Crystal chemistry of mimetite, Pb10(AsO4) 6Cl1.48O0.26, and finnemanite, Pb 10(AsO3)6Cl2

Tom Baikie; Cristiano Ferraris; Wim T. Klooster; S. Madhavi; Stevin S. Pramana; Allan Pring; G. Schmidt; T. J. White

doi:10.1107/S0108768107066402

Crystal chemistry of mimetite, Pb₁₀(AsO₄) ₆Cl_1.48O_0.26, and finnemanite, Pb ₁₀(AsO₃)₆Cl₂

Tom Baikie^*, Cristiano Ferraris, Wim T. Klooster, S. Madhavi, Stevin S. Pramana, Allan Pring, G. Schmidt, T. J. White

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

The crystal chemistries of synthetic mimetite, Pb₁₀(As ⁵⁺O₄)₆(Cl_2-xO_x/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.

Original language	English
Pages (from-to)	34-41
Number of pages	8
Journal	Acta Crystallographica Section B: Structural Science
Volume	64
Issue number	1
DOIs	https://doi.org/10.1107/S0108768107066402
Publication status	Published - Jan 17 2008
Externally published	Yes

ASJC Scopus Subject Areas

General Biochemistry,Genetics and Molecular Biology

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title = "Crystal chemistry of mimetite, Pb10(AsO4) 6Cl1.48O0.26, and finnemanite, Pb 10(AsO3)6Cl2",

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.",

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language = "English",

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journal = "Acta Crystallographica Section B: Structural Science",

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T1 - Crystal chemistry of mimetite, Pb10(AsO4) 6Cl1.48O0.26, and finnemanite, Pb 10(AsO3)6Cl2

AU - Baikie, Tom

AU - Ferraris, Cristiano

AU - Klooster, Wim T.

AU - Madhavi, S.

AU - Pramana, Stevin S.

AU - Pring, Allan

AU - Schmidt, G.

AU - White, T. J.

PY - 2008/1/17

Y1 - 2008/1/17

N2 - 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.

AB - 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.

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Crystal chemistry of mimetite, Pb₁₀(AsO₄) ₆Cl_1.48O_0.26, and finnemanite, Pb ₁₀(AsO₃)₆Cl₂

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