Gold chalcogenides
Gold chalcogenides are compounds formed between gold and one of the chalcogens, elements from group 16 of the periodic table: oxygen, sulfur, selenium, or tellurium.
- Gold(III) oxide, Au2O3. Decomposes into gold and oxygen above 160 °C, and dissolves in concentrated alkalis to form solutions which probably contain the [Au(OH)4]− ion
- Gold(I) sulfide, Au2S. Formed by passing hydrogen sulfide through solutions of gold(I) compounds.
- Gold(III) sulfide, Au2S3, unstable in the presence of water.
- Gold tellurides: Au2Te3, Au3Te5, and AuTe2 (approximate formulæ) are known as non-stoichiometric compounds. They show metallic conductivity. Two tellurides of gold are superconductors at very low temperatures: AuTe3 (2.6 K) and Au3Te5 (1.62 K).[1]
Natural gold tellurides, like calaverite and krennerite (AuTe2), petzite ( Ag3AuTe2), and sylvanite (AgAuTe4), are minor ores of gold (and tellurium). See telluride minerals for more information on individual naturally occurring tellurides.
References
- ↑ Luo, H.L.; Merriam, M.F.; Hamilton, D.C. (1964). "Superconducting Metastable Compounds". Science. 145: 581–583. doi:10.1126/science.145.3632.581. PMID 17735806. Retrieved 25 October 2015.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
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