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.
@article{arxiv.cond-mat/0105478,
title = {Nonstoichiometry, Defects and Transport Properties in MgB2},
author = {Y. Y. Xue and R. L. Meng and B. Lorenz and J. K. Meen and Y. Y. Sun and C. W. Chu},
journal= {arXiv preprint arXiv:cond-mat/0105478},
year = {2009}
}
Comments
9 pages, 10 figures, submitted to Phys. Rev. B (May 24, 2001)