Abstract: The compounds with the compositions of Sr₃Cu₅O_8+x and CaSrCu₃O_5+x have been syn-thesized by solid phase reaction method. The crystal structures of both compounds are or-thorhombic with a = 3.950Å, b = 11.479Å and c = 13.420Å for Sr₃Cu₅O_8+x and a = 6.489Å,b = 11.280 Å and c = 12.240Å for CaSrCu₃O_5+x, respectively. The oxygen content and oxida-ation state of copper ion were analysized by the iodometric titration. The electric propertymeasurement indicates that both compounds are p-type semiconductor and have lower resistivity. They decomposes at around 936℃.

Key words: Sr₃Cu₅O_8+x, CaSrCu₅O_5+x, structure, electric property