< 110 > oriented Fe_(83)Ga_(17) alloy and Fe_(81)Ga_(19) alloy were prepared by directionally solidification method at growth rate of720 mm·h-1.Theatomic vacancies of directionally solidified Fe-Ga alloy were investigated by X-ray absorption fine structure spectroscopy and positron annihilation technique.It was found that after different heat treatments around temperature of 700 ℃,the bond length between Ga atoms and its first neighbors Fe atoms and the degree of order of Fe_(83)Ga_(17) alloys did not vary,...