【摘要】 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。更多还原

【Abstract】 Ultra-fine Gd2BaCuO5(Gd211) powders were prepared by three different routes including low temperature combustion synthesis(LCS),coprecipitation and solid state reaction.The powders were characterized in terms of morphology,chemical purity,specific surface area and particle size.The results show that LCS process yields the most weakly agglomerated powder with smallest average particle size.The microstructure and superconductor property of GdBa2Cu3O5(Gd123) bulk material fabricated from the precursor of Gd211 powders were also studied.It is found that the employment of fine Gd211 starting powder is effective for the size reduction of Gd211 particles in the bulk samples.Gd123 bulk produced from LCS powder achieved the largest critical current density(Jc) value compared with those from other two powders.更多还原