中文摘要：

本文介绍了一种新的制备MgB2膜的方法——溶胶凝胶法.以Mg（BH4）2的乙醚溶液（Mg（BH4）2·Et2O）作为前驱体,将其覆涂于Al2O3（001）衬底上,并在Mg气氛保护下高温退火,得到了MgB2的多晶膜.与其它制备MgB2膜的方法相比,这种方法制备的膜具有较高品质,超导转变温度达到37K,临界电流密度Jc（5K,0T）～5×106A/cm2,上临界场Hc2（0）～19T.对于MgB2厚膜及线带材的制备,溶胶凝胶法被证明是一种极具潜力的方法.

英文摘要：

We report a new sol-gel method for fabricating MgB2 films.Polycrystalline MgB2 films were prepared by spin-coating precursor solution of Mg（BH4）2 diethyl ether on （001）Al2O3 substrates followed with annealing in Mg vapor.In comparison with the MgB2 films grown by other techniques,our films show medium qualities including the superconducting transition temperature of TC~37K,critical current density of Jc （5 K,0T）~5×106 A/cm2,and critical field of HC2（0）~19T.This sol-gel technique has demonstrated to be potential in commercial fabrication of practical used MgB2 films as well as MgB2wires and tapes.