The structure,magnetic,and superconducting properties of the (Tl_(1-x)Al_(x))2Ba_(2)Ca_(2)Cu_(3)O_(y) with x=0.05,0.1,0.15,0.2 were studied.The T_(c)^(R=0) depends on whether the sample has a 222S phase structure or has a 2212 phase structure.The magnetic properties in low field were measured and discussed.
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