Improved superconducting properties in Ti-doped MgB2 prepared by two-step reaction method and high-energy ball milling

Yang, Fei; Li, S.Q.; Guo, Yan; Feng, Jianqing; Xiong, Xiaohui; Zhang, S.N.; Wang, Q.Y.; liu, G.Q.; Pang, Yuchun; Zou, Hongyan; Li, C.S.; Feng, Yang

doi:10.1016/j.jallcom.2014.10.186

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…This expression has been used to get a broad insight of different flux pinning mechanisms with different p and q values of the superconductors . Most reports indicate that the flux pinning force of pure MgB 2 comes from the flux line shear with the normal surface pinning centers, , the grain boundaries, with p = 1 / 2 and q = 2 and the peak position near h = 0.2. Most nano particle doping in MgB 2 modify the p values to 1 with the peak position near h = 0.33 in the f p vs h curve, corresponding to normal point pinning. , Figure f compares the normalized flux pinning force with the standard normal surface pinning model and normal point pinning.…”

Section: Resultsmentioning

confidence: 99%

Artificial 2D Flux Pinning Centers in MgB₂ Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Liu

et al. 2019

ACS Appl. Nano Mater.

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Systemic investigation was carried out on the microstructure, superconducting properties, and flux pinning mechanism of MgB 2 in situ fabricated with magnesium and g-C 3 N 4 coated boron as precursors. The encapsulation of the boron powders with g-C 3 N 4 was achieved by polycondensation of urea on boron powders. The g-C 3 N 4 decomposes during the MgB 2 fabrication to induce two-dimensional few-carbon layer, dispersed nanoparticles, and carbon-rich phases in the matrix to enhance the flux pinning force and H irr of MgB 2 , which accounts for the in-field critical current density (J c (H)) increase compared to the pure MgB 2 . The carbon layers acting as artificial twodimensional flux pinning centers, have demonstrated high flux pinning efficiency to increase the J c (H) of MgB 2 superconductors. KEYWORDS: MgB 2 superconductor, two-dimensional flux pinning center, g-C 3 N 4 , critical current density, connectivity

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Section: Resultsmentioning

confidence: 99%

Artificial 2D Flux Pinning Centers in MgB₂ Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Liu

et al. 2019

ACS Appl. Nano Mater.

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“…It is well known that additives and dopants such as carbon in various forms, Ti, Cu, Fe, SiC and others result in a great degradation of T c . The MgB 2 prepared from the ultra-sonicated boron is a high-quality superconductor, free of impurities from solvents [19,121,146,157,158]. This is an advantage concerning ball milling, where carbon, oxygen etc.…”

Section: Ultra-sonically Refined Boronmentioning

confidence: 99%

Review on high-performance bulk MgB₂ superconductors

Muralidhar,

Shadab,

Sai Srikanth

et al. 2023

J. Phys. D: Appl. Phys.

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Although the fascinating effect of superconductivity was discovered more than one hundred years ago, only a few low-temperature superconductors, especially Nb3Sn and NbTi, have reached everyday-life use. After the discovery of superconductivity in MgB2 in 2001, a boom appeared in interest in employing MgB2 in commercial applications, facilitated by simple crystallographic structure, high critical temperature, low-cost raw ingredients, simple and fast production, and other advantages for moderate temperature applications. It only lacks high flux pinning and good mechanical performance. In this review, the implications of manufacturing procedures on the superconducting properties, crystal and electronic structure of MgB2 are discussed. The advantages and drawbacks of various manufacturing processes will be presented, as well as the ways how to improve MgB2 superconducting performance. The impact of oxygen reduction, elements doping, the introduction of defects and additives, and the effect of precursor refinement on superconducting properties are here compiled to give an overview of the progress of flux pinning enhancement in bulk MgB2.

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“…Substitution at the Mg site, B site, or the addition of other elements/ compounds to the MgB2 has been carried out. Partial substitutions of Ti, Zn, Cu, Al for Mg site [3][4][5][6] have been carried out, including the addition of CNTs, nano-carbon, for B site [4,7,8]. Some reports have indicated that the carbon substitution at B site is effective to improve the superconductivity properties [9,10].…”

Section: Introductionmentioning

confidence: 99%

Influence of CNTs addition on structural and superconducting properties of mechanically alloyed MgB<sub>2</sub>

et al. 2020

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The result of adding carbon nanotubes (CNTs) to the lattice parameters, critical temperature and electrical resistivity of the MgB2 superconductors is reported. Structurally, the addition of CNTs was found to decrease the a-lattice from 3.086 Ã… of CNTs free sample to 3.078 Ã… and 3.074 Ã… of 5% and 10% CNTs added samples due to a substitution of C at the B site which presence in the form of Mg(B1-xCx)2 main phase. The doping level x of CNTs added samples were 2.25 at% and 3.75 at% respectively. The unreacted CNTs presence as the second phase and further acting as the suppression agent for crystallite growth. The addition of CNTs is also to refine the grain size and improves the grain connectivity. Samples show a metallic behavior which observed only at temperatures above ~41 K, below which, a sharp transition of resistivity occurred toward zero resistivity, confirming the superconductivity behavior. This study concluded that the effect of CNTs addition affects the structural parameters and superconducting properties. The addition of the CNTs to 5% and 10% has changed the zero critical temperature of the sample material to respectively 39.20 and 38.02 K from 39.31 K of CNTs free sample.

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Improved superconducting properties in Ti-doped MgB2 prepared by two-step reaction method and high-energy ball milling

Cited by 8 publications

References 20 publications

Artificial 2D Flux Pinning Centers in MgB₂ Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Artificial 2D Flux Pinning Centers in MgB₂ Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Review on high-performance bulk MgB₂ superconductors

Influence of CNTs addition on structural and superconducting properties of mechanically alloyed MgB<sub>2</sub>

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Improved superconducting properties in Ti-doped MgB2 prepared by two-step reaction method and high-energy ball milling

Cited by 8 publications

References 20 publications

Artificial 2D Flux Pinning Centers in MgB2 Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Artificial 2D Flux Pinning Centers in MgB2 Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Review on high-performance bulk MgB2 superconductors

Influence of CNTs addition on structural and superconducting properties of mechanically alloyed MgB<sub>2</sub>

Contact Info

Product

Resources

About

Artificial 2D Flux Pinning Centers in MgB₂ Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Artificial 2D Flux Pinning Centers in MgB₂ Induced by Graphitic-Carbon Nitride Coated on Boron for Superconductor Applications

Review on high-performance bulk MgB₂ superconductors