MAGNETIC-BEHAVIOR OF SOME MN1-XNIX AND (MN1-XNIX)(4)N SOLID-SOLUTIONS

The temperature dependence of the magnetic susceptibility between 100 and 850 K was measured for Mn1-xNix and (Mn1-xNix)(4)N solid solutions . The investigated samples were checked by metallographic microscopy a nd all were found as solid solutions. For Mn1-xNix solid solutions the magnetic susceptibility increases linearly with temperature increase, obeying the relation chi = aT + chi(0), which suggests a longitudinal spin fluctuation mechanism. The samples were heat treated in a nitro en atmosphere at 1173 K during 1 h. After the heat treatment, the samp les exhibited itinerant ferromagnetic behaviour associated with the fo rmation of the solid solution between Mn4N intermetallic compound and nickel, resulting in the system (Mn1-xNix)(4)N.