The Se2 (GAS) fugacity in systems with noble metals: chrisstanleyite Ag2Pd3Se4-naumannite Ag2Se-β-PdSe2 and luberoite Pt5Se4-sudovikovite PtSe2

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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).

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, 119017

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