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'High pressure Reactions' in keywords Facet   Publication Year 1988  [X]
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1Author    Klaus-Jürgen Range, Reinhard Zintl, AntonM. HeynsRequires cookie*
 Title    The Thermal Decomposition of Ammonium Metavanadate(V) in Open and Closed Systems  
 Abstract    The thermal decomposition of ammonium metavanadate(V) has been studied at atmospheric pressure, at hydrothermal, and high-pressure conditions, respectively. In a closed high-pressure system a redox reaction between vanadium(V) and ammonia takes place, to yield with increasing temperature the compounds (NH 4) 2 V 6 0 12 (0H) 2 , VO : _ A (OH) A , and V 2 "0 2 "_,, the composition of the product eventually approaching V 2 0 3 at 1100 °C. All these compounds can easily be con-verted into V 2 O s by heating in air. The mid-infrared spectra of the decomposition products obtained by slow heating of NH 4 VO, in air, are virtually identical and show that ammonium hexavanadate(V), (NH 4) 2 V h O| 6 , is the most important, and perhaps only, intermediate in the "non-reduction" case. On further heating, (NH 4) 2 V 6 0 lft may not only loose ammonia and water to form V 2 0 5 but could as well partially be reduced by ammonia. This could explain the diversity of intermediate "compounds" described in the literature. Hydrothermal reaction of NH 4 VO, yielded (NH 4) 05 V 2 O 5 , (NH 4) 2 V,0 8 , and V 2 0 3 at rather low temperatures. 
  Reference    Z. Naturforsch. 43b, 309—317 (1988); received November 9 1987 
  Published    1988 
  Keywords    Ammonium Metavanadate(V), Thermal Decomposition, High-pressure Reactions, Hydrothermal Reactions 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0309.pdf 
 Identifier    ZNB-1988-43b-0309 
 Volume    43