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Title: Synthesis and structural characterisation of new ettringite and thaumasite type phases: Ca6[Ga(OH)6•12H2O]2(SO4)3•2H2O and Ca6[M(OH)6•12H2O]2(SO4)2(CO3)2, M = Mn, Sn
Authors: Norman, Rachel L.
Dann, Sandra E.
Hogg, Simon C.
Kirk, Caroline A.
Keywords: Ettringite
Thaumasite
X-ray diffraction
Synchrotron
Issue Date: 2013
Publisher: © Elsevier Masson SAS
Citation: NORMAN, R.L. ... et al, 2013. Synthesis and structural characterisation of new ettringite and thaumasite type phases: Ca6[Ga(OH)6•12H2O]2(SO4)3•2H2O and Ca6[M(OH)6•12H2O]2(SO4)2(CO3)2, M = Mn, Sn. Solid State Sciences, 25, pp.110-117.
Abstract: Investigations into the formation of new ettringite-type phases with a range of trivalent and tetravalent cations were carried out to further study the potential this structure type has to incorporate cations covering a range of ionic radii (0.53–0.69 Å). We report the synthesis and structural characterisation of a new ettringite-type phase, Ca6[Ga(OH)6•12H2O]2(SO4)3•2H2O, which was indexed in space group P31c with the unit cell parameters a = 11.202(2) Å, c = 21.797(3) Å and two new thaumasite-type phases Ca6[M(OH)6•12H2O]2(SO4)2(CO3)2, M = Mn, Sn which were indexed in space group P63 with the unit cell parameters a = 11.071(5) Å, c = 21.156(8) Å and a = 11.066(1) Å, c = 22.420(1) Å respectively. These new phases show the versatility of the ettringite family of structures to tolerate a large range of cation sizes on the octahedral M site and highlights the preference of tetravalent cations to crystallise with the thaumasite structure over the ettringite structure.
Description: NOTICE: this is the author’s version of a work that was accepted for publication in Solid State Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published at: http://dx.doi.org/10.1016/j.solidstatesciences.2013.08.006
Sponsor: CK would like to acknowledge financial support from The Natural History Museum and WestChem.
Version: Accepted for publication
DOI: 10.1016/j.solidstatesciences.2013.08.006
URI: https://dspace.lboro.ac.uk/2134/15387
Publisher Link: http://dx.doi.org/10.1016/j.solidstatesciences.2013.08.006
ISSN: 1293-2558
Appears in Collections:Published Articles (Chemistry)

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