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Thermodynamic Properties of Superionic Phase Ag4HgSe2I2 Determined by the EMF Method

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Abstract

Triangulation of the Ag-Hg-Se-I system in the vicinity of quaternary phase Ag4HgSe2I2 was performed by differential thermal analysis, X-ray diffraction and electromotive force (EMF) methods. The spatial position of the phase region Ag4HgSe2I2-Se-HgI2 regarding the figurative point of silver was used to write the chemical reaction of formation of Ag4HgSe2I2. The EMF measurements were carried out by applying an electrochemical cell: (–) C|Ag|Ag2GeS3 glass|Ag4HgSe2I2, HgI2, Se|C (+), where C is graphite and Ag2GeS3 glass is the fast purely Ag+ ions conducting electrolyte. The linear dependence of the EMF of the electrochemical cell on temperature was used to determine the standard thermodynamic values of Ag4HgSe2I2 for the first time.

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Acknowledgments

The authors are grateful to the Johan Gadolin Scholarship programme and Academy of Finland for financial support. This work was carried out under the project “Thermodynamic investigation of complex inorganic material systems for improved renewable energy and metals production processes” as part of the activities of the Johan Gadolin Process Chemistry Centre at Åbo Akademi University.

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Correspondence to Mykola Moroz.

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Moroz, M., Tesfaye, F., Prokhorenko, M. et al. Thermodynamic Properties of Superionic Phase Ag4HgSe2I2 Determined by the EMF Method. J. Phase Equilib. Diffus. 39, 11–16 (2018). https://doi.org/10.1007/s11669-017-0602-3

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  • DOI: https://doi.org/10.1007/s11669-017-0602-3

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