1994 Volume 35 Issue 6 Pages 389-393
Crystallographic and magnetic properties of Ir–Mn–Sn alloys have been investigated by means of X-ray diffraction and magnetic analysis. It has been found that a new L21-type Heusler alloy of Ir1.8Mn1.2Sn exists in the Ir–Mn–Sn system in the composition range of Ir2−xMn1+xSn for 0.2<x<0.4. The lattice parameter of this system is from 0.6204 nm for x=0.2 to 0.6189 nm for x=0.4, the magnetic moment is from 3.2 to 2.6μB/Mn and the Curie temperature is from 342 to 265 K. The lattice parameter of the Ir1.8Mn1.2Sn compound is 0.6204 nm, magnetic moment 3.38μB/Mn at absolute zero degree and the Curie temperature 342 K. The magnetization and the Curie temperature of these alloys decrease with increasing x.
The C1 type ordered alloy has been obtained near the composition of equi-atomic ratio for a fairly wide composition range, but magnetic character are much different from the other ferromagnetic alloys of the C1-type.
