Abstract
Neutron diffraction from a polycrystalline sample of 242Pu2O3 (La2O3 structure) has been used to solve the magnetic structure below TN=19 K. The magnetic unit cell requires a doubling in all three crystallographic directions of the chemical unit cell. Below 4 K the magnetic and chemical unit cells become identical. The moments point along the unique c axis at all temperatures below TN. The magnetic moment is 0.60(2)μB per Pu ion and the C2 coefficient in the Pu3+ form factor is 4.5(3). The value of the moment, its direction within the unit cell, and the C2 coefficients are all consistent with the ‖±3/2〉 Kramers doublet being the ground state of the Pu3+ ion.
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