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An air-passivated hafnium subhydride subcarbide nanopowder of the formula Hf3.47C1.00H2.40Li0.10O0.12 was prepared via a slurry sonochemical reaction of HfCl4 and LiH, followed by a 900 °C vacuum anneal. HRTEM of the nanopowder revealed crystallites of 10 nm average diameter that are agglomerated into larger porous structures.
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Epshteyn et al. (2009) studied this question.
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