High-pressure phase transformations, pressure-induced amorphization, and polyamorphic transition of the clathrate Rb6.15Si46 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2009

High-pressure phase transformations, pressure-induced amorphization, and polyamorphic transition of the clathrate Rb6.15Si46

Résumé

The type-I clathrate Rb6.15Si46 with partly empty cage sites has been studied up to 36 GPa using Raman spectroscopy, synchrotron x-ray diffraction in diamond-anvil cells, and ab initio total-energy and lattice-dynamics calculations. A first phase transition is observed at 13±1 GPa and a "volume collapse" transition within the clathrate structure is then observed at 24±1 GPa. Pressure-induced amorphization into a high-density amorphous (HDA) state occurs above P=33±1 GPa. The HDA form transforms into a low-density amorphous polymorph during decompression. During the compression study using angle dispersive synchrotron x-ray diffraction techniques we measured bulk modulus parameters for rocksalt-structured TaO, included adventitiously in the clathrate sample [K0=293(3) GPa and K′0=5.4(3)].
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Dates et versions

hal-00987602 , version 1 (06-05-2014)

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D. Machon, Pierre Toulemonde, P. F. Mcmillan, M. Amboage, A. Munoz, et al.. High-pressure phase transformations, pressure-induced amorphization, and polyamorphic transition of the clathrate Rb6.15Si46. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2009, 79, pp.184101. ⟨10.1103/PhysRevB.79.184101⟩. ⟨hal-00987602⟩
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