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Electrical transport properties of bulk MgB2 materials synthesized by electrolysis on fused mixtures of MgCl2, NaCl, KCl and MgB2O4

Bulk MgB2 materials have been synthesized electrochemically from fused mixtures of MgCl2, NaCl, KCl and MgB2O4 under an Ar flow at 600 °C. Electrical resistivity measurements for the samples show an onset of superconducting transition at ∼37 K in the absence of an applied magnetic field. This temperature is quite close to that observed from magnetic measurements. The resistivity decreases to zero below ∼32 K. From the applied-field dependence of resistivity, the upper critical field and the coherence length were calculated to be 9.7 T and 5.9 nm at 0 K, respectively.