Abstract
Potassium clusters stabilized in regular cages of aluminosilicate zeolite LTA are investigated in detail in term of structure as well as magnetic properties. A ferromagnetic properties have been observed when more than two potassium atoms are adsorbed into each α cage of LTA. When the average number of adsorbed K metal exceeds two atoms per α cage, new diffraction lines are observed at the forbidden indices of original framework structure of LTA. The crystal structure is well analyzed by the space group F23 with a larger unit cell. The origin of the forbidden diffraction lines is assigned to the superstructure of two different potassium clusters stabilized periodically in adjacent α cages. Most of adsorbed K atoms occupy the side positions of 4-membered rings in the α cage. The periodic difference of their occupancy is main origin of the superstructure reflection. At higher densities of K adsorption, an atom occupies one of the centers of clusters. A discussion is given for the relation between the structure and the magnetic properties.
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