The Y123,Y358 and Y3-811 bulk superconductors have been synthesized by solid state reaction using fluorine doping. The composite superconductors were characterized by a homemade standard d.c. four-probes method. The crystal structure was investigated by powder X-ray diffraction analysis. The X-ray diffraction spectrum was analyzed using a FULLPROF software program. The results revealed that Tconse, and Tcofiset decrease when the fluorine doping is increased .These materials had closely the same value in a,b direction. The lower superconducting phase, critical temperature, value of c direction and anisotropic were found at fluorine doping.
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