TY - JOUR
T1 - Hot-seeding melt growth of large (Sm-Eu) 123 single domains in air with controlled chemical substitutions
AU - Hu, A.
AU - Sakai, N.
AU - Murakami, M.
N1 - Funding Information:
Manuscript received August 5, 2002. This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Supercondcutivity Applications. The authors are with the Superconductivity Research Laboratory, International Superconductivity Technology Center, Tokyo 105-0023, Japan. Digital Object Identifier 10.1109/TASC.2003.812108
Funding Information:
A. Hu thanks the NEDO for providing a research fellowship.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2003/6
Y1 - 2003/6
N2 - Hot-seeding melt growth of large (Sm-Eu)123 single domains has been investigated in air with Nd123 seeds. A homogenization at the partial molten state, which was achieved by annealing at 1100 °C for half an hour and at 1070 °C for 2 to 4 hours before seeding, was the key to the growth of large single domains with a diameter more than 3 cm. After seeding one sample was grown in a slow cooling at 0.3 °C/hour for 120 hours. The other sample was grown with a fast cooling at a rate of 2 °C/hour for 15 hours followed by a 0.3 °C/hour slow cooling for 100 hours. The measurements of local Tc and Jc values over the entire bulks evidenced that a large spatial variation in the superconducting properties was observed in the sample grown with the former thermal schedule, while the latter thermal profile favored the growth of near stoichiometric (SmxEu1-x) Ba2Cu3O7-δ over the whole processing and thereby significantly enhanced the field trapping capacity.
AB - Hot-seeding melt growth of large (Sm-Eu)123 single domains has been investigated in air with Nd123 seeds. A homogenization at the partial molten state, which was achieved by annealing at 1100 °C for half an hour and at 1070 °C for 2 to 4 hours before seeding, was the key to the growth of large single domains with a diameter more than 3 cm. After seeding one sample was grown in a slow cooling at 0.3 °C/hour for 120 hours. The other sample was grown with a fast cooling at a rate of 2 °C/hour for 15 hours followed by a 0.3 °C/hour slow cooling for 100 hours. The measurements of local Tc and Jc values over the entire bulks evidenced that a large spatial variation in the superconducting properties was observed in the sample grown with the former thermal schedule, while the latter thermal profile favored the growth of near stoichiometric (SmxEu1-x) Ba2Cu3O7-δ over the whole processing and thereby significantly enhanced the field trapping capacity.
KW - Chemical substitution
KW - Cooling rate
KW - Hot-seeding
KW - Melt-process
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U2 - 10.1109/TASC.2003.812108
DO - 10.1109/TASC.2003.812108
M3 - Conference article
AN - SCOPUS:0042967683
SN - 1051-8223
VL - 13
SP - 3079
EP - 3082
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2 III
T2 - 2002 Applied Superconductivity Conference
Y2 - 4 August 2002 through 9 August 2002
ER -