Material parameters of AlN and LiAlO2 single crystals

We have successfully grown high quality AlN piezoelectric single crystal by sublimation technique. Transparent and coloring from amber to dark brown (depending on growth temperature) crack-free boules of approximately 15 mm in diameter and 25 mm in length along [0001] direction were obtained. Full sets of material parameters of grown AlN and commercially available LiAlO
₂
bulk crystals were measured at room temperature. Temperature coefficients of the material parameters of LiAlO
₂
were also obtained in a temperature range from 200 K to 310 K.