Lookup NU author(s): Dr Stevin Pramana
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The crystal chemistries of synthetic mimetite, Pb10(As 5+O4)6(Cl2-xOx/2), a neutral apatite, and finnemanite, Pb10(As3+O 3)6Cl2, a reduced apatite, were characterized using a combination of X-ray powder diffraction, neutron diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Both phases conform to hexagonal P63/m symmetry; however, the temperature-driven transformation of clinomimetite to mimetite described earlier was not confirmed. The average mimetite structure is best described through the introduction of partially occupied oxygen sites. A better understanding of the mixed arsenic speciation in apatites can guide the formulation of waste form ceramics and improve models of long-term durability after landfill disposal. © 2008 International Union of Crystallography Printed in Singapore - all rights reserved.
Author(s): Baikie T, Ferraris C, Klooster WT, Madhavi S, Pramana SS, Pring A, Schmidt G, White TJ
Publication type: Article
Publication status: Published
Journal: Acta Crystallographica Section B: Structural Science
Print publication date: 01/02/2008
ISSN (print): 0108-7681
ISSN (electronic): 0108-7681
PubMed id: 18204209
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