Diffusion paths formation for Cu+ ions in superionic Cu6PS5I single crystals studied in terms of structural phase transition

Influence of cation substitution on phase transition and optical absorption edge in Cu6(P1-xAsx)S5I mixed crystals

“…According to [16], the influence of different types of disordering on the Urbach energy in mixed crystals is described by the relation (5) and (6) evidences that (E U ) X, C  (E U ) 0 and…”

“…The Cu 6 PS 5 I crystal is the most intensely studied one among argyrodite-type superionic conductors. At low temperatures, in the Cu 6 PS 5 I crystal two phase transitions (PTs) occur: (i) a structural secondorder PT at T II = (269±2) K which is accompanied by the symmetry change m F 3 4  c F 3 4 and (ii) a superionic and ferroelastic first-order PT at T I = (144±1) K accompanied by the symmetry change c F 3 4  Сс [5,6]. Studies of the optical absorption edge in Cu 6 PS 5 I crystal have shown the existence of bound and free excitons at high absorption levels at temperatures below the first-order PT, which undergo the significant changes with the temperature increase [7,8].…”

Electrical and optical parameters of Cu6PS5I-based thin films deposited using magnetron sputtering

“…A typical Urbach bundle is observed, the temperature behaviour of the Urbach absorption edge in Cu 5.46 P 1.68 S 5.06 I 0.80 thin film is explained by strong electron-phonon interaction. Temperature dependences of the absorption edge energy position and the Urbach energy for Cu 5 …”

“…At room temperature, they belong to the cubic syngony m F 3 4 . With temperature decrease, two phase transitions occur, first of them at T II = (269±2) K is the structural secondorder phase transition (accompanied by the change of symmetry m F 3 4 → c F 3 4 ), and the second -at T I = (144±1) K is at the same time superionic and ferroelastic first-order phase transition (accompanied by the change of symmetry c F 3 4 →Сс) [5]. Optical absorption, luminescence, Raman scattering, refractive index dispersion for Cu 6 PS 5 I crystals were extensively studied in the works [6][7][8].…”

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

“…The latter defines the possibilities of their practical application as solid electrolyte sources of energy, sensors and highly efficient capacitors. 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].…”