Structure of selenium and tellurium clusters in cavities of NaX zeolite

The structure of NaX zeolite crystals with the Se and Te atoms incorporated into the structure from their vapors has been studied. It is shown that se lenium atoms form clusters in the shape of six- and four-membered rings loc ated in the cuboctahedral cavities of the structure framework. Single Se-2 molecules are located in large cavities, whereas Te atoms form four-membere d rings located in cuboctahedra. Large cavities are occupied by two alterna ting configurations of Te atoms forming either a chain consisting of 16 lin ks or an eight-membered ring. (C) 2000 MAIK "Nauka/Interperiodica".