TY - JOUR
T1 - Bulk modulus of basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, a possible zeolitic precursor in coal-fly-ash-based geopolymers
AU - Oh, Jae Eun
AU - Moon, Juhyuk
AU - Mancio, Mauricio
AU - Clark, Simon M.
AU - Monteiro, Paulo J M
PY - 2011/1
Y1 - 2011/1
N2 - Synthetic basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, cubic, P43n, (also known as hydroxysodalite hydrate) was prepared by the alkaline activation of amorphous aluminosilicate glass, obtained from the phase separation of Class F fly ash. The sample was subjected to a process similar to geopolymerization, using high concentrations of a NaOH solution at 90 °C for 24 hours. Basic sodalite was chosen as a representative analogue of the zeolite precursor existing in Na-based Class F fly ash geopolymers. To determine its bulk modulus, high-pressure synchrotron X-ray powder diffraction was applied using a diamond anvil cell (DAC) up to a pressure of 4.5 GPa. A curve-fit with a truncated third-order Birch-Murnaghan equation of state with a fixed K'o = 4 to pressure-normalized volume data yielded the isothermal bulk modulus, K o = 43 ± 4 GPa, indicating that basic sodalite is more compressible than sodalite, possibly due to a difference in interactions between the framework host and the guest molecules.
AB - Synthetic basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, cubic, P43n, (also known as hydroxysodalite hydrate) was prepared by the alkaline activation of amorphous aluminosilicate glass, obtained from the phase separation of Class F fly ash. The sample was subjected to a process similar to geopolymerization, using high concentrations of a NaOH solution at 90 °C for 24 hours. Basic sodalite was chosen as a representative analogue of the zeolite precursor existing in Na-based Class F fly ash geopolymers. To determine its bulk modulus, high-pressure synchrotron X-ray powder diffraction was applied using a diamond anvil cell (DAC) up to a pressure of 4.5 GPa. A curve-fit with a truncated third-order Birch-Murnaghan equation of state with a fixed K'o = 4 to pressure-normalized volume data yielded the isothermal bulk modulus, K o = 43 ± 4 GPa, indicating that basic sodalite is more compressible than sodalite, possibly due to a difference in interactions between the framework host and the guest molecules.
UR - http://www.scopus.com/inward/record.url?scp=78649334449&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2010.09.012
DO - 10.1016/j.cemconres.2010.09.012
M3 - Article
AN - SCOPUS:78649334449
VL - 41
SP - 107
EP - 112
JO - Cement and Concrete Research
JF - Cement and Concrete Research
SN - 0008-8846
IS - 1
ER -