The observation that nanocrystalline Hf 3 N 4 is isostructural with the phase obtained by laser annealing at 12 GPa is highly significant as it suggests that at this moderate pressure with a short period of high-temperature annealing, the structure has not changed.
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Synthesis of tetragonal and orthorhombic polymorphs of Hf3N4 by high-pressure annealing of a prestructured nanocrystalline precursor.
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