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Figure 1
Structural elements of mullite and site labels. Subsequent layers are shown with decreased opacity. Chains of AlO6 octahedra (dark blue) are interlinked by diclusters consisting of two T sites and triclusters consisting of two T sites and a T* site. Two triclusters always embrace the void of an oxygen vacancy like the one between the two labelled T* sites. Octahedrally coordinated Al1 atoms are bonded to four O1 atoms and two O2 atoms. The bridging oxygens of diclusters and triclusters are labelled O3 and O4, respectively. Cations on the T site are labelled Al2 or Si2, and on the T* site Al3 or Si3. The unit-cell borders of the mullite average structure are marked by black lines.

Journal logoFOUNDATIONS
ADVANCES
ISSN: 2053-2733
Volume 75| Part 2| March 2019| Pages 260-272
https://doi.org/10.1107/S2053273319000846
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