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Synthetic Gold Chalcogenides in the Au–Te–Se–S System and Their Natural Analogs

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Abstract

Quaternary chalcogenides of AuX (AuTe0.7Se0.2S0.1), Au3X10 (Au3Te6Se3S, Au3Te6Se2.5S1.5), and AuX2 (AuTe1.8Se0.2, AuTe1.8Se0.1S0.1) composition were synthesized for the first time in the Au‒Te‒Se‒S system, where Te ≥ Se + S. They are produced by dry synthesis upon heating a mixture of elementary substances with compositions of AuTe0.666Se0.167S0.167 (X/Au = 1, X = Σ(Te + Se + S)), AuTeSe0.5S0.5 (X/Au = 2), AuTe2Se1.125S0.375, AuTe2Se0.75S0.75 (X/Au = 3.5), and AuTe2.5SeS0.5 (X/Au = 4) in vacuum quartz ampoules from 25–700°C and annealing at 400°C. According to XRD, the synthetic Au chalcogenides of AuTe1.8(Se,S)0.2 composition correspond to calaverite (α-AuTe2). The unidentified XRD peaks belong to AuX and Au3X10. They are synthetic analogs of previously unknown natural compounds, which were found in the Gaching area of the Maletoivayam ore field (Central Kamchatka volcanic belt). The compositions of natural phases span the following ranges: Au0.99–1.00Te0.70–0.71Se0.25–0.27S0.03–0.06 and Au2.91–3.08Te5.85–6.06Se1.57–3.66S2.63–0.44. The Raman spectra of synthetic and natural Au chalcogendies close in composition are identical.

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ACKNOWLEDGMENTS

The authors are grateful to N.S. Karmanov, V.N. Ko-rolyuk, and M.D. Khlestov (Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences) for microprobe studies and I.N. Kupriyanov (Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences) for registration of the Raman spectra.

Funding

This work was supported by a state contract of the Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences (project no. 0330‒2016‒0001), and the Russian Foundation for Basic Research (project no. 19‒05‒00316a).

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    G. A. Palyanova, N. D. Tolstykh, V. Yu. Zinina, K. A. Kokh & Yu. V. Seryotkin

  2. Novosibirsk National Research State University, 630090, Novosibirsk, Russia

    G. A. Palyanova, N. D. Tolstykh, V. Yu. Zinina, K. A. Kokh & Yu. V. Seryotkin

  3. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    N. S. Bortnikov

Authors
  1. G. A. Palyanova
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  2. N. D. Tolstykh
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  3. V. Yu. Zinina
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  4. K. A. Kokh
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  5. Yu. V. Seryotkin
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  6. N. S. Bortnikov
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Correspondence to G. A. Palyanova.

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Translated by I. Melekestseva

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Palyanova, G.A., Tolstykh, N.D., Zinina, V.Y. et al. Synthetic Gold Chalcogenides in the Au–Te–Se–S System and Their Natural Analogs. Dokl. Earth Sc. 487, 929–934 (2019). https://doi.org/10.1134/S1028334X19080099

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