- Gold chalcogenides
Gold chalcogenides are compounds formed between
goldand one of the chalcogens, elements from group 16of the periodic table: oxygen, sulfur, seleniumor tellurium.
*Gold(III) oxide, Au2O3. decomposes into gold and oxygen above 160 °C. dissolves in concentrated alkalis to form solutions which probably contain the [Au(OH)4] − ion
*Gold(I) sulfide, Au2S. formed by passing
hydrogen sulfidethrough solutions of gold(I) compounds
*Gold(III) sulfide, Au2S3. unstable in the presence of water
*Gold tellurides: Au2Te3, Au3Te5 and AuTe2 are known as
non-stoichiometric compounds. they show metallic conductivity. Au3Te5 is a superconductorat very low temperatures.
Natural gold tellurides, like
calaveriteAuTe2 and sylvanite AgAuTe4, are minor ores of gold (and tellurium).
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