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Tellurium trioxide

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Title: Tellurium trioxide  
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Subject: Selenium trioxide, Sulfur trioxide, Oxides, Tellurium compounds, Tritellurium dichloride
Collection: Interchalcogens, Oxides, Tellurium Compounds
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Tellurium trioxide

Tellurium trioxide
Names
Other names
tellurium(VI) oxide
Identifiers
ChemSpider  Y
Jmol-3D images Image
PubChem
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)
Hazards
not listed
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 Y  (: Y/N?)

Tellurium trioxide (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.[1]
α-TeO3 has a structure similar to FeF3 with octahedral TeO6 units that share all vertices.[2]

Preparation

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]

References

  1. ^ a b c Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5
  2. ^ a b c  
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