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采用低温燃烧合成法(LCS)、共沉淀法和固相法合成了超细Gd2BaCuO5(Gd211)粉体,并对3种粉体的形貌、化学纯度、比表面积和粒度进行了比较。结果表明,LCS工艺制备的Gd211粉体粒度最小,团聚最轻。将以上3种粉体作为掺杂剂制备GdBa2Cu3O5(Gd123)超导块材,块材的微观形貌说明微细Gd211粉体的添加能有效减小Gd123块体中Gd211颗粒粒度,临界电流密度的比较表明LCS法所制粉体的添加比另外两种粉体更能有效提高临界电流密度。
The ultrafine Gd2BaCuO5 (Gd211) powders were synthesized by low temperature combustion synthesis (LCS), coprecipitation and solid phase methods. The morphology, chemical purity, specific surface area and particle size of the powders were compared. The results show that the Gd211 powder prepared by LCS process has the smallest particle size and the lightest agglomeration. The above three kinds of powders as dopants prepared GdBa2Cu3O5 (Gd123) superconducting block, the microstructure of the block shows that the addition of fine Gd211 powder Gd123 block can effectively reduce the particle size of Gd211, the critical current density It shows that the LCS method powder addition more effective than the other two kinds of powder to increase the critical current density.