Synthesis of the B1-type tantalum nitride by shock compression

T. Mashimo, S. Tashiro, T. Toya, M. Nishida, H. Yamazaki, S. Yamaya, K. Oh-Ishi, Y. Syono

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Abstract

B1-type tantalum nitride (polycrystalline bulk state) was synthesized by shock compression. Shock-compression recovery experiments of the porous sample of tantalum nitride with a hexagonal structure (CoSn-type) were performed in the impact-velocity range up to 1.5kms-1. The instrumental chemical analysis, X-ray and electron diffraction experiments were carried out on the recovered tantalum nitride sample and the combustion-synthesized B1-type sample for comparison. The recovery rate of the B1 -type phase increased with increasing porosity, impact velocity and impactor thickness; among these above all the effect of porosity was most remarkable. Almost 100% recovery rate was achieved for the powder of 70% porosity impacted by a 2 mm thick tungsten plate with velocities above 1.4 kms-1. It was confirmed by chemical analysis that the nitrogen content did not change by shock compression. The chemical formulae of the shock-synthesized and combustioned-synthesized B1-type phases were estimated to be TaN0.96-0.99 and TaN1.13-1.16, 1.27-1.30, respectively. The lattice parameter of the shock-synthesized B1 -type (Fm3m) phase was ao=0.43363- + (1) nm. The results of X-ray and electron diffraction experiments also supported that the shock-synthesized B1-type tantalum nitride has a good stoichiometry compared with the combustion-synthesized ones.

Original languageEnglish
Pages (from-to)3439-3443
Number of pages5
JournalJournal of Materials Science
Volume28
Issue number13
DOIs
Publication statusPublished - Jul 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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