Exploration of the Effect of Oxygen on Superconductivity in MgB2 Bulk by Using Boron Powder with Different Particle and Purification

Yang, Liangqun; Suo, Hongli; Ma, Lin; Liu, Min; Zhao, Wanli; Liu, Jianhua; Wang, Lei; Zhang, Zili; Wang, Qiuliang

doi:10.3390/cryst11030278

Open AccessArticle

Exploration of the Effect of Oxygen on Superconductivity in MgB₂ Bulk by Using Boron Powder with Different Particle and Purification

by

Liangqun Yang

¹,

Hongli Suo

^1,*,

Lin Ma

¹,

Min Liu

¹,

Wanli Zhao

¹,

Jianhua Liu

²,

Lei Wang

²,

Zili Zhang

^2,* and

Qiuliang Wang

^2,3

¹

Beijing University of Technology, Beijing 100124, China

²

Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

³

University of Chinese Academy of Sciences, Beijing 100049, China

^*

Authors to whom correspondence should be addressed.

Crystals 2021, 11(3), 278; https://doi.org/10.3390/cryst11030278

Submission received: 8 February 2021 / Revised: 27 February 2021 / Accepted: 5 March 2021 / Published: 11 March 2021

(This article belongs to the Section Inorganic Crystalline Materials)

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Abstract

In this study, boron powder with different particle sizes was purified by both chemical and heat treatment methods. The reduction in the particle size can improve the chemical purification with no effort on the heat treatment. The superconducting properties of the powder drastically changed even with only a partial elimination of oxygen. On the one hand, less oxygen content resulted in high T_c and J_c values under the low magnetic field, and most importantly, a significant improvement in the superconducting connectivity (A_f value). On the other hand, the degradation of J_c under a high field and a change in the pinning mechanism were also found, along with decreasing oxygen. This result indicated that oxygen, probably MgO, might act as the pinning center and as an obstacle for the supercurrent in MgB₂ at the same time. This work paves the way for obtaining pure oxygen-free MgB₂ and understanding the real effect of oxygen in MgB₂.

Keywords: boron powder; purification; particle size; MgB₂; superconducting connectivity

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MDPI and ACS Style

Yang, L.; Suo, H.; Ma, L.; Liu, M.; Zhao, W.; Liu, J.; Wang, L.; Zhang, Z.; Wang, Q. Exploration of the Effect of Oxygen on Superconductivity in MgB₂ Bulk by Using Boron Powder with Different Particle and Purification. Crystals 2021, 11, 278. https://doi.org/10.3390/cryst11030278

AMA Style

Yang L, Suo H, Ma L, Liu M, Zhao W, Liu J, Wang L, Zhang Z, Wang Q. Exploration of the Effect of Oxygen on Superconductivity in MgB₂ Bulk by Using Boron Powder with Different Particle and Purification. Crystals. 2021; 11(3):278. https://doi.org/10.3390/cryst11030278

Chicago/Turabian Style

Yang, Liangqun, Hongli Suo, Lin Ma, Min Liu, Wanli Zhao, Jianhua Liu, Lei Wang, Zili Zhang, and Qiuliang Wang. 2021. "Exploration of the Effect of Oxygen on Superconductivity in MgB₂ Bulk by Using Boron Powder with Different Particle and Purification" Crystals 11, no. 3: 278. https://doi.org/10.3390/cryst11030278

APA Style

Yang, L., Suo, H., Ma, L., Liu, M., Zhao, W., Liu, J., Wang, L., Zhang, Z., & Wang, Q. (2021). Exploration of the Effect of Oxygen on Superconductivity in MgB₂ Bulk by Using Boron Powder with Different Particle and Purification. Crystals, 11(3), 278. https://doi.org/10.3390/cryst11030278

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Exploration of the Effect of Oxygen on Superconductivity in MgB₂ Bulk by Using Boron Powder with Different Particle and Purification

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