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Tellurium trioxide

Names
Other names tellurium(VI) oxide
Identifiers
CAS Number	13451-18-8
3D model (JSmol)	Interactive image
ChemSpider	75319
ECHA InfoCard	100.033.277
PubChem CID	83481
CompTox Dashboard (EPA)	DTXSID6065472
InChI InChI=1S/O3Te/c1-4(2)3Key: IIXQANVWKBCLEB-UHFFFAOYSA-N InChI=1/O3Te/c1-4(2)3Key: IIXQANVWKBCLEB-UHFFFAOYAH
SMILES O=(=O)=O
Properties
Chemical formula	TeO3
Molar mass	175.6 g/mol
Appearance	yellow-orange crystals (α-TeO3)
Density	5.07 g/cm³, solid
Melting point	430°C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Tellurium trioxide (TeO₃) is an inorganic chemical compound of tellurium and oxygen. In this compound, tellurium is in the +6 oxidation state.

Polymorphs

There are two forms, yellow-red α-TeO₃ and grey, rhombohedral, β-TeO₃ which is less reactive.
α-TeO₃ has a structure similar to FeF₃ with octahedral TeO₆ units that share all vertices.

Preparation

α-TeO3 can be prepared by heating orthotelluric acid, Te(OH)₆, at over 300°C . The β-TeO₃ form can be prepared by heating α-TeO₃ in a sealed tube with O₂ and H₂SO₄.
α-TeO₃ is unreactive to water but is a powerful oxidising agent when heated. With alkalis it forms tellurates.
α-TeO₃ when heated loses oxygen to form firstly Te₂O₅ and then TeO₂.

References

1. ^ Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5
2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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