Abstract
The formation of ternary compounds in the systems K-Cr-O and K-Fe-O was studied by reacting liquid potassium and/or potassium oxide with oxides of chromium and of iron at 500 °C for 336 h. The resulting compounds were isolated by distilling off the excess potassium metal under high vacuum and characterized by chemical and X-ray powder diffraction methods. Measurements of the equilibrium oxygen potential of these compounds in liquid potassium were carried out using an electrochemical oxygen meter utilizing thoria-7.5wt.%yttria (YDT) as solid electrolyte, from which the standard free energies of formation of the various ternary compounds and the threshold oxygen concentrations to form these compounds in liquid potassium were calculated.
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