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- W184564351 abstract "The mode behavior of long-wavelength optical phonons in the ternary phase $mathrm{Hf}{mathrm{S}}_{3ensuremath{-}x}{mathrm{Se}}_{x}$ has been investigated by Raman spectroscopy through the whole composition range $0ensuremath{le}xensuremath{le}3$. Previous studies on the parent compounds have shown that $stackrel{ensuremath{rightarrow}}{mathrm{k}}=stackrel{ensuremath{rightarrow}}{0}$ Raman-active modes can be classified according to largely rigid chain modes (group I), internal deformation chain modes (group II), and a stretching mode of the diatomic chalcogen ${X}_{2}$ pair within the chains (group III). A mixed one-, two-, and three-mode behavior is observed in the $mathrm{Hf}{mathrm{S}}_{3ensuremath{-}x}{mathrm{Se}}_{x}$ system, depending respectively on modes of group I, II, and III. This behavior reflects the quite different and specific atomic interactions governing these different groups. More precisely, the mode-number progression from group I to group III appears to be related to the corresponding shortening of the range of atomic interactions involved. In particular, three-mode behavior is observed for diatomic ${X}_{2}$ modes. This behavior results from vibrations of S-S, Se-Se, and S-Se pairs of chalcogen atoms covalently bound. The picture of diatomic $Xensuremath{-}{X}^{ensuremath{'}}$ ($X, {X}^{ensuremath{'}}=mathrm{S},phantom{rule{0ex}{0ex}}mathrm{S}mathrm{e}$) molecules is substantiated by an estimate of the S-Se mode frequency based on a molecular model, in good agreement with experimental data. In addition, we took advantage of one-mode behavior of group I to establish a one-to-one correspondence between compatible phonons in the pure end member crystals and thus resolve some discrepancies in mode assignment from different authors." @default.
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- W184564351 date "1982-11-15" @default.
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- W184564351 title "Raman scattering in the ternary phase<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>Hf</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>S</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Se</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W184564351 doi "https://doi.org/10.1103/physrevb.26.5694" @default.
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