Procedure for the synthesis of threadlike tungsten oxide W5O14

US8496907B2 · kind B2 · utility

Assignee

• Institut Jozef Stefan · SI

Inventors

• Maja Remskar · Grosuplje, SI
• Marko Virsek · Grosuplje, SI
• Miha Kocmur · Ljubljana, SI
• Adolf Jesih · Radovljica, SI

Key dates

• Filing date: Feb 22, 2008
• Grant date: Jul 30, 2013
• Expiry date: Oct 30, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.