Crystal chemical characteristics of ellestadite-type apatite: implications for toxic metal immobilization
Fang, Ya Nan
White, Timothy John
Date of Issue2014
School of Materials Science and Engineering
Energy Research Institute @NTU
The ellestadite apatites Ca10[(SiO4)x(PO4)6−2x(SO4)x]Cl2 were studied by powder X-ray and neutron diffraction to establish baseline crystallographic data. These synthetic materials, unlike mineral specimens that are well equilibrated, show no Si/P/S ordering and conform to P63/m symmetry. Phosphate-rich ellestadites where 0 ≤ x ≤ 1 show chemical stability towards Toxicity Characterization Leaching Procedure (TCLP) testing and are potential immobilization matrices for mixed toxic metal wastes.
© 2014 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Dalton Transactions, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1039/C4DT02088J].