Preparation and characterization of MgB2 with Pd, Pt and Re doping

Grivel, Jean‐Claude; Pitillas, A.; Namazkar, Shahla; Alexiou, Aikaterini; Holte, Olfert Joakim

doi:10.1016/j.physc.2015.11.001

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…Platinum group metals present various behaviours. Pd and Pt are virtually not soluble in MgB 2 [41], whereas about 1 at.% Ru and Os can be substituted for Mg [34,35]. Rh has a slightly higher solubility limit of 2.2 -2.5 at.% [40].…”

Section: Introductionmentioning

confidence: 98%

“…Beside boron site doping, numerous attempts have been made at doping various elements on the Mg sites. Unfortunately, while Al can replace up to 40 at.% Mg [18][19][20][21], for other elements solubility is limited to a few percent in most cases [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] and is often below detection limit [41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

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Influence of iridium doping in MgB2 superconducting wires

Grivel

2018

Physica C: Superconductivity and its Applications

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Document Version Peer reviewed versionLink back to DTU Orbit Citation (APA): Grivel, J-C. (2018). Influence of iridium doping in MgB2 superconducting wires. Physica C: Superconductivity and its Applications, 547, 7-15. https://doi. Highlights MgB 2 wires doped with Ir (iridium) were prepared and reacted in Ar.  The solubility limit of Ir in the MgB 2 lattice is not larger than 1.5 at.% relative to Mg.  The critical current density is degraded in the Ir-doped samples. AbstractMgB 2 wires with iridium doping were manufactured using the in-situ technique in a composite Cu-Nb sheath. Reaction was performed at 700°C, 800°C or 900°C for 1h in argon atmosphere. A maximum of about 1.5 at.% Ir replaces Mg in MgB 2. The superconducting transition temperature is slightly lowered by Ir doping. The formation of IrMg 3 and IrMg 4 secondary phase particles is evidenced, especially for a nominal stoichiometry with 2.0 at.% Ir doping. The critical current density and accommodation field of the wires are strongly dependent on the Ir content and are generally weakened in the presence of Ir, although the effect is less pronounced at lower temperatures.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Influence of iridium doping in MgB2 superconducting wires

Grivel

2018

Physica C: Superconductivity and its Applications

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“…Several methods have been used to synthesize MgB 2 superconductors, such as direct microwave synthesis [10], highenergy ball milling [11], infiltration, and growth process [12]. Chemical modification such as doping is still the most attractive and effective way to improve the properties of magnesium diboride [13,14]. CNT dopants [15] discovered that the connectivity of undoped exsitu MgB 2 often decreases.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of MgB2 superconductors with carbon nanotubes (CNTs) and tin (Sn) addition

et al. 2022

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MgB2/CNT is a promising candidate for superconducting wire application due to its excellent mechanical properties and carbon nanotube’s low density. However, strong interfacial adhesion between the CNT reinforcement and the MgB2 matrix is difficult to manage. Therefore, this study examines the synthesis and characterization of magnesium diboride (MgB2) superconductors with carbon nanotubes (CNTs) and tin (Sn) addition. Determining the proper method and combination of CNT & Sn affects MgB2 superconductors is crucial. Raw materials of magnesium (Mg), boron (B), Sn, and multi-walled carbon nanotubes (MWCNTs) were used for a solid-state reaction process to determine the proper synthesis method and the effect of CNT on superconductors’ critical temperature. Each sample was obtained by weighing the raw material first, followed by hand grinding with agate mortars for 3 hours. The pelletization was then conducted by using a compact pressing machine with a pressure of 350 MPa. The compacted samples were then sintered at 800 °C for 2 hours either through the vacuum or PIST process. Finally, all were characterized, and MgB2 was discovered to be the dominant phase with minor impurity phases such as MgO, Mg, Mg2Sn, C, and Sn. Based on SEM morphological analysis, the grain boundaries of sample A1 were more precise than B2. In both, the grain size also varies, and the distribution of elements is uneven. Subsequently, Cryogenic Magnet Characterization indicated that at 40 K, almost all samples possess superconducting characteristics. For future studies, the potential impact of MgB2 on critical current density (Jc) and magnetic density (Hc) in several commercial applications such as Magnetic Resonance Imaging (MRI), magnetic levitation, and transformers needs to be investigated

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