Magnetic ordering

The ordering of magnetic moments in about 60 compounds containing M = Cr, M n, Fe, Co, Ni, Pd, rare earths or U is analyzed by the self-coordination nu mbers of nearest, second and third neighbor positions T-1, T-2, T-3 and the ratio r = y/x Of the equivalent positions x and remaining positions y. The plot of T-1, T-2 values for primitive cubic or hexagonal, face-centered or body-centered cubic lattices shows similar structures as in ordered alloys with small T-2 values for attractive interactions and large T-2 Values at repulsive interactions. The intermediate interactions with T-1, T-2 values at the border of the structure map can be described by structure families w ith a combination of structural units. (C) 2000 Elsevier Science B.V. All r ights reserved.