4.7 Article

Synthesis of MAX Phases in the Hf-Al-C System

Journal

INORGANIC CHEMISTRY
Volume 55, Issue 21, Pages 10922-10927

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.6b01398

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Funding

  1. Agency for Innovation by Science and Technology (IWT), Flanders, Belgium [131081]
  2. European Atomic Energy Community's (Euratom) Seventh Framework Programme FP7 [604862]
  3. Hercules Foundation [ZW09-09]
  4. Knut and Alice Wallenberg Foundation

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For the first time, MAX phases in the Hf-Al-C system were experimentally synthesized using reactive hot pressing. HfC was observed as the main competing phase. The lattice parameters of Hf2AlC and Hf3AlC2 were determined by Rietveld refinement based on the X-ray diffraction data. The atomic stacking sequence was revealed by high-resolution scanning transmission electron microscopy. Mixtures of 211 and 312 stacking were observed within the same grain, including 523 layers. This transition in atomic structure is discussed.

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