%0 Journal Article %A Norman, Rachel L. %A Dann, Sandie %A Hogg, Simon %A Kirk, Caroline %D 2014 %T 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 %U https://repository.lboro.ac.uk/articles/journal_contribution/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/9391193 %2 https://repository.lboro.ac.uk/ndownloader/files/17004725 %K Ettringite %K Thaumasite %K X-ray diffraction %K Synchrotron %K Chemical Sciences not elsewhere classified %K Inorganic Chemistry %K Condensed Matter Physics %X 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. %I Loughborough University