Antimony tetroxide
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| Template:Longitem | SbO2; Sb2O4 |
| Molar mass | 153.7588; 307.5176 g/mol |
| Appearance | white solid |
| Density | 6.64 g/cm3 (orthorhombic form) [1] |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Template:Longitem | 2.0 |
| Template:Longitem | orthorhombic |
| Template:Longitem | Antimony trioxide Antimony pentoxide |
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Antimony tetroxide is an inorganic compound with the formula Sb2O4. This material, which exists as the mineral cervantite,[2] 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.[3]
Formation and structure
The material forms when Sb2O3 is heated in air:[4]
- 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.[1] Both forms feature octahedral Sb(V) centers arranged in sheets with distorted Sb(III) centers bound to four oxides.