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Bulk materials of MgB 2 have been prepared with the stoichiometry of MgB 2 (Al 2 O 3 )x, x=0, 6%, 10%, 15%, 20% nano-alumina added, respectively, by using solid-state reaction route. Phase analysis shows that for a higher level of addition, a larger amount of Al is doped into the lattice of MgB 2 and there are more Al 2 O 3 particles present...
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