The effect of isovalent cation substitution on mechanical properties of (Cu𝑥Ag1−𝑥)7SiS5I superionic mixed single crystals

Abstract

(Cu𝑥Ag1−𝑥)7SiS5I mixed crystals were grown by the Bridgman–Stockbarger method. The microhardness measurements are carried out at room temperature using a Vickers indenter. The compositional dependence of the microhardness is studied. The dependence of the microhardness on the depth of imprint is analyzed in the model of geometrically necessary dislocations. The indentation size effect is observed. It is established that the microhardness of (Cu𝑥Ag1−𝑥)7SiS5I mixed crystals decreases at the substitution of Cu atoms by Ag atoms.