Shock compression synthesis of B1-type tantalum nitride

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Abstract
Shock compression was used to synthesize tantalum nitride with the B1-type (cubic) crystal structure. Hexagonal phase (Co-Sn Structure) tantalum nitride powder was packed with densities of ∼35% and ∼60% T.M.D into steel capsules, and shock loaded at 1.0 km/s impact velocity, corresponding to a 40-60 GPa calculated peak pressure. X-ray diffraction and optical and scanning electron microscopy were used to characterize the recovered compacts and starting powder. The highest yield of B1 phase was obtained from the capsule with the lower packing density in regions toward the non-impact face which correspond to the highest pressure and temperature. The lattice parameter of the shock synthesized B1 phase was determined to be 0.433 nm which coincides with a stoichiometry of approximately TaN 0.96 .

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