Electrochemical Methods for Studying Transport Properties and the Type of Ionic Conduction in Solid Electrolytes Based on CaPr2S4 and Ca(Ba)Sm2S4

Abstract

The theoretical feasibility of sulfide ion transport in phases based on MeLn 2 S 4 (Me = Ca, Ba; Ln = Sm, Pr) is considered. Regions of solid solutions on the basis of ternary compounds are determined. A systematic investigation of phases is performed with the application of a variety of electrochemical methods, specifically, the conductimetry, emf in chemical concentration cells with and without transport, and Tubandt methods.

Sulfide-conducting solid electrolytes for preparation of nonstoichiometric compounds with controlled composition and properties

“…Alkaline-earth thiolanthanates and related heterovalent solid solutions with an anion-deficient sublattice are known as ionic conductors with a virtually unipolar sulfide-ion conduction and a rather small contribution of the electronic component at temperatures in the range 623-723 K [1][2][3]. The electrolytic properties of a number of MLn 2 S 4 compounds and related phases are presented in Table 1.…”

“…In this work, we investigated the influence of the electrical resistance of solid electrolytes on their possible use in electrochemical cells for coulometric titration. The experiments were performed with the solid electrolytes in the CaY 2 S 4 -Y 2 S 3 [4], CaPr 2 S 4 -Pr 2 S 3 [5], and BaSm 2 S 4 -Sm 2 S 3 systems [3] at different contents of the doping sulfide, which exhibited optimum electrolytic properties.…”

“…Phase diagram of the PbS sulfide in the vicinity of the stoichiometric composition according to the data obtained by the (1) heterogeneous equilibrium method[6,10,13] and (2-4) coulometric titration method (2) with a lead-conducting solid electrolyte[12],(3) in an electrochemical cell with a CaPr 2 S 4 -based solid electrolyte[11], and (4) in an electrochemical cell with a BaSm 2 S 4 -based solid electrolyte.…”