Crystal chemical characteristics of ellestadite-type apatite: implications for toxic metal immobilizationElectronic supplementary information (ESI) available: Neutron crystallographic files in CIF format; examples of the output of SVDdiagnostic of Rietveld refinements of ellestadites; bond lengths of refined monoclinic structures; data of electron probe microanalysis; FTIR spectra of HCl washed samples; experimental and calculated neutron diffraction patterns. CCDC 996152-996157. For ESI and cry
The ellestadite apatites Ca 10 [(SiO 4 ) x (PO 4 ) 6−2 x (SO 4 ) x ]Cl 2 were studied by powder X-ray and neutron diffraction to establish baseline crystallographic data. These synthetic materials, unlike mineral specimens that are well equilibrated, show no Si/P/S ordering and conform to P 6 3 / m...
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| Main Authors | , , |
|---|---|
| Format | Journal Article |
| Language | English |
| Published |
08.10.2014
|
| Online Access | Get full text |
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| Summary: | The ellestadite apatites Ca
10
[(SiO
4
)
x
(PO
4
)
6−2
x
(SO
4
)
x
]Cl
2
were studied by powder X-ray and neutron diffraction to establish baseline crystallographic data. These synthetic materials, unlike mineral specimens that are well equilibrated, show no Si/P/S ordering and conform to
P
6
3
/
m
symmetry. Phosphate-rich ellestadites where 0 ≤
x
≤ 1 show chemical stability towards Toxicity Characterization Leaching Procedure (TCLP) testing and are potential immobilization matrices for mixed toxic metal wastes.
Ellestadites are silicate-sulphate apatite matrices for the immobilization of toxic metal waste. Phosphate-rich chlorellestadite, Ca
10
[(SiO
4
)
x
(PO
4
)
6−2
x
(SO
4
)
x
]Cl
2
(0 ≤
x
≤ 1) show promise as ceramic waste forms for hazardous fly ashes rich in sulphur and chlorine. |
|---|---|
| Bibliography: | For ESI and crystallographic data in CIF or other electronic format see DOI 10.1039/c4dt02088j 996152-996157 Electronic supplementary information (ESI) available: Neutron crystallographic files in CIF format; examples of the output of SVDdiagnostic of Rietveld refinements of ellestadites; bond lengths of refined monoclinic structures; data of electron probe microanalysis; FTIR spectra of HCl washed samples; experimental and calculated neutron diffraction patterns. CCDC |
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c4dt02088j |