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Neutron-diffraction measurements have been made on polycrystalline samples of UBe~3 and ThBe~3 at several temperatures between 10 and 250 K. Refinement of the powder patterns using the Rietveld method of profile analysis yields structural parameters in substantial agreement with previous work [space group OI, ; 8 U in 8(a); 8 Be(I) in 8(b); 96 Be(II) in 96(i)]. Values for the (y, z) coordinates of the 96 Be(II) are (0.1763, 0.1150) and (0.1745, 0.1129) for UBet3 and ThBet3, respectively. Theydoi:10.1103/physrevb.32.6042 pmid:9937850 fatcat:umjuiqf6qbc5xof46576rgc74e