Abstract
The effect of temperature exposure on the elemental iron and other metal contents in specimens based on natural montmorillonite-containing clay of Orenburg oblast has been investigated. The content of iron, copper, and cobalt in the specimens after drying and sintering through stepwise annealing from 300 to 1000°C has been determined using X-ray fluorescence analysis. The maximum content of Fe, Cu, and Co metals in the system has been indicated after removal of physically bound water. With an increase in the temperature of annealing to 300–500°C, the content of all three metals decreases, because organic components are burned. At the temperature of 700°C, the copper content decreases by a factor of 1.3, while the cobalt and iron contents decrease by a factor of 1.5 and 1.7, respectively, owing to active redox chemical reactions. A decrease in the incorporation of iron in the crystal lattices of the phases of ceramic materials provides a decrease in the rates of phase transformations and an increase in the degree of structural homogeneity.
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