Synthesis and structural characterisation of new ettringite and thaumasite type phases: Ca-6[Ga(OH)(6)center dot 12H(2)O](2)(SO4)(3)center dot 2H(2)O and Ca-6[M(OH)(6)center dot 12H(2)O](2)(SO4)(2)(CO3)(2), M = Mn, Sn

Rachel L. Norman, Sandra E. Dann, Simon C. Hogg, Caroline A. Kirk*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 angstrom). We report the synthesis and structural characterisation of a new ettringite-type phase, Ca-6[Ga(OH)(6)center dot 12H(2)O](2)(SO4)(3)center dot 2H(2)O, which was indexed in space group P31c with the unit cell parameters a = 11.202(2) angstrom, c = 21.797(3) angstrom and two new thaumasite-type phases Ca-6[M(OH)(6)center dot 12H(2)O](2)(SO4)(2)(CO3)(2), M = Mn, Sn which were indexed in space group P63 with the unit cell parameters a = 11.071(5) angstrom, c = 21.156(8) angstrom and a = 11.066(1) angstrom, c = 22.420(1) angstrom 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. (C) 2013 Elsevier Masson SAS. All rights reserved.

Original languageEnglish
Pages (from-to)110-117
Number of pages8
JournalSolid state sciences
Volume25
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Ettringite
  • Thaumasite
  • X-ray diffraction
  • Synchrotron
  • CRYSTAL STRUCTURE
  • SOLID-SOLUTION
  • CA6AL2(SO4)(3)(OH)(12)CENTER-DOT-26H(2)O
  • 3CAO.AL2O3.3CASO4.32H2O

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