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Preparation of tungsten oxide

United States Patent

September 22, 2009
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Tungsten trioxide hydrate (WO.sub.3.H.sub.2O) was prepared from a precursor solution of ammonium paratungstate in concentrated aqueous hydrochloric acid. The precursor solution was rapidly added to water, resulting in the crash precipitation of a yellow white powder identified as WO.sub.3.H.sub.2O nanosized platelets by x-ray diffraction and scanning electron microscopy. Annealing of the powder at C. provided cubic phase WO.sub.3 nanopowder, and at C. provided WO.sub.3 nanopowder as a mixture of monoclinic and orthorhombic phases.
Bulian; Christopher J. (Yankton, SD), Dye; Robert C. (Los Alamos, NM), Son; Steven F. (Los Alamos, NM), Jorgensen; Betty S. (Jemez Springs, NM), Perry; W. Lee (Jemez Springs, NM)
Los Alamos National Security, LLC (Los Alamos, NM)
10/ 629,489
July 28, 2003
STATEMENT REGARDING FEDERAL RIGHTS This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy. The government has certain rights in the invention.