A High Pressure Distorted a-Uranium (Pnma) Structure in Plutonium

Details A High Pressure Distorted a-Uranium (Pnma) Structure in Plutonium A High Pressure Distorted a-Uranium (Pnma) Structure in Plutonium

2004-09-03

arxiv.org/abs/cond-mat/0409066v1

Physics

Condensed Matter

Materials Science

10pages,3 figures

Scientific paper

10.1016/j.ssc.2004.10.022

Under pressure many rare earths and actinide metals transform to a-U structure or its lower symmetry distorted forms. We have reinterpreted the diffraction data of Dabos et al for Pu (reference 4) and find that a Am IV type distorted a-U structure in Pnma space group can explain this for its high pressure phase. The structures of this phase and a-Pu are both shown to have a distorted hcp topology. The upturn in the atomic volume of Pu at 0.1 MPa can also be rationalized on the basis of this proposal

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