The effect of temperature and pressure on the optical absorption edge in Cu6PS5X crystals

Phonon spectra of Cu_{6}PS_{5}Br superionic ferroelastic: experimental and theoretical studies

“…Below the ferroelastic PT temperature Cu 6 PS 5 Br crystals belong to monoclinic syngony (space group Cc), and the superionic PT reveals the features of an isostructural transformation [5]. The ferroelastic PT is a second order transition, as indicated by a typical temperature behavior of specific heat, dielectric constant and elastic properties [3][4][5][6][7][8][9][10]. At T = T c domains appear in the crystal structure.…”

“…At T = T c domains appear in the crystal structure. The results of electrical, dielectric, calorimetric, acoustic and optical properties of Cu 6 PS 5 Br crystals were presented in references [3][4][5][6][7][8][9][10]. The present paper is aimed at the experimental and theoretiacal studies of phonon spectra in Cu 6 PS 5 Br superionic ferroelastics.…”

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

“…Cu 6 PS 5 X (X = I, Br) single crystals were grown using chemical vapour transport [9]. High-purity Cu, P, S and copper monohalide obtained by precipitation from aqueous solutions and distilled in vacuum were used as initial components for the synthesis.…”

“…At room temperature, they belong to the cubic crystal system ( m F 3 4 space group), while below the room temperature they undergo two phase transitions [4,5]. The phase transitions in Cu 6 PS 5 X (X = I, Br) crystals are accompanied by anomalous behaviour of dielectric, acoustic, calorimetric, and optical properties [3][4][5][6][7][8][9]. In few recent years, much attention was devoted to studies of composites and nanocrystalline powders based on Cu 6 PS 5 X (X = I, Br) superionic conductors [10 -14].…”

Influence of cation substitution on electrical conductivity and optical absorption edge in Cu7(Ge1–xSix)S5I mixed crystals

“…Spectrometric studies of the optical absorption edge were carried out within the temperature range 77-300 K by using the LOMO KSVU-23 grating monochromator [10]. For these measurements, the samples were oriented at room temperature while being in the cubic phase.…”