Abstract
We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of Jc. However, the increase of Jc was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in Tc. and Jc is attributed to a suppression of Nd substitution on the Ba site.
| Original language | English |
|---|---|
| Pages (from-to) | 79-84 |
| Number of pages | 6 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 291 |
| Issue number | 1-2 |
| Publication status | Published - 1997 Nov 15 |
| Externally published | Yes |
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Keywords
- Critical current density
- Critical temperature
- Heat-treatment
- Melt process
- Nd-Ba-Cu-O
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Improved superconducting properties of melt-textured Nd123 by additional heat treatment. / Chikumoto, N.; Yoshioka, J.; Murakami, Masato.
In: Physica C: Superconductivity and its Applications, Vol. 291, No. 1-2, 15.11.1997, p. 79-84.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Improved superconducting properties of melt-textured Nd123 by additional heat treatment
AU - Chikumoto, N.
AU - Yoshioka, J.
AU - Murakami, Masato
PY - 1997/11/15
Y1 - 1997/11/15
N2 - We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of Jc. However, the increase of Jc was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in Tc. and Jc is attributed to a suppression of Nd substitution on the Ba site.
AB - We have investigated the effect of additional heat-treatment on the superconducting transition and the flux pinning properties of Nd-Ba-Cu-O melt-textured in air. After the heat-treatment at high temperatures, > 900°C, under low oxygen partial pressure, P(O2) = 0.001 atm, the superconducting transition became sharper accompanied by an increase of Jc. However, the increase of Jc was very small and the secondary peak effect commonly observed in Nd-Ba-Cu-O melt textured in low P(O2) could not be observed. Transmission electron microscopic observations and energy dispersive X-ray analyses show that the spatial variation of the Nd/Ba ratio is reduced after high-temperature heat-treatment, which indicates that an improvement in Tc. and Jc is attributed to a suppression of Nd substitution on the Ba site.
KW - Critical current density
KW - Critical temperature
KW - Heat-treatment
KW - Melt process
KW - Nd-Ba-Cu-O
UR - http://www.scopus.com/inward/record.url?scp=0038911659&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0038911659&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0038911659
VL - 291
SP - 79
EP - 84
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-2
ER -