High-field superconductivity in C-doped MgB2 bulk samples prepared by a rapid synthesis route

Matera, Davide; Bonura, Marco; Černý, Radovan; Walker, S. McKeown; Buta, F.; LeBoeuf, David; Chaud, X.; Giannini, E.; Senatore, Carmine

doi:10.1038/s41598-020-74300-9

Cited by 11 publications

(7 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Starting from ≈38 K at zero field, it rapidly decreases down to ≈10 K at 10 T magnetic field (see Figure 2). Although not suitable for the application at 5 K / 18 T, more advanced 𝑇𝑇 𝑐𝑐 performance has been reported for doped MgB2 materials, up to 10 K at 20 T [20]. Therefore, the materials should still be considered promising for the DEMO CS application, especially accounting for the direct possibility of using highly resistive materials for the wire manufacturing by industry.…”

Section: Materials Selectionmentioning

confidence: 99%

Co-Wound Superconducting Wire for Quench Detection in Fusion Magnets

Bykovskiy¹,

Uglietti

Bruzzone³

et al. 2022

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

High temperature superconducting (HTS) materials are widely utilized in various design proposals for fusion magnets, resulting in enhanced performance of the machines compared to the past. However, a reliable quench detection in HTS conductors remains an open issue. Using a co-wound superconducting wire of high normal state resistance as an electrically insulated and thermally coupled sensor provides strongly increased sensitivity for the voltage-based quench detection methods. Furthermore, resistance of the wire can be practically proportional to the size of the normal zone, even though the location of the hot-spot cannot be identified. We present adaptation of this method for fusion conductors by considering various wire options, such as MgB2 wires in a highly resistive matrix, non-stabilized Nb3Sn wires and (K,Na)-Ba122 wires. The insulated wire of a small diameter (<1 mm) can be embedded in the steel jacket, thus barely affecting the conductor design and manufacturing aspects. Alternatively, if installed within the cable space, the wires might even allow monitoring of quench dynamics among the strands. Our first experimental demonstration is planned in a sub-scale ReBCO cable-in-conduit sample, which will be tested in the SULTAN test facility recently upgraded for DC operation in resistive samples with the transport currents up to 15 kA and maximum voltage of 10 V.

show abstract

Section: Materials Selectionmentioning

confidence: 99%

Co-Wound Superconducting Wire for Quench Detection in Fusion Magnets

Bykovskiy¹,

Uglietti

Bruzzone³

et al. 2022

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

show abstract

“…4 reports the variation of Rs with the pressure as measured at 77 K on this sample. To characterize the variation of Rs in a wider temperature range, we further investigated Sample A by means of a lownoise probe for electrical transport measurements described in [28]. The results of this investigation are reported in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…We used the pressure device shown in Fig. 1 (c) to measure Rs from room temperature down to 77 K, and to evaluate the effect of the pressure on Rs at 77 K. We used the probe for electrical transport measurements described in [28] to measure Rs in a wider range of temperatures down to  10 K. This probe was not calibrated to determine the actual pressure acting on the CC sandwich. We measured the thickness of the MIT layers by means of a Tencor TM profilometer from KLA.…”

Section: Experimental Techniquementioning

confidence: 99%

Contact Resistance Between REBCO Coated Conductors in the Presence of a V₂O₃ Inter-Layer

Bonura

Bovone

Cayado

et al. 2023

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

We report a study of the contact resistance between commercial Cu-stabilized REBCO tapes coated with V2O3, which is a functional material that passes through a metal-to-insulator transition at cryogenic temperatures. We prove that a simple dip coating technique, potentially scalable to coat long-length conductors, allows the deposition of  10-m-thick V2O3 layers. We find that the contact resistance between the REBCO tapes is mainly determined by the properties of the V2O3 layer and that it varies by more than 8 orders of magnitude from 10 K to room temperature. Based on our experimental results and on previous studies [1], we deduce that an effective quench propagation may take place in REBCO pancake coils when the hot spot temperature is in the range 135 K -175 K, depending on the V2O3 layer thickness. Because of the metal-to-insulator transition of the V2O3, the contact resistance rapidly increases at lower temperatures, assuming values comparable with those of insulated coils. In a general perspective, the results of this research can help magnet designers to assess the role of metal-to-insulator-transition materials for future REBCO-based magnets.

show abstract

“…suggests that B is not arranged in hexagonal structure which is necessary for the formation of MgB 2 45 .…”

Section: Discussionmentioning

confidence: 99%

Boron From Net Charge Acceptor to Donor and Its Effect on Hydrogen Uptake by Novel Mg-B-electrochemically Synthesized Reduced Graphene Oxide

Marla

Panda

Tatiparti

2020

Preprint

View full text Add to dashboard Cite

Hydrogen uptake (H-uptake) is studied in ball milled Mg-B-electrochemically synthesized reduced graphene oxide (erGO) nanocomposites at PH2≈15 bar, ~320 ℃. B/C (weight ratio): 0, ~0.09, ~0.36, ~0.90 are synthesized maintaining erGO≈10wt %. B occupies octahedral interstices within Mg unit cell - revealed by electron density maps. Persistent charge donations from Mg and B to C appear as Mg-C (~283.2 eV), B-C (~283.3-283.9 eV) interactions in C-1s core X-ray photoelectron spectrometry (XPS) at all B/C. At B/C>0.09, charge reception by B from Mg yields Mg-B interaction (51.3 eV, Mg-2p XPS). This net charge acceptor role of B does not alter Mg unit cell size significantly. Despite charge donation to both C and B, the Mg charge is <+2, resulting in long incubation times (>5 h) at B/C>0.09. In B/C≈0.09, C-2p π→π* transition (~290 eV, C-1s XPS) is also seen. Absence of Mg-B interaction renders B a charge donor, resulting in Mg-B repulsion and Mg unit cell expansion. Mg-C peak shift to lower binding energies (C-1s XPS), decreases incubation time to 2.25 h and increases H-uptake kinetics. Various atomic interactions influence the reduction of incubation time in H-uptake and increase its kinetics in the order: (Mg→C; B→C)B/C≈0.09 > (Mg→C)B/C=0 > (ternary Mg→B→C)B/C>0.09.

show abstract

High-field superconductivity in C-doped MgB2 bulk samples prepared by a rapid synthesis route

Cited by 11 publications

References 61 publications

Co-Wound Superconducting Wire for Quench Detection in Fusion Magnets

Co-Wound Superconducting Wire for Quench Detection in Fusion Magnets

Contact Resistance Between REBCO Coated Conductors in the Presence of a V₂O₃ Inter-Layer

Boron From Net Charge Acceptor to Donor and Its Effect on Hydrogen Uptake by Novel Mg-B-electrochemically Synthesized Reduced Graphene Oxide

Contact Info

Product

Resources

About

High-field superconductivity in C-doped MgB2 bulk samples prepared by a rapid synthesis route

Cited by 11 publications

References 61 publications

Co-Wound Superconducting Wire for Quench Detection in Fusion Magnets

Co-Wound Superconducting Wire for Quench Detection in Fusion Magnets

Contact Resistance Between REBCO Coated Conductors in the Presence of a V2O3 Inter-Layer

Boron From Net Charge Acceptor to Donor and Its Effect on Hydrogen Uptake by Novel Mg-B-electrochemically Synthesized Reduced Graphene Oxide

Contact Info

Product

Resources

About

Contact Resistance Between REBCO Coated Conductors in the Presence of a V₂O₃ Inter-Layer