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• W1983882257 abstract "The high pressure stability of the silicon type-III clathrate Ba${}_{24}$Si${}_{100}$ has been studied by x-ray diffraction (XRD) up to a maximum pressure of 37.4 GPa. The high pressure behavior of this Si type-III clathrate appears to be analogous to the structural type-I parent Ba${}_{8}$Si${}_{46}$. An isostructural volume collapse is observed at $~$23 GPa, a value higher than for Ba${}_{8}$Si${}_{46}$ (13--15 GPa). The crystallinity of the structure is preserved up to the maximum attained pressure without amorphization, which appears to be in contradiction with the interpretation given in a Raman spectroscopy study [Shimizu et al., Phys. Rev. B 71, 094108 (2005)]. Nevertheless, the XRD analysis shows the appearance of a type-III disordered nanocaged-based crystalline structure after the volume collapse. Moreover, we find that the volume collapse transformation is (quasi)reversible after pressure release. Additionally, a low pressure transition first evidenced by Raman spectroscopy is also observed in our XRD study at 5 GPa: The variation of the isotropic thermal factors of Ba atoms shows a clear discontinuity at this pressure while the average positions of Ba atoms remain identical." @default.
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• W1983882257 date "2011-04-08" @default.
• W1983882257 modified "2023-10-17" @default.
• W1983882257 title "High pressure x-ray diffraction study of the volume collapse in Ba<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>24</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Si<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>100</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>clathrate" @default.
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• W1983882257 doi "https://doi.org/10.1103/physrevb.83.134110" @default.
• W1983882257 hasPublicationYear "2011" @default.
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