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Title: Crystal chemistry of vanadium-bearing ellestadite waste forms
Authors: Fang, Y
Page, SJ
Rees, GJ
Avdeev, M
Hanna, JV
White, TJ
Keywords: X-ray diffraction
Neutron diffraction
Transition elements
Magnetic resonance
Electron microprobe analysis
Fourier analysis
Issue Date: 16-Jul-2018
Publisher: American Chemical Society
Citation: Fang, Y., Page, S. J., Rees, G. J., Avdeev, M., Hanna, J. V., & White, T. J. (2018). Crystal chemistry of vanadium-bearing ellestadite waste forms. Inorganic chemistry, 57(15), 9122-9132. doi:10.1021/acs.inorgchem.8b01160
Abstract: Vanadate ellestadites Ca10(SiO4)x(VO4)6–2x(SO4)xCl2, serving as prototype crystalline matrices for the fixation of pentavalent toxic metals (V, Cr, As), were synthesized and characterized by powder X-ray and neutron diffraction (PXRD and PND), electron probe microanalysis (EPMA), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (SS-NMR). The ellestadites 0.19 < x < 3 adopt the P63/m structure, while the vanadate endmember Ca10(VO4)6Cl2 is triclinic with space group P1̅. A miscibility gap exists for 0.77 < x < 2.44. The deficiency of Cl in the structure leads to short-range disorder in the tunnel. Toxicity characteristic leaching testing (TCLP) showed the incorporation of vanadium increases ellestadite solubility, and defined a waste loading limit that should not exceed 25 atom % V to ensure small release levels. © 2018 American Chemical Society
ISSN: 1520-510X
Appears in Collections:Journal Articles

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