Abstract
Effects of size and volume fraction of the Nd4Ba2Cu2O10 (Nd422) second phase on the critical current density (Jc) were studied for the Nd-Ba-Cu-O bulk superconductors fabricated by an oxygen-controlled-melt-growth (OCMG) process. The size of the Nd422 second phase trapped in NdBa2Cu3Oy (Nd123) superconducting matrix was controlled using two different precursors of Nd123-Nd422 powders and the melt-quenched powders. Finer Nd422 second phase with an average diameter of 1-2μm was obtained in the sample fabricated from the mixture of Nd123-Nd422 precursors when the initial Nd422 powders of less than 1μm was employed. The Jc was significantly improved especially in low field by refining the Nd422 second phase. While a small amount of Nd422 addition increases the Jc in low field without sacrificing the Jc near the fishtail peak, the peak effect was drastically depressed by increasing the volume fraction.
| Original language | English |
|---|---|
| Pages (from-to) | 83-86 |
| Number of pages | 4 |
| Journal | Superlattices and Microstructures |
| Volume | 21 |
| Issue number | Suppl A |
| Publication status | Published - 1997 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Control of the Nd422 second phase for the improvement of the critical current density in Nd-Ba-Cu-O superconductors. / Kojo, H.; Yoo, S. I.; Sakai, Naomichi; Murakami, Masato.
In: Superlattices and Microstructures, Vol. 21, No. Suppl A, 1997, p. 83-86.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Control of the Nd422 second phase for the improvement of the critical current density in Nd-Ba-Cu-O superconductors
AU - Kojo, H.
AU - Yoo, S. I.
AU - Sakai, Naomichi
AU - Murakami, Masato
PY - 1997
Y1 - 1997
N2 - Effects of size and volume fraction of the Nd4Ba2Cu2O10 (Nd422) second phase on the critical current density (Jc) were studied for the Nd-Ba-Cu-O bulk superconductors fabricated by an oxygen-controlled-melt-growth (OCMG) process. The size of the Nd422 second phase trapped in NdBa2Cu3Oy (Nd123) superconducting matrix was controlled using two different precursors of Nd123-Nd422 powders and the melt-quenched powders. Finer Nd422 second phase with an average diameter of 1-2μm was obtained in the sample fabricated from the mixture of Nd123-Nd422 precursors when the initial Nd422 powders of less than 1μm was employed. The Jc was significantly improved especially in low field by refining the Nd422 second phase. While a small amount of Nd422 addition increases the Jc in low field without sacrificing the Jc near the fishtail peak, the peak effect was drastically depressed by increasing the volume fraction.
AB - Effects of size and volume fraction of the Nd4Ba2Cu2O10 (Nd422) second phase on the critical current density (Jc) were studied for the Nd-Ba-Cu-O bulk superconductors fabricated by an oxygen-controlled-melt-growth (OCMG) process. The size of the Nd422 second phase trapped in NdBa2Cu3Oy (Nd123) superconducting matrix was controlled using two different precursors of Nd123-Nd422 powders and the melt-quenched powders. Finer Nd422 second phase with an average diameter of 1-2μm was obtained in the sample fabricated from the mixture of Nd123-Nd422 precursors when the initial Nd422 powders of less than 1μm was employed. The Jc was significantly improved especially in low field by refining the Nd422 second phase. While a small amount of Nd422 addition increases the Jc in low field without sacrificing the Jc near the fishtail peak, the peak effect was drastically depressed by increasing the volume fraction.
UR - http://www.scopus.com/inward/record.url?scp=0030713640&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030713640&partnerID=8YFLogxK
M3 - Article
VL - 21
SP - 83
EP - 86
JO - Superlattices and Microstructures
JF - Superlattices and Microstructures
SN - 0749-6036
IS - Suppl A
ER -