Acta Cryst. (2008). B64, 34-41 [ doi:10.1107/S0108768107066402 ]
Abstract: The crystal chemistries of synthetic mimetite, Pb10(As5+O4)6(Cl2 - xOx/2), a neutral apatite, and finnemanite, Pb10(As3+O3)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.
Keywords: powder diffraction; transmission electron microscropy; photoelectron spectroscopy; ceramics.
 |   Rietveld powder data file (CIF format) (58.4 kbytes) |
| Rietveld powder data file (CIF format) (96.3 kbytes) |
| Rietveld powder data file (CIF format) (96.3 kbytes) |
| Rietveld powder data file (CIF format) (96.3 kbytes) |
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