Abstract
A PRELIMINARY study has been made of the properties of a small piece of neptunium prepared elsewhere in these laboratories by a bomb reduction process. The principal impurities present in the metal were, by weight per cent, as follows: calcium, 0.34; uranium, 0.22; nickel, 0.06; magnesium, 0.03; chromium, 0.03; plutonium, 0.03; aluminium, 0.02; molybdenum, not more than 0.05; vanadium, not more than 0.06; figures for fluorine and oxygen, which were probably also present in small quantities, are not available. A powder photograph on unannealed filings agreed with that previously reported1 for the orthorhombic α-phase stable at room temperature.
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References
Zachariasen, W. H., Acta Cryst., 5, 660 (1952).
Tabor, D., “The Hardness of Metals” (Oxford, 1951).
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ELDRED, V., CURTIS, G. Some Properties of Neptunium Metal. Nature 179, 910 (1957). https://doi.org/10.1038/179910a0
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DOI: https://doi.org/10.1038/179910a0
