TY - JOUR
T1 - Effect of the particle size of micro-scale and nano-scale additions on the formation of compositional fluctuations in Sm-Ba-Cu-O material
AU - Chen, Shih Yun
AU - Wang, Chun Chih
AU - Chen, In Gann
AU - Wu, Maw Kuen
N1 - Funding Information:
Manuscript received October 9, 2004. This work was supported by the National Science Council, Taiwan, China, under Contact NSC-92-2112-M-006-022. S.-Y. Chen and M.-K. Wu are with the Institute of Physics, Academia Sinica, Taipei, Taiwan, China (e-mail: [email protected]). C.-C. Wang and I.-G. Chen are with the Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan, China. Digital Object Identifier 10.1109/TASC.2005.849419
PY - 2005/6
Y1 - 2005/6
N2 - Recently, many studies imply that the existence of field induced pinning centers, which include RE-rich clusters and compositional fluctuations, contribute to the flux pinning in high field regions. The mechanisms to introduce field induced pinning centers have been proposed for different single grained high Tc superconductor systems. Our previous studies indicated that the addition 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 centers. It has been noted that samples with the addition of nano-Nd4Ba2Cu 2O10 (Nd422) particles exhibit a higher Jc - H performance than those with nano-Sm211 precursors, which were supposed to be the result of the different solubility, peritectic temperature, and atomic size of Nd compared to Sm. It is therefore believed that the optimum size of compositional fluctuations will be related to the diffusivities of RE elements, solubility, and the precursor particle size. In this study, Nd 4Ba2Cu2O10 (Nd422) particles of two different sizes: micro scale and nano scale, were used to reveal the size effect. Different microstructures and Jc - H performance were observed which are related to different reactions between the Nd422 additions and the 123 matrix during the melt-textured growth process.
AB - Recently, many studies imply that the existence of field induced pinning centers, which include RE-rich clusters and compositional fluctuations, contribute to the flux pinning in high field regions. The mechanisms to introduce field induced pinning centers have been proposed for different single grained high Tc superconductor systems. Our previous studies indicated that the addition 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 centers. It has been noted that samples with the addition of nano-Nd4Ba2Cu 2O10 (Nd422) particles exhibit a higher Jc - H performance than those with nano-Sm211 precursors, which were supposed to be the result of the different solubility, peritectic temperature, and atomic size of Nd compared to Sm. It is therefore believed that the optimum size of compositional fluctuations will be related to the diffusivities of RE elements, solubility, and the precursor particle size. In this study, Nd 4Ba2Cu2O10 (Nd422) particles of two different sizes: micro scale and nano scale, were used to reveal the size effect. Different microstructures and Jc - H performance were observed which are related to different reactions between the Nd422 additions and the 123 matrix during the melt-textured growth process.
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U2 - 10.1109/TASC.2005.849419
DO - 10.1109/TASC.2005.849419
M3 - Article
AN - SCOPUS:22044455604
SN - 1051-8223
VL - 15
SP - 3742
EP - 3745
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2 PART III
ER -