Abstract
Publisher Summary This chapter discusses the evaluation of the Electromotive force (EMF) from a potential phase diagram for a quaternary system. When studying the EMF of a certain electrolytic cell at 1 bar and 1000 K, the results are needed to be checked by comparing with the information given in the form of potential phase diagrams. The chapter presents potential phase diagrams for the Cu–O–S system and Mn–O–S system at 1000 K. By assuming that there is no solubility of Cu in the Mn phases and no solubility of Mn in the Cu phases, one can construct a potential phase diagram for the quaternary Cu–Mn–O–S system by plotting all the lines in the same diagram.
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