STRUCTURAL IDENTIFICATION OF THE NEW MAGNETIC PHASES FE3GA2-XASX

X-ray diffraction and Mössbauer studies have been used to identify precisely the crystal structure of recently discovered ferromagnetic alloys based on a series of Fe3Ga2-xAsx (0.21 ≤ x ≤ 1.125) alloys. In particular, it is shown that the change in structure from a B82 type to a more ordered variant which occurs with increasing gallium content at x ≈ 0.85, is consistent with an ordering process associated with vacant iron sites. Comparison is also made between the lattice spacing data of as-cast and homogenized alloys. © 1990.