Observation of anisotropic thermal diffusivities in yz LiNbO3 using transient heat pulse diffusion measurement [SAW devices]

In previous reports, we proposed and studied a new technique to estimate acoustic wave velocities in various materials using the heat pulse diffusion measurement and estimated the acoustic wave velocity in a thin diamond film grown on Si and intrinsic Si wafer. We also tried a similar measurement on LiNbO₃. In this report we improved this technique and re-examined intrinsic Si and yz LiNbO₃ wafers used in the previous report. We find the evidence of the anisotropic diffusivities in LiNbO₃ for the first time