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Determining alloy composition in MoxW(1 − x)S2 from low wavenumber Raman spectroscopy

Mixed alloy MoxW(1 − x)S2 (0 ≤ x ≤ 1) bulk samples are characterized by low wavenumber Raman spectroscopy

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Livneh, T; Dumcenco, DO; Pinkas, I

Mixed alloy MoxW(1 − x)S2 (0 ≤ x ≤ 1) bulk samples are characterized by low wavenumber Raman spectroscopy. The results
provide a convenient and reliable means for systematically determining the sample
Mo/W composition. The absence of disorder effects in its interlayer motion (unlike
for the intralayer motion) and the lack of Mo/W composition dependence of the shear
mode force constants enable the facile employment of a reduced monoatomic linear chain
model by treating the bulk alloy as a series of ‘single balls’ of mass (xmMo + (1 − x)mW + 2mS) attached by interlayer springs with a composition‐independent interlayer force constant

Shear mode Raman scattering analysis may consequently be complementary to the electronic
spectroscopy tools (X‐ray photoelectron spectroscopy (XPS) and energy‐dispersive X‐ray
spectroscopy (EDS)), commonly used for mixed alloy bulk composition characterization.

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