Superconducting properties of sintered bulk MgB2 prepared from hexane-mediated high-energy-ultra-sonicated boron

Arvapalli, Sai Srikanth; Muralidhar, M.; Pinmangkorn, S.; Jirsa, M.; Murakami, Masato

doi:10.1016/j.mseb.2020.115030

Cited by 13 publications

(10 citation statements)

References 31 publications

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“…The critical current density values at various fields like 0, 0.5 and 1 T at 20 K of MgB2 specimens prepared from boron ultra-sonicated in hexane for various durations shows (see figure 4 (b)) that 30 minutes was optimum ultra-sonication duration as it results in optimum particle refinement while avoiding clustering of boron particles. Detailed information can be found elsewhere [17]. The dominance of this bulk at extended field range can be attributed to flux pinning from the refined MgB2 grains.…”

Section: Resultsmentioning

confidence: 93%

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Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB₂

Arvapalli

Jirsa

Murakami

et al. 2022

J. Phys.: Conf. Ser.

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The large coherence length of MgB2 material allows large defects such as grain boundaries to act as strong pinning centres. As an alternative to the high-cost commercial nano precursors, we used a novel ultra-sonication technique to refine a cheap rough boron precursor and avoid the use of the expensive commercial nano amorphous boron powder. Recent novel low-cost ultra-sonication technique proved to improve the critical current density, J c, of MgB2. Here, we discuss the consequences of ultra-sonication duration in hexane medium on the boron precursor as well as the superconducting properties of MgB2 bulks. XRD revealed small peaks corresponding to unreacted Mg. First derivative of susceptibility was plotted as a function of temperature to explain the Tc,onset and ΔTc. J c was found to grow if the MgB2 bulk was prepared of boron ultra-sonicated for up to 30 minutes and then reduced with further boron ultra-sonication (60 minutes). SEM micrographs showed that boron powder subjected to longer ultra-sonication resulted in agglomeration of broken boron particles, forming large MgB2 grains. Based on the comparison of superconducting properties with previous results, we speculate that viscosity of the ultra-sonication medium might have a crucial role in the refinement of boron precursor powder.

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Section: Resultsmentioning

confidence: 93%

“…More information such as working principle of the ultrasonic treatment can be found in Refs. [15,17].…”

Section: Methodsmentioning

confidence: 99%

Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB₂

Arvapalli

Jirsa

Murakami

et al. 2022

J. Phys.: Conf. Ser.

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“…This technique is scalable and does not result in B 2 O 3 formation and contamination by other impurities. It proved to be a cost-effective way, how to refine the cheap commercial micro-crystalline boron to nanoscale [153][154][155]. The ultra-sonicated boron increased grain boundary pinning and resulted in a high J c .…”

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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“…In this method, individual 211 particles with sharp edges were produced by high-energy ultrasonic irradiation reducing the micron sized starting powders to ~100 nm size. Employing these pre-treated and new type of 211 phases, single grain YBCO was constructed via the IG process and demonstrated superior Jc and trapped fields improvements, without addition of any dopants or grain-refining agents [12,17].…”

Section: Introductionmentioning

confidence: 99%

High-energy ultrasonic irradiation effects on the growth and critical current density of top-seeded melt grown single grain YBa₂Cu₃O_7-δ bulk superconductors

Hagiwara

Ishibashi

Naik

et al. 2022

J. Phys.: Conf. Ser.

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The enhancement of a critical current density (J c) of REBa2Cu3O7-δ (REBCO/YBCO, where RE=rare earth elements and Y) bulk superconductors can be achieved via dispersing normal-conductive RE2BaCuO5 (Y211) particles and other defects which are of nano-metric size in the superconducting matrix. Recently, we demonstrated the integration of high-energy ultrasonic irradiation for fabricating high quality YBCO superconductors which effectively improved J c and trapped fields. In the present work, we investigated the effect of 30 mol.% of Y211 particle produced via high-energy ultrasonication irradiation on the growth and superconducting properties of top-seeded melt grown bulk YBCO single grains. Ultrasonic power of 450 W was employed for 30 minutes to create the sharp-edged, individual and nano-meter sized Y211 phase particles. Systematic isothermal experiments were conducted at various temperatures from 1005 °C − 980 °C. The growth of YBCO grain from a single crystalline NdBCO seed was initiated at 1000 °C and as the isothermal temperature decreased the growth area increased due to the improved peritectic reaction. The field dependence of J c was improved when the under-cooling isothermal temperature decreased. The present method is reliable, cost-effective, and free from any chemical contamination.

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Superconducting properties of sintered bulk MgB2 prepared from hexane-mediated high-energy-ultra-sonicated boron

Cited by 13 publications

References 31 publications

Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB₂

Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB₂

Review on high-performance bulk MgB₂ superconductors

High-energy ultrasonic irradiation effects on the growth and critical current density of top-seeded melt grown single grain YBa₂Cu₃O_7-δ bulk superconductors

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Superconducting properties of sintered bulk MgB2 prepared from hexane-mediated high-energy-ultra-sonicated boron

Cited by 13 publications

References 31 publications

Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB2

Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB2

Review on high-performance bulk MgB2 superconductors

High-energy ultrasonic irradiation effects on the growth and critical current density of top-seeded melt grown single grain YBa2Cu3O7-δ bulk superconductors

Contact Info

Product

Resources

About

Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB₂

Effect of boron precursor ultra-sonicated in hexane medium on the critical current density of sintered bulk MgB₂

Review on high-performance bulk MgB₂ superconductors

High-energy ultrasonic irradiation effects on the growth and critical current density of top-seeded melt grown single grain YBa₂Cu₃O_7-δ bulk superconductors