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- W1794934896 abstract "Single crystals of Ga x In 1−x Se have been grown in our laboratory by the Bridgman method for x ≤ 0.20 and x ≥ 0.75. Reflectivity measurements in the far infrared, with [Formula: see text], have shown that these alloys have a two-mode behaviour except for x = 0.982 where only the GaSe-like oscillator is visible. A Kramers–Kronig analysis enabled us to obtain a first evaluation of the transverse optic (TO) and longitudinal optic (LO) frequencies of the observed modes. Aχ 2 fit of the reflectivity calculated from the factorized model of the dielectric constant produced a more accurate determination for these frequencies along with their respective damping constants and ε 0 and ε x . Reflectivity measurements for [Formula: see text] were made on indium-rich samples, but only in InSe were the results different from those for[Formula: see text]. These are interpreted as a contamination of the [Formula: see text] mode by the E′ modes, normally visible with [Formula: see text] A model proposed by Jahne for the behaviour of optical phonons in alloy systems is applied to this study and finally a review of the criteria for the one-mode and two-mode behaviour, applied to the Ga x In 1−x Se system, is given." @default.
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- W1794934896 date "1984-08-01" @default.
- W1794934896 modified "2023-09-25" @default.
- W1794934896 title "Infrared spectra of Ga<sub><i>x</i></sub>In<sub>1−<i>x</i></sub>Se" @default.
- W1794934896 doi "https://doi.org/10.1139/p84-100" @default.
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