Abstract
A sample of Gd2O3 enriched to about 98% in the low absorbing isotope 160Gd was examined by neutron diffraction at temperatures from room temperature to 1.3°K. Measurements of the diffuse background scattering in the high and intermediate temperature patterns have been used to obtain the paramagnetic form factor as a function of sinθ/λ. The observed scattering cross section was converted to f2 values by assuming the full theoretical paramagnetic moment of g[J(J+1)]1/2 for Gd+3 and using this value to correct for the isotropic nonmagnetic part of the scattering. The form factor obtained in this manner is near the calculated Hartree-Fock free-atom form factor but appears to be slightly higher over most of the region out to sinθ/λ≅0.3 Å−1. Beyond this value, overlapping nuclear reflections in the powder pattern make it impossible to obtain usable values of the background intensity. Magnetic ordering of a complex antiferromagnetic nature appears at about 1.6°K but a large diffuse hump in the pattern remains to a few degrees above liquid-helium temperature. This hump never completely disappears at the lowest temperatures reached indicating the magnetic structure is by no means fully developed at 1.3°K.
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