Size effect of Y211 additions in Sm–Ba–Cu–O materials

Authors: Chen, Shih-Yun; Chen, In-Gann; Wu, Maw-Kuen

Source: Superconductor Science and Technology, Volume 18, Number 6, June 2005 , pp. 916-920(5)

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Abstract:

Our previous studies indicate that small additions of nano-scale RE₂BaCuO₅ (RE211, RE: rare elements) form nano-sized compositional fluctuations during the melt-growth process and thus act as field induced pinning centres. The solubility, peritectic temperature, and atomic size of these nmRE211 additives alter the J_c–H performance. To further reveal the effect of size and amount of RE211 additives, in this study, Y₂Ba₁Cu₁O₅ (Y211) particles of two different sizes, micro-scale (µm) and nano-scale (nm), were used. The superconducting results indicate that the contribution of J_c in high field regions is larger in nmY211 than µmY 211. The microstructure results imply that µmY 211 particles tend to form Y-rich regions in the core shell, while nmY211 particles tend to produce regions with Y fluctuations and high defect density. These different results are attributed to the reactions between the Y211 additions and the 123 matrix during the melt-textured growth process.

Document Type: Research article

DOI: http://dx.doi.org/10.1088/0953-2048/18/6/021

Publication date: 2005-06-01