Journal
POWDER DIFFRACTION
Volume 18, Issue 1, Pages 7-15Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1154/1.1523079
Keywords
anhydrous cement; polymorphism; superstructure; X-ray powder diffraction
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So-called alite is a solid solution of tricalcium silicate Ca3SiO5 with a few percent of impurities. It constitutes the major phase of anhydrous Portland cement. In industrial compounds, alite crystallizes into two monoclinic forms designated M1 and M3. The possibility of correlation between the crystallographic structure of the clinker and its reactivity is still an open question. The answer of such a question involves a proper quantitative analysis of the various phases-including the exact alite polymorph-of the industrial product. The rather similar structure of the two alites makes it difficult to distinguish them from their XRD patterns. This paper shows that five angular windows in the X-ray diffraction patterns can be used with synthetic alites as well as industrial compounds, to identify the nature of the actual polymorph (M1 or M3) present and the structural model to be used (with or without superstructure) in subsequent Rietveld analysis of the data. (C) 2003 International Centre for Diffraction Data.
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