Heterogeneous doping of sulfide-conducting phases based on calcium and barium thiolanthanates

Resumo

The chemical method of preparation of oxide precursors was used to obtain sulfide-conducting ionic salts of CaY₂S₄, BaSm₂S₄ and heterogeneous additives of ZrS₂ and SiS₂, accordingly. The sintering modes for obtaining the heterogeneous systems of CaY₂S₄–ZrS₂ and BaSm2S4–SiS2 were chosen. Samples were characterized using the methods of X-ray phase analysis and microprobe analysis. The methods of thermogravimetric and differential thermal analysis were used to determine thermal stability of samples. The temperature and concentration dependences of conductivity and average ionic transport numbers were studied. The range of compositions of heterogeneous mixtures is determined in which conductivity considerably exceeds conductivity of the basic sulfide-conducting solid electrolytes.