Pure Na-4-mica: Synthesis and characterization

Man Park, Dong Hoon Lee, Choong Lyeal Choi, Sang Soo Kim, Kwang Seop Kim, Jyung Choi

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


An innovative synthesis method for phase-pure Na-4-mica has been developed in this study. Phase pure Na-4-mica has been synthesized by using NaCl melt. In the newly develope]d method, not only could the postpreparation process be avoided but also the crystal size could be manipulated in the range of about 2-5 μm by the initial molar ratio of Al2O3/NaCl. Both the hydrated and anhydrous Na-4-mica phases possess monoclinic crystal systems with the same layer plane. The X-ray diffraction (XRD) patterns exhibited relatively strong h0l peaks along with very strong 00l peaks. Changes in the cell parameters of β and c on hydration-dehydration indicate that the layer swelling is accompanied with a significant parallel displacement of layers. Furthermore, pure Na-4-mica has exhibited completely reversible dehydration-rehydration behavior up to 800°C and extremely high Sr2+ uptake capacity without any layer collapse.

Original languageEnglish
Pages (from-to)2582-2589
Number of pages8
JournalChemistry of Materials
Issue number6
StatePublished - 2002


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