Packing on the tetrahedra of sulphur atoms about p-ingredient atoms within the buildings with the AgGaS2, AgGaGeS4 and KGaGeS4 compounds.AgGaGeS4 compound (AGGS) can be a promising nonlinear content for mid-IR apps. The various measures of this elements processing are presented. The chemical synthesis of polycrystals and The only crystal advancemen