Effect of Packing Density on Critical Current Density at High Magnetic Fields in Polycrystalline MgB<sub>2</sub>Superconductors

Matsushita, Teruo; Tanigawa, Junya; Kiuchi, M.; Yamamoto, Akiyasu; Shimoyama, Jun–ichi; Kishio, K.

doi:10.7567/jjap.51.123103

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…It should be noted the scaling of the normalized pinning force is done based on the reduced field by B irr with h ¼ B/B irr instead of B c2 with h ¼ B/B c2 due to the facts that the difference between B c2 and B irr is sizable, and is more significant at low temperature regime in the case of pnictides, MgB 2 and cuprates. 7,29,32,38,39 The temperature dependence of B c2 and B irr obtained from q-T curves (see the inset in Fig. 3) clearly reveal the B irr is far below the B c2 .…”

mentioning

confidence: 81%

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

Shahbazi

Wang

Choi

et al. 2013

Applied Physics Letters

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The flux pinning mechanism of BaFe1.9Ni0.1As2 superconducting crystals have been investigated systematically by magnetic measurements up to 13 T at various temperatures. The field dependence of the critical current density, Jc, was analysed within the collective pinning model. A remarkably good agreement between the experimental results and theoretical δl pinning curve is obtained, which indicates that pinning in BaFe1.9Ni0.1As2 crystal originates from spatial variation of the mean free path. Moreover, the normalized pinning force density, Fp, curves versus h = B/Birr (Birr is the irreversibility field) were scaled using the Dew-Hughes model. Analysis suggests that point pinning alone cannot explain the observed field variation of Fp.

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mentioning

confidence: 81%

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

Shahbazi

Wang

Choi

et al. 2013

Applied Physics Letters

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“…In the current study, the I c factor, defined as a value of the final packing density multiplied by the area of the powder mixture, was used to indirectly estimate the critical current (I c ) of the multi-filamentary MgB 2 wire. Generally, the I c can be enhanced by increasing the J c or a superconducting area ( ∵I c = J c A sc , where A sc is the superconducting area) [46][47][48]. It is well known that an increase in J c can be Fig.…”

Section: Wire Drawing Simulationmentioning

confidence: 99%

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

Lee

Chung

et al. 2021

Met. Mater. Int.

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Numerical modeling was conducted to investigate the deformation behavior of powder mixture during multi-pass drawing processes for multi-filamentary MgB 2 wire. A modified Drucker-Prager Cap (DPC) model with an elliptical cap surface using the new material characterization method was developed to capture the anisotropic hardening behavior and hydrostatic effect of the powder mixture. A number of uniaxial die compaction, cold isostatic pressing, diametrical compression, and uniaxial compression tests were conducted using different powder densities to characterize the modified DPC model. A commercial finite element software ABAQUS with a user subroutine was used to simulate the drawing of the MgB 2 wire. The density and area fraction of the powder mixture during the wire-drawing process were verified with experimental results. The difference in packing density at the inner and outer filaments of the MgB 2 wire was successfully captured by simulation. In addition, the effect of the initial packing density on the superconducting properties of MgB 2 wire was numerically studied. It is shown that the increase in the superconducting area, which results from a high initial packing density, should be more effective compared to the increase in the grain connectivity in enhancing the critical current properties for the MgB 2 wire when the final packing density is saturated after a number of drawing processes.

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Effect of Packing Density on Critical Current Density at High Magnetic Fields in Polycrystalline MgB₂Superconductors

Cited by 2 publications

References 17 publications

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

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Effect of Packing Density on Critical Current Density at High Magnetic Fields in Polycrystalline MgB2Superconductors

Cited by 2 publications

References 17 publications

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

Flux pinning mechanism in BaFe1.9Ni0.1As2 single crystals: Evidence for fluctuation in mean free path induced pinning

Superconducting MgB2 Wire Drawing Considering Anisotropic Hardening Behavior and Hydrostatic Effect

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Effect of Packing Density on Critical Current Density at High Magnetic Fields in Polycrystalline MgB₂Superconductors