Influence of reactivity of sheath materials with Mg/B on superconducting properties of MgB2

Varghese, Neson; Vinod, K.; Kumar, Rohit; Syamaprasad, U.; Sundaresan, A.

doi:10.1063/1.2773696

Cited by 21 publications

(11 citation statements)

References 24 publications

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“…Usually, boron-rich magnesium alloys have excellent material characteristics such as mechanical properties and stability 4 , 5 . Moreover, MgB 2 has been widely introduced into magnesium alloys for the reinforcement and grain refinement 6 , 7 , because of the chemical substitution and the crystal growth of substituted MgB 2 8 – 11 . Therefore, increasing attention has been paid to investigate the magnesium boride alloys in many academic fields.…”

Section: Introductionmentioning

confidence: 99%

Pressure effect of the mechanical, electronics and thermodynamic properties of Mg–B compounds A first-principles investigations

Zhang

Wang

et al. 2021

Sci Rep

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First principle calculations were performed to investigate the structural, mechanical, electronic properties, and thermodynamic properties of three binary Mg–B compounds under pressure, by using the first principle method. The results implied that the structural parameters and the mechanical properties of the Mg–B compounds without pressure are well matched with the obtainable theoretically simulated values and experimental data. The obtained pressure–volume and energy–volume revealed that the three Mg–B compounds were mechanically stable, and the volume variation decreases with an increase in the boron content. The shear and volume deformation resistance indicated that the elastic constant Cij and bulk modulus B increased when the pressure increased up to 40 GPa, and that MgB7 had the strongest capacity to resist shear and volume deformation at zero pressure, which indicated the highest hardness. Meanwhile, MgB4 exhibited a ductility transformation behaviour at 30 GPa, and MgB2 and MgB7 displayed a brittle nature under all the considered pressure conditions. The anisotropy of the three Mg–B compounds under pressure were arranged as follows: MgB4 > MgB2 > MgB7. Moreover, the total density of states varied slightly and decreased with an increase in the pressure. The Debye temperature ΘD of the Mg–B compounds gradually increased with an increase in the pressure and the boron content. The temperature and pressure dependence of the heat capacity and the thermal expansion coefficient α were both obtained on the basis of Debye model under increased pressure from 0 to 40 GPa and increased temperatures. This paper brings a convenient understanding of the magnesium–boron alloys.

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Section: Introductionmentioning

confidence: 99%

Pressure effect of the mechanical, electronics and thermodynamic properties of Mg–B compounds A first-principles investigations

Zhang

Wang

et al. 2021

Sci Rep

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“…For large scale electric power applications, superconducting MgB 2 tapes or wires are required to be produced in long lengths to replace conventional superconductors [1]. The fabrication of sheath-typed tapes by the powder-in-tube (PIT) method with a high critical current density (J c ) under high magnetic field has been actively studied [2][3][4][5][6][7]. The film growth of MgB 2 superconductors has been achieved using molecular beam epitaxy (MBE) [8][9][10], pulsed laser deposition 6 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of superconducting MgB₂thin films on textured Cu(100) tape by hybrid physical–chemical vapor deposition

Lee

Ranot

Seong

et al. 2009

Supercond. Sci. Technol.

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We report on the fabrication of superconducting MgB 2 thin films on textured Cu(100) tape under low pressure and temperature by using a hybrid physical-chemical vapor deposition (HPCVD) technique to explore the possible broad range of deposition. Thermodynamic calculations for the Mg-B system have been carried out and the pressure-temperature phase diagram was obtained. Our results demonstrate that the deposition of superconducting MgB 2 films is possible beyond the theoretically calculated growth window, where the sublimation of Mg is taking place. The structural and microstructural investigations reveal that MgB 2 films are c-axis-oriented normal to the substrate. The highest J c of ∼1.34 × 10 5 A cm −2 at 5 K under 3 T is obtained for the film grown at 460 • C. The critical current density (J c ) and flux pinning force density (F p ) of MgB 2 films are enhanced with decreasing growth temperature. This could be attributed to the high density of grain boundaries which may act as effective flux pinning centers. These findings suggest an alternative route to fabricate MgB 2 tapes at low temperature for large scale applications.

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“…Penelitian ini menggunakan metode powder in tube in-situ dimana serbuk MgB2 dimasukkan ke dalam selubung baja sebagai media pembentukan kawat sebelum proses sintering. Metode powder in tube in-situ dipilih berdasarkan faktor efisien dan lebih ekonomis dengan hasil yang menunjukkan sifat superkonduktivitas dan sifat mekanik yang baik [10].Pada penelitian ini fabrikasi lanjut pada material MgB2 dilakukan menggunakan tabung baja tahan karat sebagai bahan selubung yang lebih optimal karena tidak bereaksi ketika dipanaskan dan menghasilkan fasa MgB2 yang lebih baik serta memiliki keunggulan lain yaitu biaya yang murah dan kemampuan deformasi yang baik serta dapat dilakukan perlakuan panas [11]- [12]. Proses pembentukan kawat selanjutnya dilakukan dengan proses rolling merupakan proses deformasi plastis yang merupakan metode pembentukan sederhana yang dapat meningkatkan sifat mekanik material namun menurunkan keuletan [13].…”

Section: Pendahuluanunclassified

Fabrikasi Kawat Resistansi Nol Berbahan MgB2/Stainless Steel dengan Variasi Reduksi Ukuran melalui Pengerolan Dingin terhadap Karakteristik Mekanik dan Struktur Mikro

Herbirowo¹,

Pramono²

2021

energi

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Magnesium Diboride (MgB2) is a high potential material for medical and electrical applications with zero resistance and high efficiency. The raw materials of Mg powder with a purity of 98% and B amorphous with a purity of 95%, were mixed with a ratio of 1:2, ground for 2 hours using an agate mortar, and subsequently compacted and inserted into stainelss steel (SS) tube by powder-in-tube (PIT). The SS tube was previously annealed at 900°C for 1 hour. The sintering process was carried out using a muffle furnace at a temperature of 800°C for 1 hour, followed by cold wire rolling with gradual reduction. The samples were characterized for their mechanical properties using Vickers microhardness tester and ultimate tensile test machine. Surface morphologies of samples were observed using optical microscope and SEM-EDAX Superconducting properties were measured with the cryogenic resistance measurement. The highest hardness value of 377,2 HV was achieved at a 60% size reduction along with the tensile strength of 1381 KN/mm. The results of the morphological observation showed homogeneous deformation without any cracks, with the the grain shape tended to be crystalline. The superconductivity test showed the phenomenon of zero resistance at a critical temperature of 39.55K at a 40% reduction in MgB2 wire

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Influence of reactivity of sheath materials with Mg/B on superconducting properties of MgB2

Cited by 21 publications

References 24 publications

Pressure effect of the mechanical, electronics and thermodynamic properties of Mg–B compounds A first-principles investigations

Pressure effect of the mechanical, electronics and thermodynamic properties of Mg–B compounds A first-principles investigations

Fabrication of superconducting MgB₂thin films on textured Cu(100) tape by hybrid physical–chemical vapor deposition

Fabrikasi Kawat Resistansi Nol Berbahan MgB2/Stainless Steel dengan Variasi Reduksi Ukuran melalui Pengerolan Dingin terhadap Karakteristik Mekanik dan Struktur Mikro

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Influence of reactivity of sheath materials with Mg/B on superconducting properties of MgB2

Cited by 21 publications

References 24 publications

Pressure effect of the mechanical, electronics and thermodynamic properties of Mg–B compounds A first-principles investigations

Pressure effect of the mechanical, electronics and thermodynamic properties of Mg–B compounds A first-principles investigations

Fabrication of superconducting MgB2thin films on textured Cu(100) tape by hybrid physical–chemical vapor deposition

Fabrikasi Kawat Resistansi Nol Berbahan MgB2/Stainless Steel dengan Variasi Reduksi Ukuran melalui Pengerolan Dingin terhadap Karakteristik Mekanik dan Struktur Mikro

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Fabrication of superconducting MgB₂thin films on textured Cu(100) tape by hybrid physical–chemical vapor deposition