NEUTRON-DIFFRACTION STUDY ON THE MAGNETIC TRANSITIONS OF BCC CR80-XFE20MNX ALLOYS

A neutron-diffraction study has been performed on BCC Cr80-xFe20Mnx (x = 3.6 and 20.5 at %) alloys. The spectra show the occurrence of antif erromagnetic ordering and support the magnetic phase diagram of BCC Cr 80-xFe20Mnx alloys reported previously. The (100) superlattice magneti c reflection remains in the temperature regions of the ferromagnetic a nd the spin-glass states. The BCC fundamental peak heights and the lat tice parameter increase rapidly near the Neel temperature with decreas ing temperature.