TY - JOUR
T1 - Formation and alloying of nanostructured β-W powders
AU - Angastiniotis, N. C.
AU - Kear, B. H.
AU - McCandlish, L. E.
AU - Ramanujachary, K. V.
AU - Greenblatt, M.
N1 - Funding Information:
This work was suppofiedbythe Office of Naval Research undercon~act#N00014-91-J-1828.
PY - 1992
Y1 - 1992
N2 - 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.
AB - 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.
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U2 - 10.1016/0965-9773(92)90036-W
DO - 10.1016/0965-9773(92)90036-W
M3 - Article
AN - SCOPUS:0009118792
SN - 0965-9773
VL - 1
SP - 293
EP - 302
JO - Nanostructured Materials
JF - Nanostructured Materials
IS - 4
ER -