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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

DOI: 10.1016/j.solidstatesciences.2013.08.006 DOI Help

Authors: Rachel Norman (University of Loughborough) , Sandra E. Dann (Loughborough University) , Simon Hogg (Loughborough University) , Caroline Kirk (University of Loughborough)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Solid State Sciences

State: Published (Approved)
Published: August 2013

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.

Journal Keywords: Ettringite; Thaumasite; X-Ray Diffraction; Synchrotron

Subject Areas: Materials, Chemistry

Instruments: I11-High Resolution Powder Diffraction

Added On: 28/08/2013 10:25

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