|Molar mass||175.6 g/mol|
|Appearance||yellow-orange crystals (α-TeO)|
|Density||5.07 g/cm³, solid|
|Melting point||430 °C (806 °F; 703 K)|
EU classification (DSD)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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There are two forms, yellow-red α-TeO and grey, rhombohedral, β-TeO which is less reactive.
α-TeO has a structure similar to FeF with octahedral TeO units that share all vertices.
α-TeO can be prepared by heating orthotelluric acid, Te(OH), at over 300°C . The β-TeO form can be prepared by heating α-TeO in a sealed tube with O and HSO.
α-TeO is unreactive to water but is a powerful oxidising agent when heated. With alkalis it forms tellurates.
α-TeO when heated loses oxygen to form firstly TeO and then TeO.
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