POSITIONS OF CATIONS AND MOLECULES IN ZEOLITES WITH FAUJASTITE-TYPE FRAMEWORK .4. DEHYDRATED LA-EXCHANGED FAUJASITE

The crystal structure of dehydrated La-exchanged faujasite at 420°C is almost identical in all respects with that at room temperature, thus indicating that the cation positions are essentially independent of temperature so long as the chemical composition is held constant. The La atom is again displaced along the triad axis suggesting preferred bonding to three 0(3). The 0(2) atoms are strongly displaced along the direction of the La atom. Perhaps these properties may produce a domain structure which might be ferro-electric. © 1969.