Formation and alloying of nanostructured β-W powders

N. C. Angastiniotis, B. H. Kear, L. E. McCandlish, K. V. Ramanujachary, M. Greenblatt

Research output: Contribution to journalArticlepeer-review

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Abstract

We have been investigating the reductive decomposition of spray dried ammonium metatungstate (AMT). Reduction of the pyrolysed powder in flowing hydrogen at T ≥ 625° C creates α-W, with bcc structure. Reduction at T ≤ 575° C results in the formation of W3O, with A15 structure. In situ reduction experiments carried out in a controled atmosphere, high temperature X-ray powder diffractometer have shown that W3O transforms to β-W, in which most of the oxygen atoms are absent. Various experiments confirming the existence of WO1-x are described. Initial experiments on its alloying behavior with nitrogen are also discussed.

Original languageEnglish (US)
Pages (from-to)293-302
Number of pages10
JournalNanostructured Materials
Volume1
Issue number4
DOIs
StatePublished - 1992

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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