TY - JOUR
T1 - Enhancement of critical current density for MgB2 prepared using carbon-encapsulated boron with co-addition of Dy2O3 and La2O3
AU - Mohd Hapipi, Nurhidayah
AU - Miryala, Muralidhar
AU - Chen, Soo Kien
AU - Arvapalli, Sai Srikanth
AU - Murakami, Masato
AU - Kechik, Mohd Mustafa Awang
AU - Tan, Kar Ban
AU - Lee, Oon Jew
N1 - Funding Information:
This work is supported by Shibaura Institute of Technology, Japan under research exchange program and Ministry of Education Malaysia through the Fundamental Research Grant Scheme (Grant No.: FRGS/1/2018/STG07/UPM/02/1). The first author is also grateful to Pusat Pengurusan Wakaf, Zakat, dan Endowmen (WAZAN) Universiti Putra Malaysia and School of Graduate Studies, Universiti Putra Malaysia for financial support during the research exchange program.
Funding Information:
This work is supported by Shibaura Institute of Technology , Japan under research exchange program and Ministry of Education Malaysia through the Fundamental Research Grant Scheme (Grant No.: FRGS/1/2018/STG07/UPM/02/1 ). The first author is also grateful to Pusat Pengurusan Wakaf, Zakat, dan Endowmen (WAZAN) Universiti Putra Malaysia and School of Graduate Studies , Universiti Putra Malaysia for financial support during the research exchange program.
Publisher Copyright:
© 2020 The Author(s)
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - In this work, magnesium diboride, MgB2 samples were prepared by using magnesium, Mg powder and carbon-encapsulated boron, B powder (1.35 wt% carbon) with addition of dysprosium oxide, Dy2O3 and lanthanum oxide, La2O3 as dopants. Different weight percentages with the ratio of x wt.% Dy2O3: x wt.% La2O3 were used where x = 0.00, 0.25, 0.50, 0.75, 1.00, respectively. X-ray diffraction (XRD) results confirmed MgB2 as the major phase for all the samples. Magnetization measurement showed a slight decrease of critical temperature, Tc from 38.1 K to 37.6 K with the co-addition of Dy2O3 and La2O3. Self-field critical current density, Jc at 20 K increased with the increasing of co-addition levels probably due to improved grain coupling. The highest self-field Jc obtained is 433 kA cm−2 with 1.00 wt% co-addition level. Field dependent Jc (≤4 T) at 20 K of the co-added samples is higher compared to that of the pure one. The present results show that a small amount of Dy2O3 and La2O3 co-addition into MgB2 is effective to enhance flux pinning and Jc.
AB - In this work, magnesium diboride, MgB2 samples were prepared by using magnesium, Mg powder and carbon-encapsulated boron, B powder (1.35 wt% carbon) with addition of dysprosium oxide, Dy2O3 and lanthanum oxide, La2O3 as dopants. Different weight percentages with the ratio of x wt.% Dy2O3: x wt.% La2O3 were used where x = 0.00, 0.25, 0.50, 0.75, 1.00, respectively. X-ray diffraction (XRD) results confirmed MgB2 as the major phase for all the samples. Magnetization measurement showed a slight decrease of critical temperature, Tc from 38.1 K to 37.6 K with the co-addition of Dy2O3 and La2O3. Self-field critical current density, Jc at 20 K increased with the increasing of co-addition levels probably due to improved grain coupling. The highest self-field Jc obtained is 433 kA cm−2 with 1.00 wt% co-addition level. Field dependent Jc (≤4 T) at 20 K of the co-added samples is higher compared to that of the pure one. The present results show that a small amount of Dy2O3 and La2O3 co-addition into MgB2 is effective to enhance flux pinning and Jc.
KW - Carbon-encapsulated boron
KW - Critical current density
KW - DyO
KW - LaO
KW - MgB
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U2 - 10.1016/j.ceramint.2020.06.081
DO - 10.1016/j.ceramint.2020.06.081
M3 - Article
AN - SCOPUS:85086925633
VL - 46
SP - 23041
EP - 23048
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 14
ER -