|CAS number||, 1332-81-6|
|Molecular formula||SbO2; Sb2O4|
|Molar mass||153.7588; 307.5176 g/mol|
|Density||6.64 g/cm3 (orthorhombic form) |
|Solubility in water||insoluble|
|Refractive index (nD)||2.0|
|Related compounds||Antimony trioxide
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
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. The material, with empirical formula SbO2, is called antimony tetroxide to signify the presence of two kinds of Sb centers.
Formation and structure
- 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 mixed valence, containing both Sb(V) and Sb(III) centers. Two polymorphs are known, one orthorhombic (shown in the infobox) and one monoclinic. Both forms feature octahedral Sb(V) centers arranged in sheets with distorted Sb(III) centers bound to four oxides.
- J. Amador, E. Gutierrez Puebla, M. A. Monge, I. Rasines, and C. Ruiz Valero "Diantimony Tetraoxides Revisited" Inorganic Chemistry 1988, Volume 27, pp. 1367–1370. doi:10.1021/ic00281a011
- "Cervantite". Webminerals. Retrieved 2009-06-06.
- Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.