Open AccessCrystal chemistry of mimetite, Pb 10 (AsO 4 ) 6 Cl 1.48 O 0.26 , and finnemanite, Pb 10 (AsO 3 ) 6 Cl 2
Author(s) -
Baikie Tom,
Ferraris Cristiano,
Klooster Wim T.,
Madhavi S.,
Pramana Stevin S.,
Pring Allan,
Schmidt G.,
White T. J.
Publication year - 2008
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
eISSN - 1600-5740
pISSN - 0108-7681
DOI - 10.1107/s0108768107066402
Subject(s) - chemistry , crystal chemistry , hexagonal crystal system , crystal structure , transmission electron microscopy , crystallography , arsenic , ceramic , crystal (programming language) , oxygen , neutron diffraction , single crystal , chemical engineering , mineralogy , inorganic chemistry , oxygen atom , x ray photoelectron spectroscopy
The crystal chemistries of synthetic mimetite, Pb 10 (As 5+ O 4 ) 6 (Cl 2 − x O x /2 ), a neutral apatite, and finnemanite, Pb 10 (As 3+ O 3 ) 6 Cl 2 , 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 P 6 3 / 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.
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