Abstract
We have made X-ray and neutron diffraction experiments and magnetic susceptibility measurements for γ-MnPd alloys. The alloy containing 10.5 at%Pd shows a face center orthorhombic structure with a=0.3839, b=0.3780 and c=0.3717 nm and a non-collinear antiferromagntic structure with μa=0, μb=1.26 and μc=2.14 μB/Mn atom at 10 K. The crystal distortion occurs from the orthorhombic structure to a tetragonal structure with c⁄a<1 at 320 K, and finally to a cubic structure at 430 K. Another alloy with 13 at%Pd shows a face centered tetragonal with a=0.3800 and b=0.3846 nm (c⁄a=1.012) at 293 K, and transforms to a cubic structure at 350 K. More Pd rich alloy with 15 at% shows [c] structure down to 27 K. A phase diagram for γ-MnPd alloy system with 8–17 at%Pd is proposed.
