Abstract
In this paper we report a new sol–gel method for the fabrication ofMgB2 films.Polycrystalline MgB2 films were prepared by spin-coating a precursor solution ofMg(BH4)2 diethylether on (001)Al2O3 substrates followed with annealing in Mg vapor. In comparison with theMgB2 films grownby other techniques, our films show medium qualities including a superconducting transition temperature ofTC ∼ 37 K, a critical currentdensity of JC(5 K, 0 T) ∼ 5 × 106 A cm − 2, anda critical field of HC2(0) ∼ 19 T. Such a sol–gel technique shows potential in the commercial fabrication of practically usedMgB2 films aswell as MgB2 wires and tapes.
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