The atomic structure of a symmetric 24°[001] tilt grain boundary in MgO has been derived directly from high-resolution Z-contrast images obtained in a scanning transmission electron microscope. The images indicate the presence of impurities (Z>12) and vacancies at the boundary. High spatial resolution electron energy-loss spectroscopy has been used to determine that the segregated impurity is Ca. The specific sites occupied by Ca are obtained from the image and bond valence sum analysis.
No takes yet. Share an insight, caveat, or question.
Yan et al. (1998) studied this question.