Phase Stability and Magnetic Properties of L21-type Phase in the Co2YGa(Y= Ti, V, Cr, Mn and Fe) and Co2(V1-xMnx)Ga Alloys

摘要

Order-disorder transition temperatures from L21 to B2-type phase TtB2/L21 and the Curie temperatures TC of the Co2YGa (Y=Ti, V, Cr, Mn and Fe) and Co2(V1-xMnx)Ga alloys were investigated by electron probe microanalysis (EPMA), differential scanning calorimetry (DSC) and magnetic measurements. It was seen that the TtB2/L21 shows a minimum at Y = Cr, on the contrary, the TC monotonically increases with increasing the number of valence electron Zt. In the Co2(V1-xMnx)Ga alloys, both the TtB2/L21 and TC show a tendency to be higher than those of the Co2CrGa alloy.