K2(Rb2,Cs2,Tl2)TeBr6(I6) and Rb3(Cs3)Sb2(Bi2)Br9(I9) perovskite compounds

Abstract
We systematize available experimental data on the crystal structure of the ternary halides K2(Rb2,Cs2,Tl2)TeBr6(I6) and Rb3(Cs3)Sb2(Bi2)Br9(I9), analyze the general trends in the properties of their single crystals, and examine the key features of the physicochemical interaction in related systems.