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Chapitre D'ouvrage Année : 2015

Electric and Magnetic Characterization of Bulk Ag-added MgB2

Résumé

In earlier studies it was found that bulk, sintered MgB2 samples contained numerous voids which hinder the current flow. Therefore, a series of bulk MgB2 superconductors with Ag contents of 0 – 10 wt% was prepared in order to improve the critical current densities and the mechanical performance. Several samples were fabricated using a solid state reaction in pure Ar atmosphere at the optimal reaction temperature of 775 °C. Thorough microstructural observations obtained from scanning electron microscopy (SEM) and atomic force microscopy (AFM) indicate that metallic Ag particles are embedded in the void regions. Furthermore, nanometer-sized AgMg3 particles are also present within the MgB2 matrix, leading to improved flux pinning. Small samples cut from the bulk were characterized by electric transport measurements [R(T,B) and I/V characteristics] in magnetic fields up to 8 T and by magnetization loops measured using a SQUID magnetometer.
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Dates et versions

hal-01197441 , version 1 (11-09-2015)

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  • HAL Id : hal-01197441 , version 1

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Alex Wiederhold, Michael Rudolf Koblischka, Kazuo Inoue, Muralidhar Miryala, Kévin Berger, et al.. Electric and Magnetic Characterization of Bulk Ag-added MgB2. Muralidhar Miryala (Shibaura Institute of Technology, Toyosu, Koto-ku, Tokyo, Japan). Superconductivity: Applications Today and Tomorrow, Nova Science Publishers, Chapter 12, pp. 269-277, 2015, Chemistry Research and Applications, 978-1-63483-816-0. ⟨hal-01197441⟩
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