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介绍了最近发明的一种制备汞系高温超导薄膜的新方法—阳离子置换法．采用Ｔ１ 系外延超导薄膜作为先驱薄膜，将Ｔ１ 系超导薄膜在Ｈｇ 气氛下进行热处理，用Ｈｇ 置换先驱薄膜中的Ｔ１，进而生成Ｈｇ 系外延超导薄膜．用此方法，成功地在ＬａＡｌＯ３ （００１）衬底上制做出了高质量的ＨｇＢａ２ＣａＣｕ２Ｏｘ 超导薄膜．Ｘ－光衍射θ－２θ扫描和极图测试表明，薄膜具有很纯的超导相和很好的外延结构．超导临界温度可达１２２Ｋ．在７７Ｋ温度下，临界电流密度达到３．４×１０６ Ａ／ｃｍ ２，在１１０Ｋ 温度下，临界电流密度仍可保持在０．７×１０６Ａ／ｃｍ ２ ．
A new method for preparing high temperature superconducting mercury films, called cation exchange method, was recently introduced. The T1-based epitaxial superconducting thin film is used as a precursor film, the T1-based superconducting thin film is heat-treated under a Hg atmosphere, and the Hg-based epitaxial superconducting thin film is formed by replacing T1 in the precursor thin film with Hg. With this method, a high quality HgBa2CaCu2Ox superconducting thin film was successfully fabricated on LaAlO3 (001) substrate. X-ray diffraction θ-2θ scan and pole figure test showed that the film has a very pure superconducting phase and very good epitaxial structure. Superconducting critical temperature up to 122K. The critical current density reaches 3.4 × 106 A / cm 2 at 77K, and the critical current density can be maintained at 0.7 × 106A / cm 2 at 110K.