Absorption Spectrophotometric and X-Ray Diffraction Studies of NdI3, NdOI and SmI3
A systematic study of the first five transplutonium halides and oxyhalides, using spectrophotometry and X-ray diffraction, has been in progress in our laboratory. One of the goals was to establish the trends and differences in the properties of these 4f and 5f compounds. During the investigation of americium and curium tri-iodides and comparison of their X-ray data with literature values  for the lanthanide tri-iodides, it became apparent: (1) that the lattice parameters for samarium tri-iodide were not in accord with those of other lanthanide tri-iodides; and (2) that a second crystal form of neodymium and samarium tri-iodide may exist. Thus, neodymium, samarium and other selected lanthanide tri-iodides were examined with the same investigative tools that have been used for the transplutonium halides.
KeywordsIodine Hexagonal Iodide Gadolinium Lanthanum
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