摘要
采用顶部热籽晶技术和"二步冷却"生长工艺,在空气中制备了Gd-Ba-Cu-O、(SmGd)-Ba-Cu-O和(SmEuGd)-Ba-Cu-O三种体系的单畴熔融织构样品,并研究了Ar气氛退火(ArPA)对所制备的单畴样品超导性能的影响.结果表明,三种体系的单畴样品77K下的俘获场分布均呈中心对称的圆锥形,其中SEG样品的冻结场达到0.34T(φ18mm),与OCMG工艺制备的相同尺寸的样品处在同一水平.Ar气氛退火对三种体系单畴样品超导性能的影响不同:对Gd-Ba-Cu-O体系,ArPA不能进一步提高单畴样品的临界电流密度;而对(SmGd)-Ba-Cu-O和(SmEuGd)-Ba-Cu-O体系,合适温度下的ArPA可以大幅度提高样品的超导性能.
Single-grain bulks of Gd-Ba-Cu-O, （SmGd）-Ba-Cu-O and （SmEuGd）-Ba-Cu-O superconductors with high performance were successfully fabricated via two-step cooling method and top-seededmelt-growth in the ambient atmosphere. The trapped field distributions at 77K were perfect symmetric, and the maximum value of trapped field for （SmEuGd）-Ba-Cu-O sample （Ф18mm） reaches 0.34T, which is comparable with that obtained through OCMG method. The effects of post-annealing in Ar （ArPA） are different for the three LRE-Ba-Cu-O systems. For Gd-Ba-Cu-O system, ArPA cannot improve the superconducting properties. For （SmGd）-Ba-Cu-O and （SmEuGd）-Ba-Cu-O systems, however, their superconducting performances can be enhanced by appropriate ArPA treatment.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第2期309-314,共6页
Journal of Inorganic Materials
基金
云南省中青年学术技术带头人后备人才培养项目(2006PY01-09)
作者简介
代建清（1972-），男，博士，教授．E-mail：djq@tsinghua．org．cn
