Preparation and characterization of Sc doped MgB 2 wires

Preparation and characterisation of Os doped MgB 2

“…1) are probably due to smaller grains dispersed in the sample. The solubility limit of Os in the MgB 2 lattice is similar to that of Ru, but the rate of T c reduction is higher for Os than Ru doping (2.1 K/at.% versus 1.0 K/at.%) [32]. An additional contribution to T c depression in Os-doped MgB 2 might originate in the lattice contraction, which was found to be only marginal in the case of Ru doping.…”

“…Among the transition metal elements, only few results have been published on the possibility of substituting platinum group metal elements in MgB 2 . Besides Pt, which was studied in association with SiC doping [34], only Ir and Ru appear to have been reported to have a limited but measurable solubility and result in a decrease of T c [28,32]. The present contribution reports on the possible substitution of Os for Mg in MgB 2 and its effects on structure and T c .…”

“…For this reason, research activities are ongoing to find other potential options for enhancing the flux pinning strength of MgB 2 like for example dual doping on both B and Mg sites. Except for the case of Al that can be substituted for Mg up to at least 40% [12][13][14][15], doping on the Mg sites is usually limited to few atomic percent or even less [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Among the transition metal elements, only few results have been published on the possibility of substituting platinum group metal elements in MgB 2 .…”

Critical current density improvements in MgB 2 superconducting bulk samples by K 2 CO 3 additions

“…additions, while several publications dealing with carbon doping show an upwards deviation of f(b) upon doping without necessarily relating this effect to a specific pinning mechanism [16,23,34].…”

Influence of iridium doping in MgB2 superconducting wires

“…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].…”