A neutron-diffraction study of the tetragonal-monoclinic crystal structures of some uranium-thorium dicarbides |
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| Institution: | 2. Institute of Solid State Physics, TU Wien, Wien, Austria;1. Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996, USA;2. Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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| Abstract: | Crystal-structure line profile refinements have been made for neutron powder diffraction data collected at room temperature from the ternary uranium-thorium dicarbide U0.1Th0.9C2 and the two binary dicarbides UC2 and ThC2. U0.1Th0.9C2 is monoclinic, with unit cell dimensionsa = 6.630(2), b = 4.183(1), c = 6.690(2)A˚, β = 103.86(1)°, isostructural with ThC2, a = 6.684(2), b = 4.220(1), c = 6.735(2)A˚, β = 103.91(1)°. The tetragonal structure for UC2 is confirmed, witha = 3.522(1), c = 5.988(1)A˚. U0.1Th0.9C2 contains discrete C-C groups 1.297(8)A˚long; more precise values for C-C lengths have been determined for UC2 (1.322(4)A˚) and ThC2 (1.304(6)A˚). |
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