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Title: Crystal chemistry of vanadium-bearing ellestadite waste forms
Authors: Fang, Yanan
Page, Sam J.
Rees, Gregory J.
Avdeev, Maxim
Hanna, John V.
White, Tim J.
Keywords: Engineering::Materials
Issue Date: 2018
Source: 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
Journal: Inorganic chemistry
Abstract: Vanadate ellestadites Ca10(SiO4) x(VO4)6-2 x(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.
ISSN: 0020-1669
DOI: 10.1021/acs.inorgchem.8b01160
Rights: © 2018 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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