Atomic clusters and phase transitions in the metastable -Ta phase between and

A. Arakcheeva; G. Chapuis

doi:10.1209/epl/i2004-10356-5

All issues

Volume 69 / No 3 (February 2005)

Europhys. Lett., 69 3 (2005) 378-384

Abstract

Issue		Europhys. Lett. Volume 69, Number 3, February 2005


Page(s)		378 - 384
Section		Condensed matter: structure, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i2004-10356-5
Published online		05 January 2005

Europhys. Lett., 69 (3), pp. 378-384 (2005)

Atomic clusters and phase transitions in the metastable $\mth{\beta}$ -Ta phase between $\mth{4.2}$ and $\mth{293}$ $\un{K}$

A. Arakcheeva and G. Chapuis

Ecole Polytechnique Fédérale de Lausanne, Institut de Physique de la Matière Complexe - BSP, 1015 Lausanne, Switzerland

Received: 19 July 2004
Accepted: 19 November 2004

Abstract

Atomic clusters were identified in the ground state of the non-equilibrium Ta phase (Frank-Kasper σ-structure type) at 15, 120 and 293 $\un{K}$ . The evolution of the clusters with temperature leads to two phase transformations at 65 and 150 $\un{K}$ which are related to the electrical and magnetic properties. The magnetic phase transition at 65 $\un{K}$ is associated with the magnetic symmetry group transformation $P4'_{2}/mn'm$ ( $<65$ $\un{K}$ ) to $P\overline{4}'$ ( $>65$ $\un{K}$ ). It is shown that β-U is also a two-component composite containing similar clusters. The nature of the stabilisation of β-Ta at the cathode is discussed.

PACS: 61.50.-f – Crystalline state / 61.66.Bi – Elemental solids / 64.60.My – Metastable phases

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