Sulphur conductive solid electrolytes in MeS–Ln2S3 systems

Sulfide ceramic materials based on CaYb2S4 with functional electrolytic properties

“…The electron transport numbers were measured by the Hebb-Wagner method in electrochemical cell (2) with one blocking electrode and one electrode reversible with respect to sulfide ions at temperatures of 603, 643, and 673 K. We investigated the samples with the stoichiometric content of the calcium sulfide and the samples doped with the ytterbium sulfide. The currentvoltage characteristics for the solid solutions of the CaS sulfide in the CaYb 2 S 4 compound do not involve plateaus corresponding to the saturation current.…”

“…The electron transport numbers t e were determined using the polarization method [5] in the electrochemical cell (2) in the voltage range 0.1-2.0 V. The electronic conductivity σ el was calculated from the formula (3) where I is the electronic saturation current, z is the ion charge, F is the Faraday number, R is the universal gas constant, and l and s are the geometric parameters of the solid electrolyte.…”

“…Calcium thioytterbiate and related phases belong to the class of alkaline-earth thiolanthanates [1,2], which are ceramic materials of functional purpose, i.e., solid electrolytes with sulfur conductivity. Defect phases based on calcium thioytterbiate crystallize in an orthorhombic lattice of the Yb 3 S 4 type in which Yb 2+ ions are replaced by Ca 2+ ions.…”

Electrolytic properties of the MeLn2S4-Ln′2 S3 phases synthesized using the sol-gel and cryochemical technologies

“…The homogeneous doping of ternary sulfides with the corresponding binary sulfides leads to the forma tion of bipolar vacancies; however, the specific fea tures of the structure of the basic compounds provide a means for freely moving only the sulfide anion in the bulk of the crystal [4]. The extension of the class of sul fide conducting solid electrolytes for the purpose of changing and controlling their electrolytic properties and field of application can proceed in the direction of increase in the number of components in the already known anion deficient phases due to not only the homogeneous doping but also the heterogeneous dop ing [5].…”

Transport properties of solid electrolytes based on MeSm2S4

“…A detailed electrochemical investigation of the nonstoichiometric phases based on the ternary compounds Me ZrS 2 and MeLn 2 S 4 (where Me is an alkaline-earth metal and Ln is a rare-earth metal) revealed that sulfide-ion conduction can occur in compounds in a number of Me S-Ln 2 S 3 systems [2][3][4][5].…”