Abstract: The elastic properties of ?-LiAlO2 were reinvestigated with the aid of resonant ultrasound spectroscopy (RUS) at ambient conditions. A strong discrepancy of the elastic coefficients derived by RUS can be found from the experimental results from the literature, where c12 and c13 deviate from our results by up to 60% (46?GPa). In contrast to the experimental cij from the literature, we can recognize a good agreement between the elastic coefficients derived from RUS and the values using density functional theory. The dielectric permittivity was measured on large plane-parallel plates, and the piezoelectric stress coefficient e123=0.14Cm?2 was derived from RUS measurements at ambient conditions. The heat capacity between 4 and 398?K has been obtained by microcalorimetry using a relaxation calorimeter. The Debye temperature was derived from heat capacity measurements (?Cp=676?K) and RUS measurements (?elastic=688?K)

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