This is an old revision of this page, as edited by Smokefoot (talk | contribs) at 00:29, 2 May 2008 (start short article). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 00:29, 2 May 2008 by Smokefoot (talk | contribs) (start short article)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)Antimony tetroxide is an inorganic compound with the formula Sb2O4. This material, which exists as the mineral cervantite, is white but reversibly yellows upon heating. It is called antimony tetroxide to signify that it contains two kinds of Sb centers, although it is polymeric and the empirical formula is SbO2.
Formation and structure
The material forms when Sb2O3 is heated in air:
- Sb2O3 + 0.5 O2 → Sb2O4 ΔH = -187 kJ/mol
At 800 ″C, antimony(V) oxide loses oxygen to give the same material:
- Sb2O5 → Sb2O4 + 0.5 O2 ΔH = -64 kJ/mol
The material is a a mixed valence, with both Sb(V) and Sb(III) centers. In the solid, pyramidal Sb(III) centers are bound to three oxides and octahedral Sb(V) centers are bound to six oxides.
References
- Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.