Abstract
FROM the results of radiochemical distribution experiments, M. Bruno and U. Croatto1 concluded that over a large range of temperatures promethium sesquioxide has a fluorite-type structure. We have examined a sample of promethium sesquioxide powder by means of X-ray diffraction and have found reflexions which are consistent with a fluorite-type structure. The promethium-147 oxide was about 99 per cent pure with the remaining impurity being the daughter, samarium-147. This oxide was prepared by heating promethium oxalate in air for 3 h at 750° C. About 15 mg of the oxide were placed in a lead sample holder, one end of which was closed by a film of ‘Cellophane’ tape through which the X-ray diffraction pattern was obtained by the use of a General Electric XRD-5 diffractometer.
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References
Bruno, M., and Croatto, U., Nature, 183, 601 (1959).
Strukturberichte, 2, 38 (1939).
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WILSON, A., ROBERTS, F. & WHEELWRIGHT, E. Promethium Oxide Structure. Nature 198, 580 (1963). https://doi.org/10.1038/198580a0
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DOI: https://doi.org/10.1038/198580a0
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