Heavy metals in cement phases: on the solubility of Mg, Cd, Pb and Ba in Ca3Al2O6 |
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Authors: | AK Prodjosantoso BJ Kennedy |
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Affiliation: | a The Centre for Heavy Metals Research, School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia b Jursan Kimia, Universitas Negeri Yogyakarta, Yogyakarta, DIY 55281, Indonesia |
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Abstract: | The compounds formed when the divalent cations Mg2+, Cd2+, Ba2+ and Pb2+ are present during the preparation of Ca3Al2O6 have been studied using X-ray microanalysis and diffraction methods. The smaller Mg cations are found to partially substitute for Ca2+, and structural refinements show that Mg preferentially occupies the smaller six-coordinate sites in Ca3−xMgxAl2O6. When Ba is present, it preferentially occupies the larger eight- and nine-coordinate sites. X-ray microanalysis suggests that Pb and Cd are lost from the samples during the preparation process. The diffraction patterns show a small decrease in the lattice parameters, suggesting that a defect structure of the type Ca3−x(vac)xAl2O6 is formed. The distribution of products formed on hydration of the doped Ca3−xMxAl2O6 is found to be very different than that observed for the undoped material. |
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Keywords: | Heavy metals Crystal structure X-ray diffraction Ca3Al2O6 |
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