Peculiarities of Raman scattering in nanometric superionic conductors Cu6PS5Br

Abstract

Superionic conductors Cu 6 PS 5 Br are obtained in nanocrystalline state with ballmilling. Phonon spectra of micro-and nano-powders are studied using Raman spectroscopy. Due to reduction of crystallite size, we have observed essential low-frequency shifts of the Raman scattering bands, broadening of the latter and the corresponding intensity decrease. Specific features of the Raman spectra of nanometric superionic conductors are explained predominantly by their surface phonon modes.

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

“…It is shown in [13,14] that for Cu 6 PS 5 X (X = I, Br) nanocrystalline powders a considerable increase of Rayleigh scattering, masking the low-frequency Raman bands, is observed. Hence, only the Raman bands above 100 cm -1 could be detected.…”

“…In both cases, the halfwidths were estimated after Rayleigh wing constituent having been subtracted. Finally, evolution of the Raman spectra of Cu 6 PS 5 X (X = I, Br) nanocrystalline powders occurring as a result of decreasing the nanocrystal size is explained predominantly by surface phonon modes, which contribution to the Raman spectrum increases due to the higher surface-to-volume ratio [13,14].…”

Pure phase synthesis of Cu3PS4 and Cu6PS5Cl for semiconductor applications

“…Argyrodites, while they may not be useful as solar absorbers, have been explored for use as solid electrolytes. [33][34][35] Cu 6 PS 5 Cl has been of particular interest due to its high performance and copper mobility. 36,37 This material has shown better conductivities than other materials in the same family.…”

“…In a similar case to the enargite materials, synthesis of the argyrodites is done in sealed ampule or vacuum based methods. [34][35][36][37] Experimental Co-addition of CuCl 2 and P 2 S 5 powders at room temperature for solvothermal nanoparticle synthesis…”