Gold chalcogenides
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2008-03-14T06:35:08Z
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'''Gold chalcogenides''' are compounds formed between
[[gold]] and one of the [[chalcogen]]s, elements from
[[group 16]] of the [[periodic table]]: [[oxygen]],
[[sulfur]], [[selenium]] or [[tellurium]].
*Gold(III) oxide, Au<sub>2</sub>O<sub>3</sub>. decomposes into gold and oxygen above 160 °C. dissolves in concentrated alkalis to form solutions which probably contain the [Au(OH)<sub>4</sub>]<sup>−</sup> ion
*Gold(I) sulfide, Au<sub>2</sub>S. formed by passing [[hydrogen sulfide]] through solutions of gold(I) compounds
*Gold(III) sulfide, Au<sub>2</sub>S<sub>3</sub>. unstable in the presence of water
*Gold tellurides: Au<sub>2</sub>Te<sub>3</sub>, Au<sub>3</sub>Te<sub>5</sub> and AuTe<sub>2</sub> are known as [[non-stoichiometric compound]]s. they show [[metallic conductivity]]. Au<sub>3</sub>Te<sub>5</sub> is a [[superconductor]] at very low temperatures.
==References==
{{Greenwood&Earnshaw}}
[[Category:Gold compounds]]
[[Category:Oxides]]
[[Category:Sulfides]]
[[Category:Tellurides]]
{{inorganic-compound-stub}}
[[nl:Goudchalcogeniden]]