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arxiv: cond-mat/0105478 · v1 · submitted 2001-05-24 · ❄️ cond-mat.supr-con

Nonstoichiometry, Defects and Transport Properties in MgB2

Y. Y. Xue (1) , R. L. Meng (1) , B. Lorenz (1) , J. K. Meen (1) , Y. Y. Sun (1) , C. W. Chu (1 , 2) ((1) TCSUH , University of Houston
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Houston Texas (2) LBNL Berkeley California)
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keywords mgb2defectstransportaffectedannealingceramicchangedcomposition
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The local composition Mg:B of MgB2 powder was systematically changed through annealing. Correlations were observed between the Mg loss and the lattice parameters a/c and the microstrain of MgB2. Direct wavelength-dispersive-spectrum and XRD measurements on ceramic samples with different residual resistivity ratios suggested that the transport property of MgB2 might be affected by this Mg-deficiency, but oxygen-related defects may play a more important role.

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