Abstract
The high pressure behaviour of americium metal was reinvestigated by x-ray diffraction to 52 GPa. Phase Am III cannot be indexed in the monoclinic structure assigned to it previously. The resulting volumes are too large and would correspond to an expansion of the lattice by an increasing-pressure phase transition. This contradiction is lifted when Am III is indexed as a trigonal distortion of the cubic close packed Am II. A 6% volume decrease was observed on transition from Am III to Am IV. These findings complete the systematics of the high pressure transitions of the group of heavy actinide metals Am to Cf.
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Benedict, U., Itié, J.P., Dufour, C., Dabos, S., Spirlet, J.C. (1985). Delocalisation of 5f Electrons in Americium Metal under Pressure: Recent Results and Comparison with other Actinides. In: Edelstein, N.M., Navratil, J.D., Schulz, W.W. (eds) Americium and Curium Chemistry and Technology. Topics in f-Element Chemistry, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5444-1_16
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DOI: https://doi.org/10.1007/978-94-009-5444-1_16
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