CAJ | 학술논문

采用低温燃烧合成法(LCS)、共沉淀法和固相法合成了超细Gd_2BaCuO_5 (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GdBa_2Cu_3O_5 (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.
채용저온연소합성법(LCS)、공침정법화고상법합성료초세Gd_2BaCuO_5 (Gd211)분체,병대3충분체적형모、화학순도、비표면적화립도진행료비교.결과표명,LCS공예제비적Gd211분체립도최소,단취최경.장이상3충분체작위참잡제제비GdBa_2Cu_3O_5 (Gd123)초도괴재,괴재적미관형모설명미세Gd211분체적첨가능유효감소Gd123괴체중Gd211과립립도,림계전류밀도적비교표명LCS법소제분체적첨가비령외량충분체경능유효제고림계전류밀도.
Ultra-fine Gd_2BaCuO_5(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 GdBa_2Cu_3O_5(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 (J_c) value compared with those from other two powders.