X-ray diffraction and Raman scattering in SbSI nanocrystals

Raman spectroscopy and X-ray diffraction studies of (GeS2 )100-x(SbSI)x glasses and composites on their basis

“…The similar bands are observed in the Raman spectra of mono- [33,34], poly- (Fig. 4, curve 1) and nano- [37,38] crystalline SbSI. It was shown above that the glasses of the GeS 2 -SbSI system have the nanoheterogenous structure.…”

Peculiarities of Raman scattering in nanometric superionic conductors Cu6PS5Br

“…The former factor seems to be hardly possible in our case because, according to the calculations [18], the minimal crystallite size under studies (15 nm) is too large to ascribe the observed features of size-related behaviour of the Raman band parameters to phonon confinement. Hence, the changes in the Raman spectra observed with decreasing nanocrystallite size could be assigned to surface phonon modes.…”

“…It should be noted that, contrary to the case of bulk crystals, the contribution of surface phonons to the Raman spectrum of nanocrystalline powders should be taken into account independently of exciting beam probing depth [18]. Therefore, for the spherical microcrystals of diameter d one might expect Raman observation of a series of surface …”

Raman scattering studies of composites based on Cu6PS5X (X = I, Br) superionic nanocrystals

“…It should be noted that in nanometric crystals the low-frequency shift of Raman bands and their broadening are most often explained by confinementrelated selection rules violation due to the small crystal size [15] and surface phonon modes [16]. In our case, the former factor seems to be hardly possible, because the minimal nanocrystal size studied here (15 nm) is, according to the calculations in [17], too big to ascribe the observed features of the size-related behaviour of the Raman band parameters to the phonon confinement. As an alternative, the observed changes in the Raman spectra of nanocomposites can be assigned to Fröhlich surface phonon modes.…”