Crystal structure refinements of Al-bearing phase D by single-crystal synchrotron X-ray diffraction method

Abstract

Single-Crystal synchrotron X-ray diffraction study on Al-bearing phase D was conducted to refine its crystal structure.  The axial length of a-axis of our sample is larger than those of the other MgSi-phase D, and that of c-axis is smaller. Moreover, Comparing with Mg-free Al-phase D (Pamato et al., 2015), the trend of axial length with increasing Al content is apparently different. This shows that the Al replacement in phase D structure should affect its structural transformation with its chemical composition change.