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Keywords:

  • Microtubes;
  • Mullite

A novel single-crystalline microtubular structure of Al-rich mullite has been synthesized via a simple solid–vapor process. The microtubes have perfect rectangularly framed cross-sections (see Figure and cover) as defined by the ± (110) and ± (1equation image0) facets. The microtubes have a [001] growth axis, a dislocation-free volume, a large, completely hollow interior channel 0.5–3 μm in width, and thin walls of 50–100 nm.