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Ag₈SnSe₆ argyrodite synthesis and optical properties

100%

Semkiv I. , Ilchuk H. , Pawlowski B. , Kusnezh V.

Opto-Electronics Review

2017

tom Vol. 25, No. 1

37--40

The Ag₈SnSe₆ argyrodite compound was synthesized by the direct melting of the elementary Ag, Sn and Se high purity grade stoichiometric mixture in a sealed silica ampoule. The prepared polycrystalline material was characterized by the X-ray diffraction (XRD), visible (VIS) and near-infrared (NIR) reflection and photoluminescence (PL) spectroscopy. XRD showed that the Ag₈SnSe₆ crystallizes in orthorhombic structure, Pmn2₁ space group with lattice parameters: ɑ = 7.89052(6) Ǻ, b = 7.78976(6) Ǻ, c = 11.02717(8) Ǻ. Photo-luminescence spectra of the Ag₈SnSe₆ polycrystalline wafer show two bands at 1675 nm and 1460 nm. Absorption edge position estimated from optical reflectance spectra is located in the 14131540 nm wavelength range.

Structural phase transitions and their influence on Cu+ mobility in superionic ferroelastic Cu6PS5I single crystals

72%

Gągor A. , Pietraszko A. , Drozd M. , Połomska M. , Kaynts D.

Materials Science Poland

2006

tom Vol. 24, No. 1

237--243

The structural origin of Cu+ ion conductivity in Cu6PS5I single crystals is described in terms of structural phase transitions studied by X-ray diffraction, polarized light microscopy and calorimetric measurements. Below the phase transition temperature at Tc = (144-169) K, Cu6PS5I belongs to the monoclinic, ferroelastic phase, with the space group Cc. Above Tc, the crystal changes its symmetry to a cubic superstructure, with the space group F43c (a' = 19.528); finally, at 274 K, the disordering of Cu+ ions increases to the symmetry F43m (a = 9.794). The phase transition at 274 K coincides well with a strong anomaly in electrical conductivity observed on the Arrhenius plot. Diffusion paths for Cu+ ions are evidenced by means of atomic displacement factors and a split model. The influence of copper stoichiometry on Tc is also discu