Abstract: The pure γ-Ca₂SiO₄ (γ-C₂S) phase was prepared at 1623 K of calcining temperature, 10 h of holding time and furnace cooling. The β-C₂S phase was obtained through γ-C₂S conversion with the following calcination system which was adopted at 1473 K of calcining temperature, 1 h of holding time and then water-cooling. The conversion rate of γ-C₂S was studied by the Rietveld quantitative laboratory X-ray powder diffraction supported by synchrotron X-ray diffraction images. The refinement results show that the final conversion rate of γ-C₂S is higher than 92%. The absolute error of the γ-C₂S conversion rate between two Rietveld refinements (sample with or without α-Al₂O₃) is 3.6%, which shows that the Rietveld quantitative X-ray diffraction analysis is an appropriate and accurate method to quantify the γ-C₂S conversion rate.

Key words: γ-C₂S, β-C₂S, Rietveld quantification, Synchrotron X-ray diffraction image

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