Single-grain bulks of GdBaCuO were successfully prepared under the ambient atmosphere via cold seeds of Nd-Ba-Cu-Mg-O crystal and MTG. The superconducting samples were obtained at about 400 ℃ by flowing oxgyen atmosphere. The influence of BaCuO2-δ addtion on the melting temperature of GdBaCuO precursor powders, the growth of samples and the supercongducting levitation force properties were investigated. Results show that BaCu-O2-δ powder doped in GdBaCuO can significantly decrease the melting temperature of GdBaCuO precursor powder. From' 0 to 0. 5mol of BaCuO2 content in substrate, the single domain bulks with no macrocracks on the surface are prepared. The appropriate amount of BaCuO2-δ addtion(χ=0. 2) can effectively improve the superconducting properties,the maximum levitation force density is about 12N/cm2(77K).%采用Nd-Ba-Cu-Mg-O冷籽晶和熔融织构生长工艺,在空气气氛下制备出GdBaCuO单畴块材,并通过流通氧气气氛退火处理获得超导样品.研究了前驱粉末中不同BaCuO2-δ含量对GdBaCuO前驱粉末熔化温度、块材生长及超导磁浮力性能的影响.结果表明,GdBaCuO前驱粉末的熔点随着BaCuO2-δ添加量的增加而降低.前驱粉末中BaCuO2- δ的添加量为0～0.5mol时,GdBaCuO块材均能生长成表面没有宏观裂纹、尺寸为φ17mm的单畴,而BaCuO2-δ添加量为0.2mol时,样品的磁浮力性能最高,最大磁浮力密度达到12N/cm2 (77K).
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