Effect of composition on critical current density of Bi2212/Ag round wires

S. C. Kim; D. W. Ha; S. S. Oh; H. S. Sohn

doi:10.1016/j.cryogenics.2008.10.009

Effect of composition on critical current density of Bi2212/Ag round wires

S. C. Kim
, D. W. Ha
, S. S. Oh
, H. S. Sohn

Nexans Korea Ltd.
Kyungpook National University
Korea Electrotechnology Research Institute

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

We have fabricated Bi2212/Ag round wires using three kinds of precursor to study the effect of a narrow variation of composition. Slightly different compositions - Bi_2.17Sr_1.94Ca_0.89Cu_2.0O_x(N13), Bi_2.15Sr_1.94Ca_0.89Cu_2.0O_x(N14), and Bi_2.17Sr_1.98Ca_0.89Cu_2.0O_x(N15) - were used and Sr/Ca ratio of them were 2.18, 2.18, and 2.22, respectively. The Ag ratios of the wires were 2.7-2.8 and average filament diameter was 19-21 μm. DTA analysis of the wire showed the peritectic temperature of three wires was very similar value of the range of 880-881 °C. The best engineering critical current density (J_e) of three wires at 4.2 K and 0 T was 414-448 A/mm² at the maximum process temperature range of 884-892 °C. The n-value of N14 showed 13.6, whereas other two wires showed lower n-value, estimating the existence of micro-cracks. Although Bi2212/Ag round wires fabricated by three kinds of composition showed similar J_e value, n-value was quite different. It is likely that the fabrication process such as the drawing as well as the composition of precursor will affect on J_e of Bi2212/Ag round wire.

Original language	English
Pages (from-to)	277-279
Number of pages	3
Journal	Cryogenics
Volume	49
Issue number	6
DOIs	https://doi.org/10.1016/j.cryogenics.2008.10.009
State	Published - Jun 2009

Keywords

Bi2212 wire
Composition
Critical current density
High temperature superconductors

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10.1016/j.cryogenics.2008.10.009

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title = "Effect of composition on critical current density of Bi2212/Ag round wires",

abstract = "We have fabricated Bi2212/Ag round wires using three kinds of precursor to study the effect of a narrow variation of composition. Slightly different compositions - Bi2.17Sr1.94Ca0.89Cu2.0Ox(N13), Bi2.15Sr1.94Ca0.89Cu2.0Ox(N14), and Bi2.17Sr1.98Ca0.89Cu2.0Ox(N15) - were used and Sr/Ca ratio of them were 2.18, 2.18, and 2.22, respectively. The Ag ratios of the wires were 2.7-2.8 and average filament diameter was 19-21 μm. DTA analysis of the wire showed the peritectic temperature of three wires was very similar value of the range of 880-881 °C. The best engineering critical current density (Je) of three wires at 4.2 K and 0 T was 414-448 A/mm2 at the maximum process temperature range of 884-892 °C. The n-value of N14 showed 13.6, whereas other two wires showed lower n-value, estimating the existence of micro-cracks. Although Bi2212/Ag round wires fabricated by three kinds of composition showed similar Je value, n-value was quite different. It is likely that the fabrication process such as the drawing as well as the composition of precursor will affect on Je of Bi2212/Ag round wire.",

keywords = "Bi2212 wire, Composition, Critical current density, High temperature superconductors",

author = "Kim, \{S. C.\} and Ha, \{D. W.\} and Oh, \{S. S.\} and Sohn, \{H. S.\}",

year = "2009",

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doi = "10.1016/j.cryogenics.2008.10.009",

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T1 - Effect of composition on critical current density of Bi2212/Ag round wires

AU - Kim, S. C.

AU - Ha, D. W.

AU - Oh, S. S.

AU - Sohn, H. S.

PY - 2009/6

Y1 - 2009/6

N2 - We have fabricated Bi2212/Ag round wires using three kinds of precursor to study the effect of a narrow variation of composition. Slightly different compositions - Bi2.17Sr1.94Ca0.89Cu2.0Ox(N13), Bi2.15Sr1.94Ca0.89Cu2.0Ox(N14), and Bi2.17Sr1.98Ca0.89Cu2.0Ox(N15) - were used and Sr/Ca ratio of them were 2.18, 2.18, and 2.22, respectively. The Ag ratios of the wires were 2.7-2.8 and average filament diameter was 19-21 μm. DTA analysis of the wire showed the peritectic temperature of three wires was very similar value of the range of 880-881 °C. The best engineering critical current density (Je) of three wires at 4.2 K and 0 T was 414-448 A/mm2 at the maximum process temperature range of 884-892 °C. The n-value of N14 showed 13.6, whereas other two wires showed lower n-value, estimating the existence of micro-cracks. Although Bi2212/Ag round wires fabricated by three kinds of composition showed similar Je value, n-value was quite different. It is likely that the fabrication process such as the drawing as well as the composition of precursor will affect on Je of Bi2212/Ag round wire.

AB - We have fabricated Bi2212/Ag round wires using three kinds of precursor to study the effect of a narrow variation of composition. Slightly different compositions - Bi2.17Sr1.94Ca0.89Cu2.0Ox(N13), Bi2.15Sr1.94Ca0.89Cu2.0Ox(N14), and Bi2.17Sr1.98Ca0.89Cu2.0Ox(N15) - were used and Sr/Ca ratio of them were 2.18, 2.18, and 2.22, respectively. The Ag ratios of the wires were 2.7-2.8 and average filament diameter was 19-21 μm. DTA analysis of the wire showed the peritectic temperature of three wires was very similar value of the range of 880-881 °C. The best engineering critical current density (Je) of three wires at 4.2 K and 0 T was 414-448 A/mm2 at the maximum process temperature range of 884-892 °C. The n-value of N14 showed 13.6, whereas other two wires showed lower n-value, estimating the existence of micro-cracks. Although Bi2212/Ag round wires fabricated by three kinds of composition showed similar Je value, n-value was quite different. It is likely that the fabrication process such as the drawing as well as the composition of precursor will affect on Je of Bi2212/Ag round wire.

KW - Bi2212 wire

KW - Composition

KW - Critical current density

KW - High temperature superconductors

UR - https://www.scopus.com/pages/publications/67349269928

U2 - 10.1016/j.cryogenics.2008.10.009

DO - 10.1016/j.cryogenics.2008.10.009

M3 - Article

AN - SCOPUS:67349269928

SN - 0011-2275

VL - 49

SP - 277

EP - 279

JO - Cryogenics

JF - Cryogenics

IS - 6

ER -

Effect of composition on critical current density of Bi2212/Ag round wires

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Keywords

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