Abstract
Synthetic expandable fluorine mica having layer charge of 0.5 [Na0.5Mg2.5Li0.5Si4O10F2] was reacted with concentrated hydroxoaluminum solution containing highly polymerized species of hydroxoaluminum polycations, which had six or eighteen times larger volumes than ordinary Al13-polycation having Keggin structure. Thermal durability of the complexes thus obtained from concentrated hydroxoaluminum solution was higher than that obtained from ordinary Ai13-polycation while microporous characters vanished for the former complexes, e., alumina pillared fluorine micas. The increase in thermal durability and vanishment of microporous characters probably resulted from the stuffed structure of intercalated bulky hydroxoaluminum polycations having larger polymerization degree as well as the highest value of intercalated Al-content of 2.30 mol/Si4O10.
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