“…Still, quasiternary systems with Cd or Zn are of interest in the same respect because the sections between argyrodites Ag 8 B IV X 6 and A II X components are quasi-binary. Four of the herediscussed phase diagrams are of the eutectic type (Ag 8 SnS 6 -ZnS [31], Ag 8 SnS 6 -CdS [29], Ag 8 SnSe 6 -CdSe [21], Ag 8 SnS 6 -HgS [28]), and only one is peritectic (Ag 8 GeS 6 -CdS [27]). In corresponding copper-containing systems, at least those that have already been investigated, even if a compound of the argyrodite family Cu 8 B IV X 6 forms, the Cu 8 B IV X 6 -A II X sections are not quasi-binary [32].…”