Investigation of Fe_2YZ (Y=Ni, Cu; Z=Sn, Ga): Heusler Compounds With Tetragonal Structure

摘要

In recent years, the Heusler alloys have attracted much attention as promising materials in many fields, such as functional materials, thermoelectrics, superconductors, magnetic materials etc. Recently is reported a combinatorial study of Heusler alloys with the general chemical formula X_2YZ where the existence of two stable new tetragonal phases Fe_2CuGa and Fe_2NiSn were predicted. The attempt to synthesize the new phase is reported in this work. Fe_(2-x)MnxNiSn and Fe_2CuGa (x = 0, 1, 2) alloys were prepared by arc-melting and annealed at different temperatures in the region 873-1373K. Magnetic and XRD measurements were carried out. A new Heusler Fe_2CuGa phase was detected with very high magnetic moment of 171.4 Am~2/Kg.