Abstract
It is found that there exist two different but related parameters that control the value of the residual resistivity ratio (RRR) in MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , namely, the stoichiometry of the starting powder and the synthesis parameters. The origin of the high RRR in the polycrystalline MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> samples has been attributed to the enhanced crystallinity of the samples due to higher Mg concentration in the starting composition. Scanning-electron-microscope images show the improved crystalline nature of the tape samples synthesized with the excess Mg in the starting powder mixture.
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