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High-purity alpha-plutonium was studied by X-ray diffraction in a diamond anvil cell up to 62 GPa. A structural phase transition occurs around 40 Gpa. The high-pressure structure was indexed in a hexagonal lattice of space group P6(3)/m, Z = 8. The bulk modulus of alpha-plutonium was determined as B(0) = 43(2) Gpa, with a pressure derivative B(0)' = 15(2). It is difficult to explain the increase in symmetry, observed in this case and also in cerium and samarium, by a loss of itinerancy of the 5f electrons.

Additional information

Authors: DABOS-SEIGNON S, Institut Curie, Section de Physique et Chimie, Paris (FR);DANCAUSSE J P, CEA, Bagnols-sur-Cèze (FR);GERING E, Robert Bosch GmbH, Bamberg (DE);HEATHMAN S, JRC Karlsruhe (DE);BENEDICT U, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: 23. Journées des Actinides, Bühlerhöhe (DE), April 20-23, 1993
Availability: Text not available
Record Number: 199311085 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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