Spark plasma sintering of MgB2 in the two-temperature route

Aldica, G.; Batalu, Dan; Popa, S.; Ivan, I.; Niţă, P.; Sakka, Yoshio; Vasylkiv, Oleg; Miu, L.; Pasuk, Iuliana; Badica, P.

doi:10.1016/j.physc.2012.01.023

Cited by 63 publications

(38 citation statements)

References 38 publications

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“…A clear tendency of the relative density with the amount of GeO 2 was not observed: sample "C" shows the highest relative density, while samples "B" and "D" have a slightly lower relative density than for pristine sample. It is important to note that the influence of density when above 90% on J c -values was found to be very low [32,39].…”

Section: Resultsmentioning

confidence: 98%

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GeO 2 -added MgB 2 superconductor obtained by Spark Plasma Sintering

Batalu

Aldica

Popa

et al. 2015

Solid State Sciences

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Section: Resultsmentioning

confidence: 98%

“…The powders were mixed to obtain the composition MgB 2 (GeO 2 ) x , where x ¼ 0.005, 0.01, and 0.03. Mixtures with indicated compositions were loaded into a graphite die of~2 cm diameter and sintered by SPS (FCT Systeme GmbH e HP D 5, Germany) for 3 min at 1150 C and about 35 Pa, under a uniaxial pressure of 95 MPa [32].…”

Section: Methodsmentioning

confidence: 99%

GeO 2 -added MgB 2 superconductor obtained by Spark Plasma Sintering

Batalu

Aldica

Popa

et al. 2015

Solid State Sciences

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“…The most attractive advantage of this method is quite a short synthesis time, typically ∼15 min for MgB 2 , which is expected to strongly suppress the grain growth. Actually, almost the same crystallite size was observed between the raw starting and the SPS-processed MgB 2 powders [32]. After the discovery of superconductivity in MgB 2 [33], the B T of 1 T at 27.5 K was promptly reported for a SPS-processed MgB 2 bulk with 30 mm diameter [3].…”

Section: Introductionmentioning

confidence: 86%

Optimization of vortex pinning at grain boundaries onex-situMgB₂bulks synthesized by spark plasma sintering

Naito

Endo

Fujishiro

2017

Supercond. Sci. Technol.

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Grain boundaries are well known to be the predominant pinning centers in MgB 2 superconductors. To study the effects of grain boundaries on the trapped field properties of MgB 2 bulk, we prepared MgB 2 bulks by a spark plasma sintering method using a ball-milled starting powder. The trapped field was maximized for the bulk made from the ball-milled powder with crystallite size, τ, of 27 nm; the highest trapped field, B T , of 2.3 T achieved at 19.3 K was 1.2 times larger than that of the bulk made from the non ball-milled powder (τ = 50 nm). The degradation of the trapped field for the bulk from finer powder (τ = 6 nm) originated mainly from the lowered T c. The critical current density, J c , and the pinning force density, F p , were also maximized for the bulk from τ = 27 nm. The competition between the increase of the numerical density of grain boundaries and the degradation of superconductivity determined the vortex pinning properties for the MgB 2 bulks with mechanically refined grains. The scaling analysis for the pinning force density suggested that the change in the dimension of the dominant pinning source from 2D (surface) to 0D (point) was induced by grain refining. Although the nanometric impurity particles such as MgB 4 , MgO and Mg-B-O were created in the bulk during both ballmilling and spark plasma sintering processes, we considered the point-contact between the refined grains was the predominant point pinning source.

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“…The influence of density when above 90 % on J c values was found to be very low [11,17]. In our SPSed pristine and added MgB 2 sample, secondary phases MgB 4 , MgO, and Mg 2 Ge occur (Fig.…”

Section: Resultsmentioning

confidence: 50%

Ge-Added MgB2 Superconductor Obtained by Ex Situ Spark Plasma Sintering

Batalu

Aldica

Burdusel

et al. 2014

J Supercond Nov Magn

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Spark plasma sintering (SPS) was applied for fabrication of dense (relative density > 97 %) bulk MgB 2 samples added with Ge. Mixtures of MgB 2 and Ge powders with starting compositions (MgB 2 )Ge x , x = 0.005, 0.01, and 0.03 were used. Added samples show enhancement of the critical current density at high magnetic fields when compared to a pristine reference sample. The optimum composition is for x = 0.005 and for this sample J c (20 K) = 10 2 A/cm 2 is obtained at 5 T, while for the reference sample is obtained at 3.9 T. Ge does not substitute in the crystal lattice of MgB 2 and T c,onset or T c,midpoint from magnetization measurements scatter within 0.15 or 0.3 K, respectively.

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Spark plasma sintering of MgB2 in the two-temperature route

Cited by 63 publications

References 38 publications

GeO 2 -added MgB 2 superconductor obtained by Spark Plasma Sintering

GeO 2 -added MgB 2 superconductor obtained by Spark Plasma Sintering

Optimization of vortex pinning at grain boundaries onex-situMgB₂bulks synthesized by spark plasma sintering

Ge-Added MgB2 Superconductor Obtained by Ex Situ Spark Plasma Sintering

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Spark plasma sintering of MgB2 in the two-temperature route

Cited by 63 publications

References 38 publications

GeO 2 -added MgB 2 superconductor obtained by Spark Plasma Sintering

GeO 2 -added MgB 2 superconductor obtained by Spark Plasma Sintering

Optimization of vortex pinning at grain boundaries onex-situMgB2bulks synthesized by spark plasma sintering

Ge-Added MgB2 Superconductor Obtained by Ex Situ Spark Plasma Sintering

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Optimization of vortex pinning at grain boundaries onex-situMgB₂bulks synthesized by spark plasma sintering