Elastic and piezoelectric properties of AlN and LiAlO2 single crystals

We have successfully grown high-quality AlN piezoelectric single crystal using the sublimation technique. Transparent crack-free boules of approximately 15 mm in diameter and 25 mm in length along the [0001] direction were obtained, with coloring from amber to dark brown depending on growth temperature. Full sets of material parameters of grown AlN and commercially available LiAlO₂ bulk crystals were measured at room temperature. Temperature coefficients of the material parameters of LiAlO₂ were also obtained in a temperature range from -70 to +50??C.