Abstract
Using minimum exposure techniques, it is feasible to perform high resolution electron microscopy on the α-cristobalite phase of (Si0.9 Ge0.1)O2, which is extremely radiation sensitive. Such images reveal atomic scale information of twins and tridymite-like stacking faults on (1 1 1)β planes, as well as of domain boundaries resulting from the β→α transition. Polytype structures are formed in certain cases. Morphological features suggest that the phase transformation cristobalite → tridymite proceeds by means of a zonal dislocation mediated synchro-shear process on (1 1 1)β planes; the geometry of this process is analyzed.
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Received: 13 June 1999 / Accepted: 30 October 1999
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Lemmens, H., Czank, M., Van Tendeloo, G. et al. Defect structure of the low temperature α-cristobalite phase and the cristobalite ⇆ tridymite transformation in (Si-Ge)O2 . Phys Chem Min 27, 386–397 (2000). https://doi.org/10.1007/s002699900082
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DOI: https://doi.org/10.1007/s002699900082