Effects of High Pressure on the Physical Properties of MgB2

Prikhna, T. A.; Gawalek, W.; Savchuk, Ya. M.; Солдатов, А. В.; Eisterer, M.; Weber, H.W.; Noudem, Jacques; Serga, M.; Turkevich, V. Z.; Tompsic, M.; Ткач, В. М.; Danilenko, N. I.; Goldacker, W.; Karau, F.; Fesenko, I. P.; Rindfleisch, M.; Dellith, Jan; Wendt, Michael; You, Shujie; Meerovich, V.; Дуб, С. Н.; Moshchil, Viktor; Sergienko, Nina; Kozyrev, Artem; Habisreuther, T.; Schmidt, Ch.; Litzkendorf, D.; Nagorny, Peter; Sverdun, V. B.

doi:10.1007/s10948-010-0909-3

Cited by 10 publications

(22 citation statements)

References 13 publications

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“…added. The technology was described in details in [13]. The rings with outer diameter of 24.3 mm, height of 7 mm (ring 1) and 7.7 mm (ring 2) and wall thickness of 3.2 mm were cut out from high-pressure synthesized blocks.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The boron was mixed and milled with Mg chips in a high speed planetary activator and then 200-800 nm SiC granules were added. The technology was described in detail in [16]. Rings with an outer diameter of 24.3 mm, heights of 7 mm (ring 1, figure 1(b)) and 7.7 mm (ring 2) and a wall thickness of 3.2 mm were cut out of high pressure synthesized blocks.…”

Section: Experimental Samplesmentioning

confidence: 99%

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AC losses in high pressure synthesized MgB₂bulk rings measured by a transformer method

Meerovich¹,

Prikhna²,

Gawalek³

et al. 2013

Supercond. Sci. Technol.

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The recently developed manufacturing technologies use high pressure and various doping additions to prepare bulk MgB 2 -based materials with a high critical current density measured by the magnetization methods. We use a contactless transformer method, which is based on studying the superconductor response to an induced transport current, to measure AC losses in bulk MgB 2 rings synthesized under high pressure. The obtained dependence of the losses on the primary current (applied magnetic field) is fitted by the power law with the exponent ~2.1 instead of the cubic dependence predicted by Bean's model and power-law electric field-current density (E-J) characteristics with a large exponent. The unusually strong dependence of AC losses on the frequency was also observed. It was shown that the E-J characteristic of bulk MgB 2 is well fitted by the dependence used in the extended critical state model based on account of the viscous vortex motion in the flux flow regime. Numerical simulation using this E-J characteristic gives the current and frequency AC loss dependences which well agree with the experimental results.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Samplesmentioning

confidence: 99%

AC losses in high pressure synthesized MgB₂bulk rings measured by a transformer method

Meerovich¹,

Prikhna²,

Gawalek³

et al. 2013

Supercond. Sci. Technol.

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“…The superconducting characteristics of MgB 2 materials depend on many factors and their combination. Very deep and comprehensive studies of the synthesis process of MgB 2 -based materials, the correlation between material structure and superconducting characteristics, and the manufacturing technology have been performed by the authors of [ 7 , 8 , 9 , 10 , 11 , 16 , 19 , 73 , 76 , 82 , 84 , 85 , 98 , 99 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 ]. These correlations were comprehensively studied for materials prepared using initial powders of MgB 2 and stoichiometric Mg:2B mixtures (typical characteristics are given in Table 1 ) at manufacturing temperatures in the range of 600–1100 °C under different pressure conditions using the methods noted above.…”

Section: Effect Of Manufacturing Pressure–temperature–time Conditions...mentioning

confidence: 99%

“…For example, at 20 K, the sample 1 HP possessed the highest critical current density in relatively low fields, <5 T, it was 4 HP—in a higher field, >5.5 T ( Figure 1 a). The typical characteristics of MgB 2 -based samples prepared without additions from Mg:2B and MgB 2 under different conditions were summarized from [ 98 , 103 , 108 , 119 ] and are presented in Table 2 .…”

Section: Effect Of Manufacturing Pressure–temperature–time Conditions...mentioning

confidence: 99%

Bulk MgB2 Superconducting Materials: Technology, Properties, and Applications

Prikhna,

Sokolovsky,

Moshchil

2024

Materials

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The intensive development of hydrogen technologies has made very promising applications of one of the cheapest and easily produced bulk MgB2-based superconductors. These materials are capable of operating effectively at liquid hydrogen temperatures (around 20 K) and are used as elements in various devices, such as magnets, magnetic bearings, fault current limiters, electrical motors, and generators. These applications require mechanically and chemically stable materials with high superconducting characteristics. This review considers the results of superconducting and structural property studies of MgB2-based bulk materials prepared under different pressure–temperature conditions using different promising methods: hot pressing (30 MPa), spark plasma sintering (16–96 MPa), and high quasi-hydrostatic pressures (2 GPa). Much attention has been paid to the study of the correlation between the manufacturing pressure–temperature conditions and superconducting characteristics. The influence of the amount and distribution of oxygen impurity and an excess of boron on superconducting characteristics is analyzed. The dependence of superconducting characteristics on the various additions and changes in material structure caused by these additions are discussed. It is shown that different production conditions and additions improve the superconducting MgB2 bulk properties for various ranges of temperature and magnetic fields, and the optimal technology may be selected according to the application requirements. We briefly discuss the possible applications of MgB2 superconductors in devices, such as fault current limiters and electric machines.

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“…Numerous approaches have been taken to produce MgB 2 materials with high transport properties: (1) chemical doping of MgB 2 wires [ 3 – 5 ]; (2) cold pressing [ 6 – 7 ]; (3) hot isostatic pressing (HIP) [ 8 – 9 ]; (4) the introduction of the internal magnesium diffusion (IMD) method to address porosity and connectivity issues [ 10 – 12 ]. So far, the best “non-barrier” transport J c values were obtained by the advanced internal magnesium infiltration (AIMI) approach, with the addition of C and Dy 2 O 3 (1.07 × 10 5 A/cm 2 ) at 10 T, 4.2 K, [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Increased flux pinning force and critical current density in MgB₂ by nano-La₂O₃ doping

Zhang

Wan

Sumption

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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MgB 2 superconducting wires and bulks with nano-La 2 O 3 addition have been studied. A series of MgB 2 superconducting bulk samples with nano-La 2 O 3 addition levels of 0, 5, 7, 18wt% were prepared. AC resistivity data showed slight increases of Bc 2 and unchanged B irr for the bulk samples with doping levels lower than 7 wt% and decreased critical fields for the heavily doped (18 wt%) bulk. X-ray diffraction (XRD) showed the presence of LaB 6 in the nano-La 2 O 3 doped MgB 2 bulk samples and decreased MgB 2 grain size in nano-La 2 O 3 doped bulks. Monocore powder-in-tube (PIT) MgB 2 wires without and with 5 wt% nano-La 2 O 3 addition (P-05) were prepared for transport property measurement. 2mol%C-doped Specialty Materials Inc. (SMI) boron powder was used for wire P-05 and previously prepared control wires (control wires were made without the addition of nano-La 2 O 3 powder, W-00 and P2). Low field magnetic properties were obtained from magnetization loop (M–H), transport critical current density ( J c ) was measured at 4.2 K for the nano-La 2 O 3 doped PIT wire (P-05) and the control samples (P2 and W-00). The transport critical current density J c (B) of P-05 at 4.2 K and 8 T (6.0 ×10 4 A/cm 2 ) was twice that of the control wire. The critical magnetic fields ( Bc 2 and B irr ) of P-05 and the control sample P2 were compared. The critical fields of P-05 were slightly less than those of P2. Kramer-Dew-Hughes plots indicated a change from surface pinning to a mixture of volume pinning and surface pinning. It is shown that enhancement of P-05’s transport properties is due to additional flux pinning by the fine-size rare-earth borides rather than enhanced Bc 2 or B irr .

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Effects of High Pressure on the Physical Properties of MgB2

Cited by 10 publications

References 13 publications

AC losses in high pressure synthesized MgB₂bulk rings measured by a transformer method

AC losses in high pressure synthesized MgB₂bulk rings measured by a transformer method

Bulk MgB2 Superconducting Materials: Technology, Properties, and Applications

Increased flux pinning force and critical current density in MgB₂ by nano-La₂O₃ doping

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Effects of High Pressure on the Physical Properties of MgB2

Cited by 10 publications

References 13 publications

AC losses in high pressure synthesized MgB2bulk rings measured by a transformer method

AC losses in high pressure synthesized MgB2bulk rings measured by a transformer method

Bulk MgB2 Superconducting Materials: Technology, Properties, and Applications

Increased flux pinning force and critical current density in MgB2 by nano-La2O3 doping

Contact Info

Product

Resources

About

AC losses in high pressure synthesized MgB₂bulk rings measured by a transformer method

AC losses in high pressure synthesized MgB₂bulk rings measured by a transformer method

Increased flux pinning force and critical current density in MgB₂ by nano-La₂O₃ doping