In this paper

the effect of annealing temperature and time on the morphology of Lithium aluminate （γ-LiAl02 ） were investigated. The crystal samples were annealed in box furnace. SEM and laser scanning confocal microscopy （LSCM） were employed to analyze the morphology and defects of crystal surface. The result shows that with the increase of annealing temperature （850 ℃） there will cause Li element volatilizing and decreasing of the surface quality of the γ-LiAl02 crystal. Appropriate annealing time （ 〈 20 rain） at suitable temperature can increase the crystal surface perfection and release the heat stress generated in the crystal growth. The regular diamond pat- terns were formed through acid etching before and after annealing with the same orientation in crystal surface. How- ever

the number of defect and the depth of defect increased for the annealed γ-LiAlO2 sample.