SOLID SOLUTION SERIES OF FERRATE AND ALUMINATE PHASES IN OPC: PART Ⅰ. THE FERRATE PHASE

摘要

X-ray diffraction analysis supported by Rietveld refinement allows quantitative phase analysis simultaneously with determination of the iron content of the Ferrate phase. The difference between actual and calculated chemical composition is determined to be x +- 0.06, related to the common formula C_6A_xF_(3-x). Variable chemical composition, changing distribution of AI~(3+) and Fe~(3+) on tetrahedral and octahedral sites and variable preferred orientation of the Ferrates are prohibiting quantitative XRD analysis using single peak methods. Ferrates from technically produced OPC clinkers which incorporate additionally Mg and Si in their structure can also be analyzed by XRD methods. The chemical composition of this Ferrates is variable with very low iron contents down to C_6(A,S,M)_(2.39)F_(0.61). Changing operating conditions as well as variation of the raw mix influence the chemical composition and the quantitative content of the Ferrate phase.