Antimony tetroxide

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Antimony tetroxide
Sb2O4 structure.jpg
     An      O
Names
IUPAC name
antimony(III,V) oxide
Identifiers
1332-81-6 N
PubChem 74002
Properties
SbO2; Sb2O4
Molar mass 153.7588; 307.5176 g/mol
Appearance white solid
Density 6.64 g/cm3 (orthorhombic form) [1]
Melting point > 930 °C (1,710 °F; 1,200 K) (decomposes)
Boiling point decomposes
insoluble
2.0
Structure
orthorhombic
Vapor pressure {{{value}}}
Related compounds
Related compounds
Antimony trioxide
Antimony pentoxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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.

Formation and structure

The material forms when Sb2O3 is heated in air:[3]

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.

References

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  3. Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.