Influence of Mg particle size on the reactivity and superconducting properties of in situ MgB2

Vinod, K.; Varghese, Neson; Kumar, Rohit; Syamaprasad, U.; Roy, S. B.

doi:10.1016/j.jallcom.2007.10.030

Cited by 15 publications

(4 citation statements)

References 27 publications

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“…Very recently, Vinod et al also reported that reactivity of starting materials was depended on the size of the starting Mg powder. The MgB 2 prepared using smaller sized magnesium powder does not have any residual magnesium [23].…”

Section: Introductionmentioning

confidence: 97%

Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

Lee¹,

Shin²,

Kim³

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 97%

Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

Lee¹,

Shin²,

Kim³

et al. 2009

Journal of Alloys and Compounds

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“…Proses sintering yang diberikan pada kawat mengakibatkan Mg berubah fasa menjadi liquid dan menutupi Boron. Hal ini mengakibatkan terjadinya reduksi volume intrinsik dan meninggalkan ruang yang menyebabkan terjadinya porositas [7] .…”

Section: Hasil Dan Pembahasanunclassified

Pengaruh Doping Nikel dan Suhu Sinter pada Pembuatan Kawat Superkonduktor Magnesium Diborida

Herbirowo¹,

Hanafi

Imaduddin

et al. 2020

Indonesian J Appl Phys

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Peningkatan sifat superkonduktor MgB2 melalui penambahan doping telah banyak dilakukan. Meskipun begitu, pembuatan kawat superkonduktor MgB2 belum secara optimal dihasilkan akibat porositas yang terbentuk dari struktur lapis MgB2. Tujuan penelitian ini adalah untuk menganalisis efek penambahan doping nikel terhadap nilai kristalinitas dan kepadatan serta temperatur optimum dalam sintesis kawat superkonduktor berbasis MgB2. Variabel proses pada sampel yang digunakan yaitu variasi persen berat doping Nikel dan temperatur sintering. Karakterisasi yang digunakan meliputi Xray Diffraction (XRD), Scanning Electron Micoscope-Energy Dispersive Spectroscopy (SEM-EDS), dan Cryogenic Magnet. Pembuatannya menggunakan proses metalurgi serbuk dengan metode powder in tube secara in-situ dan manufaktur pengerolan kawat. Pengerolan dilakukan reduksi ukuran diameter 6 mm menjadi 4 mm, serta panjang awalnya 10 cm menjadi ±26 cm. Dari hasil XRD menunjukkan bahwa sampel dengan doping nikel menghasilkan fasa primer MgB2 dan fasa sekunder MgNi2.5B2 serta beberapa pengotor (MgO dan Mg) dengan ukuran kristalit lebih meningkat dibandingkan MgB2 tanpa doping. Dari gambar SEM, sampel tampak menunjukkan penurunan jumlah porositasnya. Sampel yang disinter 750°C merupakan temperatur optimal dalam mensintesis superkonduktor MgB2 yang didoping nikel karena memiliki Tc onset tertinggi sebesar 42,53 K dan porositas terendah pada pendopingan nikel sebesar 20 persen berat yaitu sebesar 13,5% porositas.

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“…The particle size and crystallinity of precursors (Mg and B powders) used in in-situ PIT MgB 2 wires are crucial factors that influence the magnetic field dependence of critical current density (J c (H)) [6][7][8][9][10][11]. Investigations into using various B powders to prepare MgB 2 wire have been a subject of interest in literature.…”

Section: Introductionmentioning

confidence: 99%

“…Xu et al [6] found that J ct of in-situ PIT MgB 2 wire fabricated with finer B powders exhibited a better performance, 4.0 × 10 3 A cm −2 at 4.2 K in 8 T. Kim et al [7] reported that J ct of wire made with amorphous B powder was 1.05 × 10 4 A cm −2 at 4.2 K in 8 T, which was higher than the wire made with crystalline B powder. However, there is a small amount of papers specifically focusing on the impact of different Mg powders on the performance of MgB 2 wires, primarily due to the commercial availability of only micronsized Mg powders [9][10][11]. Different particle sizes of micronsized Mg powders were used by Maeda et al [9] who found that the wire with the smallest Mg powder showed the largest J ct value, approximately 7.0 × 10 3 A cm −2 at 4.2 K in 10 T. For MgB 2 prepared using micron-sized Mg and amorphous B, Mg melts, diffuses and reacts with B, leaving a large hole in its original position [12].…”

Section: Introductionmentioning

confidence: 99%

Amorphous B coated Mg nanopowder induces low angle grain boundaries and enhances J _c of MgB₂ wire

Xi,

Cai,

Wang

et al. 2024

Supercond. Sci. Technol.

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In this work, amorphous B coated Mg nanopowder (BCMN) is synthesized and transport property of MgB2 superconducting wire is significantly enhanced with different contents of BCMN. BCMN has high reactivity since it contains nanoscale Mg and amorphous B. It allows to obtain MgB2 nanocrystals at only 400 °C with the compression of a lattice parameter and expansion of c lattice parameter compared to MgB2 formed by micron-sized Mg mixed with amorphous B (Mg + B) powders. These MgB2 nanocrystals serve as crystal nuclei and promote the crystallization and growth of MgB2. The mismatch of different lattice parameters prepared using BCMN and M + B powders induces low angle grain boundaries (LAGBs) embedded in MgB2 grains. LAGBs act as plane defects, leading to a dominant surface pinning mechanism and an enhancement in the critical current density on the magnetic field (J c(H)). At 4.2 K in 6 T, transport critical current density (J ct) of wire with 20 wt.% BCMN is 6.7 × 104 A·cm−2, approximately 1.8 times wire with 0 wt.% BCMN.

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Influence of Mg particle size on the reactivity and superconducting properties of in situ MgB2

Cited by 15 publications

References 27 publications

Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

Pengaruh Doping Nikel dan Suhu Sinter pada Pembuatan Kawat Superkonduktor Magnesium Diborida

Amorphous B coated Mg nanopowder induces low angle grain boundaries and enhances J _c of MgB₂ wire

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Influence of Mg particle size on the reactivity and superconducting properties of in situ MgB2

Cited by 15 publications

References 27 publications

Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

Pengaruh Doping Nikel dan Suhu Sinter pada Pembuatan Kawat Superkonduktor Magnesium Diborida

Amorphous B coated Mg nanopowder induces low angle grain boundaries and enhances J c of MgB2 wire

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Amorphous B coated Mg nanopowder induces low angle grain boundaries and enhances J _c of MgB₂ wire