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Sr_(0.5)Ca_(0.5)CuO_2 has been synthesized by the solid state reaction.Thecompound crystallizes in an orthorhombic unit cell,space group D_(2h)~(17)-Cmcmwith a=3.444 ,b=16.11 ,c=3.868 .It decomposes shove 1038℃.Sr_(0.5)Ca_(0.5)CuO_2 is s black p-type semiconductor with resistivity 53Ω.cmat room tempersture.