Model apatite systems for the stabilization of toxic metals : II, cation and metalloid substitutions in chlorapatites
Kim, Jean Y.
White, Timothy John
Date of Issue2005
School of Materials Science and Engineering
Environmental chlorapatites, of the form A10(BxC1−xO4)6Cl2, where A=Ca, Cd, or Pb; B/C=P, V, or Cr and 0≤x≤1, were synthesized by solid-state reactions. Crystal structure variations, primarily lattice parameters, were examined through powder X-ray diffraction methods, while performance and long-term durability of these waste form apatites were assessed by a combination of the toxicity characteristic leaching procedure (TCLP) and the American Nuclear Society (ANS) method. As expected, an overall dilation of unit cell edges was observed with increasing ionic substitutions. However, a discontinuity in linearity was often observed, generally for x≥0.5. The correlation of microstructural changes and leach testing shows that lead chlorapatite is found to be more suitable for waste stabilization than calcium and cadmium analogues.
Journal of the American ceramic society
© 2005 The American Ceramic Society. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of the American Ceramic Society, The American Ceramic Society. 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/10.1111/j.1551-2916.2005.00136.x ].