X-ray absorption spectroscopic study of a hot pressed MgB2

C. H. Hsieh, C. H. Chang, C. N. Chang, U. C. Sou, H. S. Sheu, H. C. Hsu, H. C. Yang

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Abstract

X-ray near edge absorption spectra (XANES) of boron and oxygen K edge of a hot-pressed MgB2 (HP2) sample were measured by using synchrotron radiation. The HP2 was produced by annealing a commercial powder of MgB 2 in ambient air under a hydrostatic pressure of 2.0 GPa at 900°C. No substantial change of the electronic structure in HP2 was observed as indicated in the B K-edge XANES. This sample maintains high superconductivity and enhances the critical current density. The XANES and the XRD combined indicate that both MgO and B2O3 in HP2 increase and more B2O3 than MgO was produced during the hot-press process. The better connection of the grain in HP2 can be the major cause to increase its critical current density. However, the impurity may also increase the flux pinning and therefore increases the current density.

Original languageEnglish
Pages (from-to)97-100
Number of pages4
JournalSolid State Communications
Volume137
Issue number1-2
DOIs
Publication statusPublished - 2006 Jan 1

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Keywords

  • A. MgB
  • A. Superconductivity
  • D. Hot press
  • D. X-ray absorption

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Hsieh, C. H., Chang, C. H., Chang, C. N., Sou, U. C., Sheu, H. S., Hsu, H. C., & Yang, H. C. (2006). X-ray absorption spectroscopic study of a hot pressed MgB2. Solid State Communications, 137(1-2), 97-100. https://doi.org/10.1016/j.ssc.2005.09.038