摘要
采用粉末熔化工艺(PMP)制备了高Jc的(YHo)Ba_2Cu_3O_(r-y)差热分析结果表明,添加Ho可以改变Y系超导体的熔化温度。在YBa_2Cu_3O_(r-y)中加部分Ho替代Y可以提高体系的Jc,减小样品中211相的平均直径,并且微结构得到改善,在211粒子周围存在大量的晶体缺陷,这些晶体缺陷可能是有效的钉扎中心。
We have prepared (YHo) Ba2Cu3O7-y superconductors with hige Jc value by powder melting process (PMP) method. The DTA result shows that the melting temperature of Y-system superconductor can be reduced by Ho addition. The Jc value can be improved and the size of 211 phase can be reduced by Ho substitution. Microstructures and X-ray diffraction pattern indicate that the 123 grains are preferentaially aligned with mutually parallel a-b conductive planes. There are a number of twins and fine 211 particles in the sample. It is also found that many crystal defects exist around the 211 phase. These defects may act as pinning centers.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第11期1880-1883,T001,T002,共6页
Acta Physica Sinica
基金
国家超导技术联合研究开发中心资助的课题
中国科学院超导办公室资助的课题
