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(Color online) XRD patterns of undoped and nano-C-doped tapes. The data were obtained after peeling off the Fe sheath. The peaks of Fe were contributed from the Fe sheath.
(Color online) Transport critical current densities of Fe-sheathed tapes with nano-C doping level from , which were heat treated at (Batch I), at in magnetic fields. The values of the 5% C-doped tape that was sintered at are also included.
(Color online) Transport properties at for Fe-sheathed undoped and nanosized C-doped tapes (Batch II).
(Color online) TEM micrographs showing the nanoparticle inclusions and dislocations of the C-doped samples. Some of the dislocations have been labeled using white arrows. The diffraction pattern of each sample is shown in the corner of the corresponding image. (a) Low-magnification micrograph for samples sintered at . (b) High-magnification micrograph for samples sintered at . (c) Image of nanoparticle showing lattice fringes. (d) The energy dispersive spectroscopy element analysis of grains.
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