SYNTHESIS OF Al, Fe-FERRIERITE SOLID SOLUTION

概要

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The synthesis of Al, Fe-ferrierite solid solution was carried out at 150℃ using tetramethylammonium hydroxide as a template, and the continuous solid solutions in the range of 0.55 to 1.00 for Fe_2O_3/(Al_2O_3+Fe_2O_3) molar fraction of gel was obtained. The Al end-member was also synthesized, but in the range between 0 and 0.55 for Fe_2O_3/ (Al_2O_3+Fe_2O_3) molar fraction of gel a small amount of mordenite coexisted with ferrierite. The Fe end-member contained a minute quantity of alumina which came from alumina present in a silica source, and hence the solid solutions were contaminated with the impurity. They show pale brown color, and do not contain ferrous ions. Two kinds of crystal habits were observed in the solid solution : one is platy crystals and the other spherical aggregates of radiating blades. The lattice constants a, b and c of the solid solutions increased with increasing Fe content due to the difference between ionic radii of Fe^<3+> and Al^<3+>, and the a-axis varied markedly. The lattice constants a, b and c for the Al and Fe end-members are 19.04,14.19 and 7.53 Å, and 19.20,14.23,7.55 Å, respectively.
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