Abstract
The rare earth (RE) metals lanthanum, cerium, praseodymium, neodymium and samarium form hydrides REH ≈2.33 and deuterides RED ≈2.33 with a tetragonally distorted fluorite structure. X-ray investigations show a facecentred tetragonal arrangement of the rare earth cations and a lattice parameter ratio c a > 1 . Neutron diffraction studies of NdD 2.36 yield a tetragonal superstructure with c a > 2 and space group I4 1 md. The structure is related to the REH 2 (CaF 2) cell; some of the tetrahedral sites are vacant, but half or almost half of the octahedral sites are occupied by deuterium atoms in an ordered manner. These results are compared with those of other workers.
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