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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Pressure-induced amorphization mechanism in Eu(2)(MoO(4))(3)

Résumé

We identify a mechanism responsible for amorphization of rare-earth molybdate isostructural compounds by means of x-ray absorption spectroscopy (XAS) and Raman spectroscopy as well as first-principles calculations. Our present Raman spectra show that both beta' and alpha-Eu(2)(MoO(4))(3) undergo a pressure-induced amorphization. Both first-principles calculations and XAS measurements explain the process of amorphization by a spatial self-reorganization of the oxygen clouds around the Mo and Eu subnetworks as the pressure is increased inducing a change in the coordination number of the Mo atoms. This latter transforms the eg crystal field of the tetrahedra into a series of stabilization-degenerated peaks, which energetically favors a disordered overlapping of the former MoO(4) tetrahedra instead of a mere ordered compression and rotation of these fragments

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Matériaux
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Dates et versions

hal-00640184 , version 1 (10-11-2011)

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Citer

O. Le Bacq, D. Machon, Denis Testemale, A. Pasturel. Pressure-induced amorphization mechanism in Eu(2)(MoO(4))(3). Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 83 (21), pp.214101. ⟨10.1103/PhysRevB.83.214101⟩. ⟨hal-00640184⟩
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