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The mechanically activated synthesis of hafnium diboride HfB2 from partially hydrated hafnium tetrachloride “HfCl4” is first described. Monocrystalline rods with submicron to micron lengths and a diameter of about 100 nm are synthesized by annealing, at 1373 K, of powder mixtures of “HfCl4” and boron ground with steel tools. The monocrystalline rods grow parallel to the c-axis of the HfB2 structure...
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