| Names | |
|---|---|
| Other names tellurium(VI) oxide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.033.277 |
| EC Number |
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| UNII | |
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| Properties | |
| TeO3 | |
| Molar mass | 175.6 g/mol |
| Appearance | yellow-orange crystals (α-TeO3) |
| Density | 5.07 g/cm3, solid |
| Melting point | 430 °C (806 °F; 703 K) |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Tellurium trioxide (TeO3) is aninorganicchemical compound oftellurium andoxygen. In this compound, tellurium is in the +6oxidation state.
There are two forms, yellow-red α-TeO3 and grey, rhombohedral, β-TeO3 which is less reactive.[1]
α-TeO3 has a structure similar toFeF3 with octahedral TeO6 units that share all vertices.[2]
α-TeO3 can be prepared by heatingorthotelluric acid, Te(OH)6, at over 300 °C.[1] 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.[2] With alkalis it formstellurates.[2]
α-TeO3 when heated loses oxygen to form firstly Te2O5 and thenTeO2.[1]
