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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Moon, Juhyuk
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Publications (5/5 displayed)
- 2020Pressure-induced anomalous behavior of thaumasite crystalcitations
- 2019Effect of volcanic ash pozzolan or limestone replacement on hydration of Portland cementcitations
- 2013Determination of the elastic properties of amorphous materialscitations
- 2012Elastic properties of tricalcium aluminate from high-pressure experiments and first-principles calculationscitations
- 2011Bulk modulus of basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, a possible zeolitic precursor in coal-fly-ash-based geopolymerscitations
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article
Bulk modulus of basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, a possible zeolitic precursor in coal-fly-ash-based geopolymers
Abstract
<p>Synthetic basic sodalite, Na<sub>8</sub>[AlSiO<sub>4</sub>] <sub>6</sub>(OH)<sub>2</sub>•2H<sub>2</sub>O, 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'<sub>o</sub> = 4 to pressure-normalized volume data yielded the isothermal bulk modulus, K <sub>o</sub> = 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.</p>