Volume 61, Number 6, March 2003
|Page(s)||783 - 789|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 March 2003|
Phase transition mechanisms in lanthanide elemental crystals
Group “Structure of Materials under Extreme Conditions”, SNBL/ESRF BP220, 38043 Grenoble Cedex, France
Accepted: 6 January 2003
A unifying theoretical description is given of the phase transition mechanisms occurring in lanthanide elemental crystals. The hcp-9R-dhcp-fcc sequence of reconstructive phase transitions is interpreted in terms of crossover between displacive and reordering mechanisms. The distorted fcc, monoclinic, α-U-type and bct high-pressure phases can be depicted by purely displacive mechanisms, the low symmetry of these phases resulting from the non-spherical shape of the electronic shells induced by the delocalization of the f-electrons.
PACS: 64.70.Kb – Solid-solid transitions / 81.30.Kf – Martensitic transformations
© EDP Sciences, 2003
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