Abstract
Results from a study of the Rb-Cr-O system in the presence of liquid rubidium metal are presented. Compound formation in the system was studied by means of bulk reactions between various chromium oxides and rubidium metal at 500° C followed by vacuum distillation of the excess metal and X-ray powder diffraction analysis of the residues. Equilibrium oxygen potential measurements of Rb-O solutions in contact with chromium metal or chromium compounds using an electrochemical oxygen meter (ThO2/7.5 wt%Y2O3 electrolyte, Sn/SnO2 reference electrode) gave information on the stability and conditions of formation of these compounds in the liquid. The investigations showed that Cr metal getters oxygen from rubidium to form a compound (possibly RbCrO2) in equilibrium with low oxygen activities (a0 = 5.43 × 10−7, 500°C). At higher oxygen levels, however, the formation of Rb4CrO4 takes place. A metastable phase Rb3CrO4 was also observed in some bulk reactions.
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