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  • Investigating the structural behaviour of transplutonium elements to a very high pressure via synchrotron radiation: Am0.5Cm0.5 alloy as an example

Abstract

The structural behaviour of an Am0.5Cm0.5 alloy has recently been investigated at the High-Pressure-ID30 beam line of the ESRF. The use of synchrotron radiation, diamond anvil cell and 2D detector has allowed us to collect very high quality diffraction patterns up to pressures of 65 Gpa. The atmospheric pressure double hexagonal close packed (P63/mmc) structure transforms around 10 Gpa to a face centred cubic (Fm3m) phase. Like for pure Am metal, we find that the pressure induced delocalisation of the 5f electrons in Am0.5Cm0.5 occurs in two distinct stages rather than a single step: at 21Gpa the cubic phase converts to a face centred orthorhombic structure, which transforms into a primitive orthorhombic structure (Pnma) at 45 Gpa. The latter phase is stable to at least 65 Gpa, the maximum pressure reached during our experiments. Work is presently underway to determine whether the elements Cm and Cf behave similarly under pressure.

Additional information

Authors: LE BIHAN T, European Synchrotron Radiation Facility, Grenoble (FR);HAIRE R G, Oak Ridge National Laboratory (US);HEATHMAN S, European Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe (DE);IDIRI M, European Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe (DE);LINDBAUM A, Vienna University of Technology (AT)
Bibliographic Reference: An oral report given at: Actinides 2001 International Conference. Organised by: Japan Atomic Energy Research Institute and Atomic Energy Society of Japan. Held in: Hayama (JP), 4-11 November 2001.
Record Number: 200214362 / Last updated on: 2002-02-15
Category: PUBLICATION
Original language: en
Available languages: en