The Se2 (Gas) Fugacity in Systems with Noble Metals: Chrisstanleyite Ag2Pd3Se4 – Naumannite Ag2Se–β-PdSe2 and Luberoite Pt5Se4–Sudovikovite PtSe2
| Autor: | A. V. Kristavchuk, Dmitriy A. Chareev, E. G. Osadchii, I. V. Vikentyev, N. S. Bortnikov, Anna Vymazalová |
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| Rok vydání: | 2019 |
| Předmět: |
Argon
010504 meteorology & atmospheric sciences Atmospheric pressure Analytical chemistry chemistry.chemical_element Electrolyte 010502 geochemistry & geophysics 01 natural sciences Chrisstanleyite chemistry Phase (matter) Earth and Planetary Sciences (miscellaneous) Galvanic cell General Earth and Planetary Sciences Fugacity Geology 0105 earth and related environmental sciences |
| Zdroj: | Doklady Earth Sciences. 485:439-443 |
| ISSN: | 1531-8354 1028-334X |
| DOI: | 10.1134/s1028334x19040214 |
| Popis: | 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 (argon under atmospheric pressure). The EMF vs. temperature 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 nonvariant equilibriums of Ag2Pd3Se4 (chrisstanleyite)–β-PdSe2 (the phase, which transforms into verbeekite under low temperatures)–Ag2Se (naumannite) and Pt5Se4 (luberoite)–PtSe2 (sudovikovite): logf Se2(gas) (Ag2Pd3Se4/Ag2Se/PdSe2) = 7.710 ± 0.050 – 8.524 ± 0.026(1000/T), logfSe2(gas) (Pt5Se4/PtSe2) = 7.135 ± 0.027 – 12.274 ± 0.016(1000/T). |
| Databáze: | OpenAIRE |
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