Antiphase domains are seen in single crystal gamma lithium aluminate (gamma-LiAlO(2)) with 16.7 nm periodicity in the < 110 > direction. Alternate domains have a 1/2  shift. Beta phase lithium aluminate (beta-LiAlO(2)) is seen to form on the surface of the as-received wafers with an epitaxial strain limited relationship with the bulk gamma phase. The orthorhombic beta phase aligns with the a and b axes (0.528 and 0.630 nm) matching with the tetragonal gamma phase's a and c axes (0.5168 and 0.6268 nm). The gamma and beta phases are seen to have different etch rates. The beta phase converts back to the gamma phase above 450 degrees C.
Journal of Applied Physics
Vanfleet, R. R.; Simmons, J. A.; Hill, D. W.; Chou, M. M. C.; and Chai, B. H., "Antiphase ordering and surface phases in lithium aluminate" (2008). Faculty Bibliography 2000s. 1084.