Enhancement of critical current density by a “MgB2-MgB4” reversible reaction in self-sintered ex-situ MgB2bulks

Junming Peng; Qi Cai; Fang Cheng; Zongqing Ma; Chong Li; Ying Xin; Yongchang Liu

doi:10.1016/j.jallcom.2016.09.312

Enhancement of critical current density by a “MgB₂-MgB₄” reversible reaction in self-sintered ex-situ MgB₂bulks

Junming Peng, Qi Cai, Fang Cheng, Zongqing Ma^*, Chong Li, Ying Xin, Yongchang Liu

^*Corresponding author for this work

Tianjin University

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

15 Citations (Scopus)

Abstract

Self-sintered ex-situ MgB₂polycrystalline bulks have experienced a two-step sintering process, initially at 900 °C for 0–20 min and then at 650 °C for 1 h. MgB₂was decomposed to MgB₄and Mg at 900 °C and composed again at 650 °C from MgB₄and Mg. The reversible reaction promotes the material migration, and thus eliminates pores and enhances the connectivity between the grains. The critical current density (J_c) is significantly improved due to both improved grain connectivity and the additive pinning centers such as MgB₄and new-born boundaries. This two-step sintering process can be a promising method to fabricate high-performance ex-situ MgB₂bulks and wires.

Original language	English
Pages (from-to)	24-29
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	694
DOIs	https://doi.org/10.1016/j.jallcom.2016.09.312
Publication status	Published - 2017
Externally published	Yes

Keywords

MgB
MgBsuperconductor
Reversible reaction

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10.1016/j.jallcom.2016.09.312

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title = "Enhancement of critical current density by a “MgB2-MgB4” reversible reaction in self-sintered ex-situ MgB2bulks",

abstract = "Self-sintered ex-situ MgB2polycrystalline bulks have experienced a two-step sintering process, initially at 900 °C for 0–20 min and then at 650 °C for 1 h. MgB2was decomposed to MgB4and Mg at 900 °C and composed again at 650 °C from MgB4and Mg. The reversible reaction promotes the material migration, and thus eliminates pores and enhances the connectivity between the grains. The critical current density (Jc) is significantly improved due to both improved grain connectivity and the additive pinning centers such as MgB4and new-born boundaries. This two-step sintering process can be a promising method to fabricate high-performance ex-situ MgB2bulks and wires.",

keywords = "MgB, MgBsuperconductor, Reversible reaction",

author = "Junming Peng and Qi Cai and Fang Cheng and Zongqing Ma and Chong Li and Ying Xin and Yongchang Liu",

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year = "2017",

doi = "10.1016/j.jallcom.2016.09.312",

language = "English",

volume = "694",

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TY - JOUR

T1 - Enhancement of critical current density by a “MgB2-MgB4” reversible reaction in self-sintered ex-situ MgB2bulks

AU - Peng, Junming

AU - Cai, Qi

AU - Cheng, Fang

AU - Ma, Zongqing

AU - Li, Chong

AU - Xin, Ying

AU - Liu, Yongchang

PY - 2017

Y1 - 2017

N2 - Self-sintered ex-situ MgB2polycrystalline bulks have experienced a two-step sintering process, initially at 900 °C for 0–20 min and then at 650 °C for 1 h. MgB2was decomposed to MgB4and Mg at 900 °C and composed again at 650 °C from MgB4and Mg. The reversible reaction promotes the material migration, and thus eliminates pores and enhances the connectivity between the grains. The critical current density (Jc) is significantly improved due to both improved grain connectivity and the additive pinning centers such as MgB4and new-born boundaries. This two-step sintering process can be a promising method to fabricate high-performance ex-situ MgB2bulks and wires.

AB - Self-sintered ex-situ MgB2polycrystalline bulks have experienced a two-step sintering process, initially at 900 °C for 0–20 min and then at 650 °C for 1 h. MgB2was decomposed to MgB4and Mg at 900 °C and composed again at 650 °C from MgB4and Mg. The reversible reaction promotes the material migration, and thus eliminates pores and enhances the connectivity between the grains. The critical current density (Jc) is significantly improved due to both improved grain connectivity and the additive pinning centers such as MgB4and new-born boundaries. This two-step sintering process can be a promising method to fabricate high-performance ex-situ MgB2bulks and wires.

KW - MgB

KW - MgBsuperconductor

KW - Reversible reaction

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U2 - 10.1016/j.jallcom.2016.09.312

DO - 10.1016/j.jallcom.2016.09.312

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SN - 0925-8388

VL - 694

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Enhancement of critical current density by a “MgB₂-MgB₄” reversible reaction in self-sintered ex-situ MgB₂bulks

Abstract

Keywords

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