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Crystal chemistry of mimetite, Pb10(AsO4) 6Cl1.48O0.26, and finnemanite, Pb10(AsO3)6Cl2

Lookup NU author(s): Dr Stevin Pramana

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Abstract

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.


Publication metadata

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

Year: 2008

Volume: 64

Issue: 1

Pages: 34-41

Print publication date: 01/02/2008

ISSN (print): 0108-7681

ISSN (electronic): 0108-7681

Publisher: Wiley-Blackwell

URL: https://doi.org/10.1107/S0108768107066402

DOI: 10.1107/S0108768107066402

PubMed id: 18204209


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