TY - JOUR
T1 - The effect of calcium on phase formation in the sodium aluminium silicate carbonate system and the structure of NaCaSiO3OH
AU - Kenyon, N.J.
AU - Weller, M.T.
PY - 2003/5/19
Y1 - 2003/5/19
N2 - The effect of calcium on the hydrothermal syntheses of aluminosilicate frameworks in the presence of carbonate at 150 and 220 °C has been studied. Under calcium-free conditions the formation of the cancrinite framework (220 °C), [Na8(CO3) · (H2O)n][AlSiO4]6––CAN, and a disordered cancrinite/sodalite intergrowth (150 °C) are observed in agreement with the literature. Addition of calcium to the synthesis media results in its incorporation into these framework structures to give [NaxCay(CO3){x+2y−6}/2(H2O)n][AlSiO4]6––CAN, as evidenced by decreases in the cell volumes and EDAX analysis. At high concentrations of calcium a new phase, NaCaSiO3OH, forms and the structure of this material, which contains ordered strongly hydrogen-bonded SiO3OH units, has been defined using neutron diffraction.
AB - The effect of calcium on the hydrothermal syntheses of aluminosilicate frameworks in the presence of carbonate at 150 and 220 °C has been studied. Under calcium-free conditions the formation of the cancrinite framework (220 °C), [Na8(CO3) · (H2O)n][AlSiO4]6––CAN, and a disordered cancrinite/sodalite intergrowth (150 °C) are observed in agreement with the literature. Addition of calcium to the synthesis media results in its incorporation into these framework structures to give [NaxCay(CO3){x+2y−6}/2(H2O)n][AlSiO4]6––CAN, as evidenced by decreases in the cell volumes and EDAX analysis. At high concentrations of calcium a new phase, NaCaSiO3OH, forms and the structure of this material, which contains ordered strongly hydrogen-bonded SiO3OH units, has been defined using neutron diffraction.
UR - http://www.scopus.com/inward/record.url?scp=0037900972&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1016/S1387-1811(03)00310-X
U2 - 10.1016/S1387-1811(03)00310-X
DO - 10.1016/S1387-1811(03)00310-X
M3 - Article
AN - SCOPUS:0037900972
SN - 1387-1811
VL - 59
SP - 185
EP - 194
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 2-3
ER -