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United States of America Patent
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Jul 30, 2013
Grant Date -
Jun 21, 2012
app pub date -
Feb 22, 2008
filing date -
Feb 26, 2007
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Abstract
The object of the invention is the synthesis of threadlike tungsten oxide W5O14, in the presence of nickel at a temperature lower than 1000° C. Represented is a procedure for the synthesis of a highly homogeneous phase of the W5O14 compound from the vapor phase, in the presence of nickel, by means of a chemical transport method in a closed quartz ampoule. As an alternative example, a procedure is represented for the synthesis of the W5O14 compound in a through-flow reaction vessel. Both procedures yield electrically conductive threadlike crystals of the W5O14 compound. The synthesis is performed in vapor phase. Tungsten enters the reaction as a pure phase or via WS2±x, x≈4, previously synthesized from the elements, and/or the source of tungsten may also be tungsten oxides WO3−Y, 0≦y≦1. Nickel may enter the reaction via NiI2, Ni(OH)2 and/or atomic nickel.
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