Comparative studies of MgB2/Mg nano-composites and press-sintered MgB2 pellets

Qiang Li; L. Wu; Y. Zhu; A. R. Moodenbaugh; G. D. Gu; M. Suenaga; Z. X. Ye; D. A. Fischer

doi:10.1109/TASC.2003.812070

Comparative studies of MgB₂/Mg nano-composites and press-sintered MgB₂ pellets

Qiang Li
, L. Wu
, Y. Zhu
, A. R. Moodenbaugh
, G. D. Gu
, M. Suenaga
, Z. X. Ye
, D. A. Fischer

Physics and Astronomy

Brookhaven National Laboratory
National Institute of Standards and Technology

Research output: Contribution to journal › Conference article › peer-review

12 Scopus citations

Abstract

We present our studies of superconducting and microstructural properties of bulk MgB₂/Mg nano-composites and press-sintered MgB₂. TEM investigation revealed that the composites are very dense, consisting of nano-sized MgB₂ grains connected by the well-defined clean grain boundaries (GB). Both amorphous and structural intact GB's were observed in the press-sintered samples. Magnetization and transport measurements showed that the composite carried over 1 MA/cm² critical current density ( J_c) at 5 K and self-field, while the pressed sintered MgB₂ has J_c ∼ 0.25 MA/cm² at 5 K and self-field. The origin of substantially higher J_c found in the composites is mostly due to their nano-sized grains and clean grain boundaries.

Original language	English
Pages (from-to)	3051-3055
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	13
Issue number	2 III
DOIs	https://doi.org/10.1109/TASC.2003.812070
State	Published - Jun 2003
Event	2002 Applied Superconductivity Conference - Houston, TX, United States Duration: Aug 4 2002 → Aug 9 2002

Keywords

Critical current
Grain boundary
MgB superconductors
Nano-composites

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10.1109/TASC.2003.812070

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title = "Comparative studies of MgB2/Mg nano-composites and press-sintered MgB2 pellets",

abstract = "We present our studies of superconducting and microstructural properties of bulk MgB2/Mg nano-composites and press-sintered MgB2. TEM investigation revealed that the composites are very dense, consisting of nano-sized MgB2 grains connected by the well-defined clean grain boundaries (GB). Both amorphous and structural intact GB's were observed in the press-sintered samples. Magnetization and transport measurements showed that the composite carried over 1 MA/cm2 critical current density ( Jc) at 5 K and self-field, while the pressed sintered MgB2 has Jc ∼ 0.25 MA/cm2 at 5 K and self-field. The origin of substantially higher Jc found in the composites is mostly due to their nano-sized grains and clean grain boundaries.",

keywords = "Critical current, Grain boundary, MgB superconductors, Nano-composites",

author = "Qiang Li and L. Wu and Y. Zhu and Moodenbaugh, \{A. R.\} and Gu, \{G. D.\} and M. Suenaga and Ye, \{Z. X.\} and Fischer, \{D. A.\}",

year = "2003",

month = jun,

doi = "10.1109/TASC.2003.812070",

language = "English",

volume = "13",

pages = "3051--3055",

journal = "IEEE Transactions on Applied Superconductivity",

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number = "2 III",

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

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TY - JOUR

T1 - Comparative studies of MgB2/Mg nano-composites and press-sintered MgB2 pellets

AU - Li, Qiang

AU - Wu, L.

AU - Zhu, Y.

AU - Moodenbaugh, A. R.

AU - Gu, G. D.

AU - Suenaga, M.

AU - Ye, Z. X.

AU - Fischer, D. A.

PY - 2003/6

Y1 - 2003/6

N2 - We present our studies of superconducting and microstructural properties of bulk MgB2/Mg nano-composites and press-sintered MgB2. TEM investigation revealed that the composites are very dense, consisting of nano-sized MgB2 grains connected by the well-defined clean grain boundaries (GB). Both amorphous and structural intact GB's were observed in the press-sintered samples. Magnetization and transport measurements showed that the composite carried over 1 MA/cm2 critical current density ( Jc) at 5 K and self-field, while the pressed sintered MgB2 has Jc ∼ 0.25 MA/cm2 at 5 K and self-field. The origin of substantially higher Jc found in the composites is mostly due to their nano-sized grains and clean grain boundaries.

AB - We present our studies of superconducting and microstructural properties of bulk MgB2/Mg nano-composites and press-sintered MgB2. TEM investigation revealed that the composites are very dense, consisting of nano-sized MgB2 grains connected by the well-defined clean grain boundaries (GB). Both amorphous and structural intact GB's were observed in the press-sintered samples. Magnetization and transport measurements showed that the composite carried over 1 MA/cm2 critical current density ( Jc) at 5 K and self-field, while the pressed sintered MgB2 has Jc ∼ 0.25 MA/cm2 at 5 K and self-field. The origin of substantially higher Jc found in the composites is mostly due to their nano-sized grains and clean grain boundaries.

KW - Critical current

KW - Grain boundary

KW - MgB superconductors

KW - Nano-composites

UR - https://www.scopus.com/pages/publications/0041975078

U2 - 10.1109/TASC.2003.812070

DO - 10.1109/TASC.2003.812070

M3 - Conference article

AN - SCOPUS:0041975078

SN - 1051-8223

VL - 13

SP - 3051

EP - 3055

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 -

Comparative studies of MgB₂/Mg nano-composites and press-sintered MgB₂ pellets

Abstract

Keywords

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