Aniline doping and high energy milling to greatly enhance electromagnetic properties of magnesium diboride superconductors

Wang, Chengduo; Wang, Dongliang; Zhang, Xianping; Yao, Chao; Wang, Chunlei; Ma, Yanwei

doi:10.1016/j.physc.2013.04.010

Cited by 8 publications

(1 citation statement)

References 26 publications

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“…In contrast, for f(b) > 1, the addition of methylene blue trihydrate results in a shift towards the surface pinning behavior, which however becomes less pronounced as the temperature decreases, so that at 15 K all samples behave in a similar way again. An upwards shift of the f(b) curves at b > 1 has already been observed several times in relation to carbon doping in MgB2 [19,34,[43][44][45][46]. The fact that this effect tends to be cancelled at low temperatures was not mentioned earlier.…”

Section: Resultsmentioning

confidence: 78%

Increase of the critical current density of MgB2 superconducting bulk samples by means of methylene blue dye additions

Grivel

Rubešová

2019

Physica C: Superconductivity and its Applications

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MgB2 bulk samples were made by means of reaction of elemental Mg and B powders with or without additions of methylene blue trihydrate, a carbon source, which melts at high temperature upon decomposition. The Tc of the MgB2 phase as well as its a-axis parameter were decreased as a result of carbon doping, whereas the c-axis parameter only shows a weak tendency for increasing.The critical current density of MgB2 was improved both in self field and under applied magnetic field for T ≤ 25 K, the best results being obtained for 0.5 -1.0 wt.% methylene blue trihydrate addition.Based on normalized flux pinning force (f(b)) versus reduced field (b) plots, it was found that the flux pinning mechanism at low reduced field is similar for all samples, with a behavior close to the predictions of the point pinning model. However, for b larger than 1, the behavior of f(b) is significantly altered in the methylene blue trihydrate added samples and tends towards the surface pinning model. Methylene blue trihydrate is an efficient carbon source and furthermore provides a liquid phase between 200°C and 450°C, which may have some influence on the critical current density improvements at low field.

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