is larger than that along Z-axis for Y-cut substrate, in spite of longitudinal or transverse wave. The curve of velocity surface for PE Z-cut substrate is near to a circle, while that for pure Z-cut LiNbO 3 is a hexagonal. The velocity surface for PE X-cut LiNbO 3 seems to be turned an angle from that for pure X-cut LiNbO 3. The detail results, discussions and comparison with the experiment will present in this paper.
The velocities of longitudinal and transverse waves for aluminum alloy 2024-T62 shocked by a high-power Nd: Glass laser are investigated by a laser ultrasonics method. The results show that the velocity of the longitudinal wave measured after the laser-shock processing increases at the center and decreases at the edge of the laser-shocked area (LSA). The maximum relative increase is 28% and the maximum decrease up to 10%, when compared with that measured before the alloy was shocked by laser processing. The velocity of the transverse wave decreases at any position within LSA, the maximum relative decrease being 13%. The decrease at the edge of LSA is larger than that at the center.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.