Investigation on superconducting and magnetic levitation force behaviour of excess Mg doped-bulk MgB2 superconductors

Güner, Sait Barış; Savaskan, Burcu; Öztürk, K.; Çelık, Şükrü; Aksoy, Canan; Karaboğa, Fırat; Koparan, Ezgi Taylan; Yanmaz, E.

doi:10.1016/j.cryogenics.2019.05.002

Cited by 17 publications

(4 citation statements)

References 47 publications

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“…This case is the cause of smaller going up cycle than going down cycle. As compared Fig.3 and Fig.4, it can be said that the attractive force under FC regime is higher than under ZFC regime as the repulsive force under ZFC regime is higher than under FC regime and there is a good relation with the literature [28][29][30].…”

Section: Resultsmentioning

confidence: 58%

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Güner

2020

Sakarya University Journal of Science

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We investigated the microstructure and magnetic properties of Gd123:Gd211 = 1-y : y (y = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) bulk superconductors with the diameter of 13 mm and thickness of 5 mm fabricated by melt-textured method. The vertical levitation force between melt-textured bulk superconductors and a permanent magnet is measured at 30, 40, 50, 60, and 77 K under zero-field-cooling (ZFC) and field-cooling (FC) regimes by Magnetic Levitation Force Measurement System (MLFMS). The phase and microstructures properties of all samples are determined by SEM (Scanning Electron Microscope) and analysed that the pore sizes in the matrix decrease by adding Gd211 particles into Gd123 samples. The measurements of superconducting characteristics showed that the maximum vertical levitation forces of the G1 sample were noted as 3.04, 2.30, 1.53, 0.91 and 0.16 N at the temperatures of 30, 40, 50, 60 and 77 K, respectively. The present results perform that a high-performance good-quality GdBCO can improve from laboratory conditions to technological applications for large scale levitated system.

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Section: Resultsmentioning

confidence: 58%

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Güner

2020

Sakarya University Journal of Science

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“…They suggested that the J c improvements resulted from higher density and grain connectivity. Zhang et al [24] and Guner et al [25] reported similar findings and concluded that excess Mg led to higher density and lower impurities content in the bulk improving inter-grain connectivity and J c values at low field.…”

Section: Introductionmentioning

confidence: 68%

“…Several research groups have investigated the effect of excess Mg in the case of MgB 2 bulks and wires produced by the in-situ process [21][22][23][24][25]. Zeng et al [21] and Ma et al [23] both produced MgB 2 bulk samples by using 10 wt.% of excess Mg and reported significant improvements in critical current density (approximately 2-3 fold increase at self field and 20 K) compared to their reference MgB 2 sample.…”

Section: Introductionmentioning

confidence: 99%

Improving the connectivity of MgB₂ bulk superconductors by a novel liquid phase sintering process

Matthews

Mousavi

Santra

et al. 2022

Supercond. Sci. Technol.

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This work investigates a new processing method developed to improve the connectivity of ex-situ MgB2 bulks at low sintering temperatures. Mg additions (1 − 10 wt.%) were mixed to pre-synthesised MgB2 to make composite powders that were sintered at 900 ﬃC by the Field Assisted Sintering Technique (FAST). Addition of 10 wt.% Mg resulted in a substantial increase in density from 68 to 79% and a dramatic reduction in MgB4from 11 to ∼ 0 wt.%. Pressure and dilatometry data recorded in-situ during the sintering process revealed that Mg additions led to diﬀerent sintering mechanisms depending on the Mg fraction. For large Mg fractions (6 and 10 wt.%) a Mg liquid phase was formed and led to signiﬁcant density improvements, and all pre-existing MgB4 was transformed into MgB2. A small amount of residual Mg remained in the bulks after the sintering process. Connectivity was improved with Mg additions, increasing 4 fold in the 10 wt.% Mg-MgB2 sample compared to unmodiﬁed MgB2. Jc values at low ﬁeld were also signiﬁcantly improved by Mg additions, in particular the 6 and 10 wt.% Mg-MgB2 specimens showed Jc(20 K, 0 T) values 4 − 5 times higher than for unmodiﬁed MgB2.

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“…We can also confirm the proof of unreacted Mg from XRD data. Furthermore, several studies confirm that the presence of unreacted Mg is the key factor to decrease the resistivity around TC and the value of RRR is increased [23][24][25][26]. The use of Stainless Steel tubes also makes a higher TC,zero value than the use of Fe and Ni tubes [27].…”

Section: Discussionmentioning

confidence: 99%

Study on the Sintering and Mg Composition Effect on MgB<sub>2</sub> Superconducting Bulks and Wires Synthesized by Powder-in-Sealed-Tube Method

Khan

Imaduddin

Nugraha

et al. 2021

AMR

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Numerous research efforts aimed at the MgB2 (Magnesium diboride) as a superconducting material due to its higher critical temperature than Nb-based superconductors such as NbTi, Nb3Sn. Nowadays MgB2 is becoming more popular as the candidate to be applied on medical devices and large-scale applications because of its full coherence lengths, improved critical current density and fields, and simple crystal structure. In this study, we fabricated the 4 mm MgB2 superconducting wires by mixing stoichiometric mole ratio of Mg: B with 1.0:2.0 and 1.1:2.0 through the Powder-In-Sealed-Tube (PIST) method to optimize high critical temperature (TC) than the conventional MgB2 bulk and wire. Furthermore, we decreased the diameter of 4 mm to 1.8 mm wire and analyze the effect of critical temperature. The specimens were sintered at a different temperature to investigate the sintering effect of MgB2 superconducting wire. The resistivity versus temperature relationship, surface morphology, and crystal phase was characterized using Cryogenic system, SEM (Scanning Electron Microscopy), and XRD (X-ray Diffractometer), respectively. We optimized the high Tc,onset for the bulk and 4 mm wire compared to other studies that are 42.1K and 40.3K respectively at 800°C sintered temperature. Finally, the results suggest that the stoichiometric ratio of MgB2 exhibited excellent feasibility to prepare conventional MgB2 superconducting wire.

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Investigation on superconducting and magnetic levitation force behaviour of excess Mg doped-bulk MgB2 superconductors

Cited by 17 publications

References 47 publications

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Improving the connectivity of MgB₂ bulk superconductors by a novel liquid phase sintering process

Study on the Sintering and Mg Composition Effect on MgB<sub>2</sub> Superconducting Bulks and Wires Synthesized by Powder-in-Sealed-Tube Method

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Investigation on superconducting and magnetic levitation force behaviour of excess Mg doped-bulk MgB2 superconductors

Cited by 17 publications

References 47 publications

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Improving the connectivity of MgB2 bulk superconductors by a novel liquid phase sintering process

Study on the Sintering and Mg Composition Effect on MgB<sub>2</sub> Superconducting Bulks and Wires Synthesized by Powder-in-Sealed-Tube Method

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Improving the connectivity of MgB₂ bulk superconductors by a novel liquid phase sintering process