Towards high degree of c-axis orientation in MgB2 bulks

Grigoroscuta, Mihai Alexandru; Aldica, G.; Burdusel, M.; Sandu, V.; Kuncser, Andrei; Pasuk, Iuliana; Ionescu, A.; Suzuki, Tohru; Vasylkiv, Oleg; Badica, P.

doi:10.1016/j.jma.2021.10.013

Cited by 2 publications

(2 citation statements)

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“…Figure 5 reveals that all the MgB 2 powder and bulks have a preferred orientation along the (101) plan. To investigate the variation of the MgB 2 crystal orientation perpendicular and parallel to the c-axis, the Lotgering factor, LF [21,22] of (h00) and (00l) was estimated with the following equation:…”

Section: Initial Precursors and Fs Samples Analysesmentioning

confidence: 99%

“…To address these issues, various techniques have been developed to enhance the effective pinning sites in MgB 2 , such as irradiation, chemical doping or substitution, precursor size refinement, and other methods [2,3]. Additionally, highly dense bulk MgB 2 samples can be elaborated through infiltration and growth process [4,5], hot pressing or hot isostatic pressing sintering [6,7] and spark plasma sintering (SPS) [8][9][10]. SPS is an unconventional rapid consolidation method that allows for the preparation of dense samples with complex shapes and/or large sizes.…”

Section: Introductionmentioning

confidence: 99%

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Overview of spark plasma synthesis and sintering of MgB₂ superconductor

Xing,

Bernstein,

Muralidhar

et al. 2023

Supercond. Sci. Technol.

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This study aims to investigate the flash sintering mechanisms of magnesium diborides using SPS and optimize the sintering process conditions. Three different precursor materials were used: i) commercial powder MgB2, ii) mixtures of magnesium and nano boron powder (Mg + 2B), and iii) mixtures of Mg and MgB4 powder for an "in-situ" reactive synthesis. The density of the obtained bulks exceeds 90 % of the theoretical density of the material. The structure and microstructure of the samples were analyzed using X-ray diffraction and SEM, which were correlated with their superconducting properties. The critical current density (Jc), pinning force (fp), and electrical resistivity (ρ) of the samples were also investigated. The results show that the in-situ reactive synthesis of MgB2 using magnesium and nano boron powder was the most effective method for producing high-quality samples with improved superconducting properties. The findings could lead to the development of more efficient methods for producing high-performance of MgB2 bulks.

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Section: Initial Precursors and Fs Samples Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overview of spark plasma synthesis and sintering of MgB₂ superconductor

Xing,

Bernstein,

Muralidhar

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

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Measurements of Surface Impedance in MgB2 in DC Magnetic Fields: Insights in Flux-Flow Resistivity

et al. 2022

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We present the multifrequency measurements of the surface resistance of spark-plasma-sintered MgB2 performed through a dielectric loaded resonator operating at 16.5 and 26.7 GHz. By normally applying magnetic fields ≤1.2 T to the sample surface, we drove it in the mixed state. By means of data-rooted analysis, we found that the sample vortex dynamics could be fully described within a single-component approach. Pinning phenomena were present and characterized by a depinning frequency smaller than the measurement ones. The multiband nature of the superconductor emerged in the flux-flow resistivity, whose field dependence could be interpreted well within theoretical models. By exploiting them, the upper critical field was extracted in the low-temperature range, which exhibited a consistent temperature trend with the values obtained at the onset of the resistive transition near Tc, and was well in line with literature data on other polycrystalline samples.

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Towards high degree of c-axis orientation in MgB2 bulks

Cited by 2 publications

References 57 publications

Overview of spark plasma synthesis and sintering of MgB₂ superconductor

Overview of spark plasma synthesis and sintering of MgB₂ superconductor

Measurements of Surface Impedance in MgB2 in DC Magnetic Fields: Insights in Flux-Flow Resistivity

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Towards high degree of c-axis orientation in MgB2 bulks

Cited by 2 publications

References 57 publications

Overview of spark plasma synthesis and sintering of MgB2 superconductor

Overview of spark plasma synthesis and sintering of MgB2 superconductor

Measurements of Surface Impedance in MgB2 in DC Magnetic Fields: Insights in Flux-Flow Resistivity

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Product

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Overview of spark plasma synthesis and sintering of MgB₂ superconductor

Overview of spark plasma synthesis and sintering of MgB₂ superconductor