The half-metallic,magnetic and electronic properties were studied using density functional theory.The results show that the magnetic moment and lattice constants increase with the increase of x,which is slightly different from Slater Pauling rules owing to the direct hybridization between transition metal atoms and the influence of sp electrons. The Fermi level of Ti_2Co_(1-x)Ni_xGa is just situated the middle of the minority-spin band gap,indicating the most stable half-metallic behavior.
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