【摘要】 介绍了一种全新的制备YBCO超导粉末的方法,通过加入右旋糖酐采用生物矿化的方法,可以使制备的YBCO粉末晶粒均呈现出平片状,其典型尺寸为5μm×5μm×1μm,TEM显示这些平片状晶粒本身亦呈现层片状结构。同时在一定的区域内,这些平片状YBCO晶粒会自发聚集形成具有相似生长方向的晶粒簇。在这些晶粒簇内部首次在YBCO内部发现存在有自发超导连接现象。超导连接区域平均包含3~5个平片状晶粒。由于这种YBCO粉末具有特殊的微观结构,所以具有很好的超导性能,其J c值在77 K自场下达到了0.1 MA·cm-2,比同等条件下的商业YBCO粉末高出10倍以上。用这种具有特殊结构的YBCO粉末可以制备出可以实际承载超导传输电流的YBCO导体,结果表明此方法有望成为一条全新且廉价又高效的制备YBCO导体的新路线。更多还原

【Abstract】 a novel technique-biomimeral method to synthesize strong anisotropic platelike crystallites of YBa2Cu3O7-δ( YBCO) superconductor powders is presented. The typical size of obtained YBCO powder is 5 μm × 5 μm × 1 μm. All these grains self assemble to region with local orientation,it allows the intergranular supercurrent pass along average 3 ~ 5grains. TEM shows that every platelike grain expresses hierarchical structure. Due to this particular structure,the intragranular critical current density reaches 0. 1 MA·cm- 2at 77 K and self field,which is 10 times higher than that of the commercial YBCO powder. A YBCO conductor fabricated by platelike YBCO powders can really allow supercurrent flow.The present work provides an important and new route for fabricating YBCO conductors which has the potential applications to solve the limitation existed in that traditional thin film approaches.更多还原