Structural features, stacking faults, and grain boundaries in MgB2 superconducting materials
J. Q. Li, L. Li, Y. Q. Zhou, Z. A. Ren, G. C. Che, Z. X. Zhao
Abstract
The structural properties of MgB2 superconductors have been analyzed by means of convergent-beam electron diffraction, high-resolution transmission-electron microscopy, and theoretical simulations. The MgB2 crystal has been identified to have a hexagonal structure with the space group of P6/mmm. Microstructural features of MgB6 materials depend evidently upon the synthesis pressures. Stacking faults and grain boundaries in a sample with the critical current density greater than 105A/cm2 have been extensively investigated.
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