Advanced Materials

Aligned Nanocrystalline Fragmentation of Mullite under Shock Loading


  • The authors thank M. Hasegawa for assistance in constructing the experimental setup. This work was supported by the Grant-in-Aid for Scientific Research (B) no. 19360381 and by the Collaborative Research Project of Materials and Structures Laboratory, Tokyo Institute of Technology. A part of this work was carried out under the Visiting Researcher's Program of the Laboratory for Advanced Materials, Institute for Materials Research, Tohoku University.


Aligned nanocrystalline fragments in an amorphous phase, formed by shock-loading of mullite, are revealed by transmission electron microscopy and X-ray diffraction studies. The novel structure (see figure) is explained by amorphization due to oxygen vacancies in the mullite structure at pressures above the phase-transition pressure.

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