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• W1981074920 abstract "High-pressure Raman scattering of type-III silicon clathrate ${mathrm{Ba}}_{24}{mathrm{Si}}_{100}$ has been measured up to $27phantom{rule{0.3em}{0ex}}mathrm{GPa}$ at room temperature. Low-frequency vibrational modes associated with Ba atoms inside three kinds of cages were found around $45--90phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$. The Si framework Raman bands were observed around $115--415phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, which are altogether shifted toward lower frequencies as compared to those of type-I ${mathrm{Ba}}_{8}{mathrm{Si}}_{46}$. High-pressure phase transition occurs at $6.5phantom{rule{0.3em}{0ex}}mathrm{GPa}$, which seems to be due to the structural distortion induced by the increasing guest(Ba)-host(Si) couplings. ${mathrm{Ba}}_{24}{mathrm{Si}}_{100}$ becomes irreversibly amorphous above $23phantom{rule{0.3em}{0ex}}mathrm{GPa}$. This pressure is lower than those of type-I Si clathrates, which suggests that type-III structure is less stable than type-I under high pressures." @default.
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• W1981074920 date "2005-03-30" @default.
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• W1981074920 title "High-pressure Raman study of the Ba-doped silicon clathrate<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi mathvariant=normal>Ba</mml:mi><mml:mn>24</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>Si</mml:mi><mml:mn>100</mml:mn></mml:msub></mml:mrow></mml:math>up to<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mn>27</mml:mn><mml:mspace width=0.3em /><mml:mi>GPa</mml:mi></mml:mrow></mml:…" @default.
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• W1981074920 doi "https://doi.org/10.1103/physrevb.71.094108" @default.
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