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Neutron powder diffraction investigation of model cement compounds
A series of synthetic cement compounds: mono- and triclinic-tricalcium silicate, beta-dicalcium silicate, cubic- and orthorhombic-tricalcium aluminate and tetracalcium alumino-ferrite have been analyzed with neutron powder diffraction followed by Rietveld refinement. Generally good fits have been obtained and the results form the basis for analysis of cement hydration using neutron diffraction. The materials were synthesized by use of calcium carbonate and the respective oxides. After mixing the samples were sintered and afterwards analyzed for the atom coordinates and the isotropic thermal factors. For monoclinic tricalcium silicate, the relative orientation of the SiO4 tetraedra is strongly dependent on on the amount and species of impurities present. The oxygen atoms could be attributed to the calcium and the silicium atoms. It is necessary to use the more accurate monoclinic or triclinic crystal structure in the analysis, the simpler rhombohedral pseudo-structure cannot provide a reasonable fit to the neutron data. Using the structural parameters from other authors for beta dicalcium-silicate gave poor fits for the experimental data. Anyway, with incorrect X-ray structure produced atom coordinates were in good agreement with correct X-ray structural analysis. The results for cubic and orthorhombic tricalcium aluminate are in general agreement with the X-ray results. For calcium aluminate ferrite the neutron diffraction data can be used to abtain reasonable results for the Al2O3/Fe2O3 ratio when producing the structural refindement. All data can be compared to results by other authors and can be a starting point for investigations of the hydration kinetics of cement compounds using neutron powder diffraction.
Neutron powder diffraction investigation of model cement compounds
A series of synthetic cement compounds: mono- and triclinic-tricalcium silicate, beta-dicalcium silicate, cubic- and orthorhombic-tricalcium aluminate and tetracalcium alumino-ferrite have been analyzed with neutron powder diffraction followed by Rietveld refinement. Generally good fits have been obtained and the results form the basis for analysis of cement hydration using neutron diffraction. The materials were synthesized by use of calcium carbonate and the respective oxides. After mixing the samples were sintered and afterwards analyzed for the atom coordinates and the isotropic thermal factors. For monoclinic tricalcium silicate, the relative orientation of the SiO4 tetraedra is strongly dependent on on the amount and species of impurities present. The oxygen atoms could be attributed to the calcium and the silicium atoms. It is necessary to use the more accurate monoclinic or triclinic crystal structure in the analysis, the simpler rhombohedral pseudo-structure cannot provide a reasonable fit to the neutron data. Using the structural parameters from other authors for beta dicalcium-silicate gave poor fits for the experimental data. Anyway, with incorrect X-ray structure produced atom coordinates were in good agreement with correct X-ray structural analysis. The results for cubic and orthorhombic tricalcium aluminate are in general agreement with the X-ray results. For calcium aluminate ferrite the neutron diffraction data can be used to abtain reasonable results for the Al2O3/Fe2O3 ratio when producing the structural refindement. All data can be compared to results by other authors and can be a starting point for investigations of the hydration kinetics of cement compounds using neutron powder diffraction.
Neutron powder diffraction investigation of model cement compounds
Untersuchungen an modellhaften Klinkermineralpulvern mittels Neutronenbeugung
Berliner, R. (author) / Ball, C. (author) / West, P.B. (author)
Cement and Concrete Research ; 27 ; 551-575
1997
25 Seiten, 7 Bilder, 13 Tabellen, 22 Quellen
Article (Journal)
English
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