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Quantitative analysis of mineralized white Portland clinkers: The structure of Fluorellestadite

Published online by Cambridge University Press:  06 March 2012

Isabel Pajares ,
Ángeles G. De la Torre ,
Sagrario Martínez-Ramírez ,
Francisca Puertas ,
María-Teresa Blanco-Varela  and
Miguel A. G. Aranda
Isabel Pajares
Affiliation:
Instituto de Ciencias de la Construcción “Eduardo Torroja,” CSIC, C/Serrano Galvache s/n, 28033-Madrid, Spain
Ángeles G. De la Torre
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071-Málaga, Spain
Sagrario Martínez-Ramírez
Affiliation:
Instituto de Ciencias de la Construcción “Eduardo Torroja,” CSIC, C/Serrano Galvache s/n, 28033-Madrid, Spain
Francisca Puertas
Affiliation:
Instituto de Ciencias de la Construcción “Eduardo Torroja,” CSIC, C/Serrano Galvache s/n, 28033-Madrid, Spain
María-Teresa Blanco-Varela
Affiliation:
Instituto de Ciencias de la Construcción “Eduardo Torroja,” CSIC, C/Serrano Galvache s/n, 28033-Madrid, Spain
Miguel A. G. Aranda*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071-Málaga, Spain
*
a)Author to whom correspondence should be addressed: Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071-Málaga, Spain, Phone: Int+34 952131874, Fax: Int+34 952132000, electronic mail: g_aranda@uma.es
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Abstract

Fluorellestadite, Ca10(SiO4)3(SO4)3F2, has been synthesized as single phase. This compound crystallizes in the apatite type structure, s.g. P63/m, with parameters a=9.4417(1) Å, c=6.9396(1) Å and V=535.76(1) Å3. The refinement of its crystal structure converged to RWP=12.33% and RF=4.58%. The atomic parameters have been used to analyze the phase content of mineralized white Portland clinkers. These clinkers contain Ca3SiO5, Ca2SiO4, Ca12Al14O32F2 and Ca10(SiO4)3(SO4)3F2. The agreement between the elemental composition inferred from the Rietveld phase analysis and that measured by XRF is noteworthy. This comparison does not take into account the presence of amorphous phases and unmodeled elemental substitutions in crystalline phases. Similar Rietveld studies on commercial white Portland clinkers are also shown to be feasible.

Type
Technical Articles
Information
Powder Diffraction , Volume 17 , Issue 4 , December 2002 , pp. 281 - 286
Copyright
Copyright © Cambridge University Press 2002

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