The Influence of Structural Defects on Intra-Granular
Critical Currents of Bulk MgB2

A. Serquis; X. Z. Liao; L. Civale; Y. T. Zhu; J. Y. Coulter; D. E. Peterson; F. M. Mueller

doi:10.1109/TASC.2003.812093

The Influence of Structural Defects on Intra-Granular Critical Currents of Bulk MgB₂

A. Serquis
, X. Z. Liao
, L. Civale
, Y. T. Zhu
, J. Y. Coulter
, D. E. Peterson
, F. M. Mueller

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

6 Citations (Scopus)

Abstract

Bulk MgB₂ samples were prepared under different synthesis conditions and analyzed by scanning and transmission electron microscopy. The critical current densities were determined from the magnetization versus magnetic field curves of bulk and powder-dispersed-in-epoxy samples. Results show that through a slow cooling process, the oxygen dissolved in bulk MgB₂ at high synthesis temperatures can segregate and form nanometer-sized coherent precipitates of Mg(B, O)₂ in the MgB₂ matrix. Magnetization measurements indicate that these precipitates act as effective flux pinning centers and therefore significantly improve the intra-grain critical current density and its field dependence.

Original language	English
Pages (from-to)	3068-3071
Journal	IEEE Transactions on Applied Superconductivity
Volume	13
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2003.812093
Publication status	Published - Jun 2003
Externally published	Yes
Event	2002 Applied Superconductivity Conference - Houston, TX, United States Duration: 4 Aug 2002 → 9 Aug 2002

Research Keywords

Critical current
Magnetic analysis
Materials processing
Superconducting materials

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10.1109/TASC.2003.812093

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title = "The Influence of Structural Defects on Intra-Granular Critical Currents of Bulk MgB2",

abstract = "Bulk MgB2 samples were prepared under different synthesis conditions and analyzed by scanning and transmission electron microscopy. The critical current densities were determined from the magnetization versus magnetic field curves of bulk and powder-dispersed-in-epoxy samples. Results show that through a slow cooling process, the oxygen dissolved in bulk MgB2 at high synthesis temperatures can segregate and form nanometer-sized coherent precipitates of Mg(B, O)2 in the MgB2 matrix. Magnetization measurements indicate that these precipitates act as effective flux pinning centers and therefore significantly improve the intra-grain critical current density and its field dependence.",

keywords = "Critical current, Magnetic analysis, Materials processing, Superconducting materials, Critical current, Magnetic analysis, Materials processing, Superconducting materials, Critical current, Magnetic analysis, Materials processing, Superconducting materials",

author = "A. Serquis and Liao, \{X. Z.\} and L. Civale and Zhu, \{Y. T.\} and Coulter, \{J. Y.\} and Peterson, \{D. E.\} and Mueller, \{F. M.\}",

year = "2003",

month = jun,

doi = "10.1109/TASC.2003.812093",

language = "English",

volume = "13",

pages = "3068--3071",

journal = "IEEE Transactions on Applied Superconductivity",

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note = "2002 Applied Superconductivity Conference ; Conference date: 04-08-2002 Through 09-08-2002",

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TY - JOUR

T1 - The Influence of Structural Defects on Intra-Granular Critical Currents of Bulk MgB2

AU - Serquis, A.

AU - Liao, X. Z.

AU - Civale, L.

AU - Zhu, Y. T.

AU - Coulter, J. Y.

AU - Peterson, D. E.

AU - Mueller, F. M.

PY - 2003/6

Y1 - 2003/6

N2 - Bulk MgB2 samples were prepared under different synthesis conditions and analyzed by scanning and transmission electron microscopy. The critical current densities were determined from the magnetization versus magnetic field curves of bulk and powder-dispersed-in-epoxy samples. Results show that through a slow cooling process, the oxygen dissolved in bulk MgB2 at high synthesis temperatures can segregate and form nanometer-sized coherent precipitates of Mg(B, O)2 in the MgB2 matrix. Magnetization measurements indicate that these precipitates act as effective flux pinning centers and therefore significantly improve the intra-grain critical current density and its field dependence.

AB - Bulk MgB2 samples were prepared under different synthesis conditions and analyzed by scanning and transmission electron microscopy. The critical current densities were determined from the magnetization versus magnetic field curves of bulk and powder-dispersed-in-epoxy samples. Results show that through a slow cooling process, the oxygen dissolved in bulk MgB2 at high synthesis temperatures can segregate and form nanometer-sized coherent precipitates of Mg(B, O)2 in the MgB2 matrix. Magnetization measurements indicate that these precipitates act as effective flux pinning centers and therefore significantly improve the intra-grain critical current density and its field dependence.

KW - Critical current

KW - Magnetic analysis

KW - Materials processing

KW - Superconducting materials

KW - Critical current

KW - Magnetic analysis

KW - Materials processing

KW - Superconducting materials

KW - Critical current

KW - Magnetic analysis

KW - Materials processing

KW - Superconducting materials

UR - https://www.scopus.com/pages/publications/0042475645

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0042475645&origin=recordpage

U2 - 10.1109/TASC.2003.812093

DO - 10.1109/TASC.2003.812093

M3 - RGC 21 - Publication in refereed journal

SN - 1051-8223

VL - 13

SP - 3068

EP - 3071

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2

T2 - 2002 Applied Superconductivity Conference

Y2 - 4 August 2002 through 9 August 2002

ER -

The Influence of Structural Defects on Intra-Granular Critical Currents of Bulk MgB₂

Abstract

Research Keywords

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