Email this article The Se2 (GAS) fugacity in systems with noble metals: chrisstanleyite Ag2Pd3Se4-naumannite Ag2Se-β-PdSe2 and luberoite Pt5Se4-sudovikovite PtSe2
- Authors: Kristavchuk A.V.1, Vymazalova A.2, Osadchii E.G.1, Vikentyev I.V.3, Chareev D.A.1,4,5, Bortnikov N.S.3
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Affiliations:
- D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences
- České geologické služby
- Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
- Institute of Physics and Technology of the Ural Federal University
- Kazan Federal University
- Issue: Vol 485, No 6 (2019)
- Pages: 720-725
- Section: Geochemistry
- URL: https://journals.eco-vector.com/0869-5652/article/view/14443
- DOI: https://doi.org/10.31857/S0869-56524856720-725
- ID: 14443
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Abstract
The reactions of 6Ag(cr) + 3PdSe2(cr) = 2Ag2Se(cr) + Ag2Pd3Se4(cr) and 12Ag(cr) + 5PtSe2(cr) = 6Ag2Se(cr) + Pt5Se4(cr) were studied with the EMF method in a completely solid-state galvanic cell with an Ag ion-conducting solid electrolyte with overall gas space (Ar under atmospheric pressure). The EMF vs T dependencies were obtained in the temperature ranges of Т = 425-648 K and 501-713 K, respectively. Then, they were recalculated for gaseous Se fugacity in dependence on the temperature for non-variant equilibriums of Ag2Pd3Se4 (chrisstanleyite)-β-PdSe2 (the phase, which transforms into verbeekite under low temperatures)-Ag2Se (naumannite) and Pt5Se4 (luberoite)-PtSe2 (sudovikovite): logfSe2(gas)(Ag2Pd3Se4/Ag2Se/PdSe2) = 7.71 ± 0.05 - 8.524 ± 0.026(1000/T), logfSe2(gas)(Pt5Se4/PtSe2) = 7.135 ± 0.027 - 12.274 ± 0.016(1000/T).
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About the authors
A. V. Kristavchuk
D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences
Email: charlic@mail.ru
Russian Federation, 4, Academica Osypyana ul., Chernogolovka, Moscow region, 142432
A. Vymazalova
České geologické služby
Email: charlic@mail.ru
Czech Republic, 131/3, Klárov, Praha, 118 00
E. G. Osadchii
D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences
Email: charlic@mail.ru
Russian Federation, 4, Academica Osypyana ul., Chernogolovka, Moscow region, 142432
I. V. Vikentyev
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: charlic@mail.ru
Russian Federation, 35, Staromonetny, Moscow, 119017
D. A. Chareev
D.S. Korzhinskii Institute of Experimental Mineralogy of Russian Academy of Sciences; Institute of Physics and Technology of the Ural Federal University; Kazan Federal University
Author for correspondence.
Email: charlic@mail.ru
Russian Federation, 4, Academica Osypyana ul., Chernogolovka, Moscow region, 142432; 21, Mira street, Yekaterinburg, 620062; 18, Kremliovskaya street, Kazan, 420008
N. S. Bortnikov
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: charlic@mail.ru
Academician of the Russian Academy of Sciences
Russian Federation, 35, Staromonetny, Moscow, 119017References
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