TY - JOUR
T1 - Improved superconducting properties of melt-textured Nd123 by additional heat treatment
AU - Chikumoto, N.
AU - Yoshioka, J.
AU - Murakami, M.
N1 - Funding Information:
The authorsw ould like to acknowledgNei ssan Arc for TEM observationasn d EDX analysis.T his work was partially supportedb y New Energya nd Industrial TechnologyD evelopmenOt rganization (NEDO) for the R&D of IndustrialS ciencea nd TechnologFyr ontierP rogram.
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
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U2 - 10.1016/S0921-4534(97)01705-X
DO - 10.1016/S0921-4534(97)01705-X
M3 - Article
AN - SCOPUS:0038911659
SN - 0921-4534
VL - 291
SP - 79
EP - 84
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -