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A potential piezoelectric crystal LiAlO 2 with ͑100͒ orientation is grown by means of the Czochralski pulling method. The as-grown crystal is identified as a single phase with good uniformity by x-ray diffraction pattern. ͑001͒ Transmission electron microscope image showed a unique cross-hatched pattern which reveals a superlattice structure. Several cubic LiAlO 2 specimen, 10.0 mm ϫ 10.0 mmϫ 10.0 mm were manufactured to characterize its elastic properties. The time-based pulse-echo transmission technique was employed to measure the acoustic velocities of longitudinal and transverse modes. The elastic constants of LiAlO 2 were extracted from the acoustic velocity measurements at different propagation directions. It was found that the acoustic velocities of LiAlO 2 are much higher than the current piezoelectric crystals, including quartz, LiNbO 3 , and Langasite family materials.

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