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Published in:
19-05-2016
Evaluation of quenching-induced lattice strain and superconducting properties in un-doped and glycine-doped MgB2 bulks
Published in: Journal of Materials Science: Materials in Electronics | Issue 9/2016
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Abstract
Bulk MgB2 samples with or without glycine doping were sintered at 800 °C followed by furnace cooling and quenching, respectively. The strain analysis and the microstructure observation revealed that the un-doped and glycine-doped MgB2 showed contrary response to the used quenching treatment, in terms of the crystallinity, the lattice parameters, and the superconducting properties. Accordingly, the critical current density of the quenched MgB2 is enhanced with respect to the furnace-cooled one, due to the pinning dislocations and the well-connected MgB2 net induced by the reserved strain. As for the glycine-doped samples, the impurity particles, which served as effective pinning centers in the furnace-cooled sample, segregated at the grain boundary under the driving force of the residual strain, and are destructive to the critical current density of the quenched one.