Tellurium trioxide
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| Tellurium trioxide | |
|---|---|
| Other names | tellurium(VI) oxide |
| Identifiers | |
| CAS number | [13451-18-8] |
| Properties | |
| Molecular formula | TeO3 |
| Molar mass | 175.6 g/mol |
| Appearance | yellow-orange crystals (α-TeO3) |
| Density | 5.07 g/cm³, solid |
| Melting point |
430°C |
| Hazards | |
| EU classification | not listed |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Tellurium trioxide (TeO3) is an inorganic chemical compound of tellurium and oxygen. Tellurium is in the +6 oxidation 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 to FeF3 with octahedral TeO6 units that share all vertices.[2]
α-TeO3 can be prepared by heating orthotelluric 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 forms tellurates.[2]
α-TeO3 when heated loses oxygen to form firstly Te2O5 and then TeO2.[1]
[edit] References
- ^ a b c Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0123526515
- ^ a b c Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
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