STRUCTURE AND ELECTRONIC-PROPERTIES OF POTASSIUM-LOADED ZEOLITE-L

The structure, electron spin resonance, and electrical properties of p otassium-loaded zeolite L have been studied asa function of metal load ing up to a concentration of nine additional potassium atoms per unit cell. The incorporation of extra potassium into the dehydrated zeolite resulted in an increase in the room-temperature conductivity by a fac tor of 10 000 at the highest loading level. The strong temperature dep endence of the measured electrical conductivities indicates that the c onduction process is thermally activated throughout the composition ra nge investigated. In accordance with theoretical predictions by M. J. Kelly, our measurements indicate that any anisotropy in the conductivi ty must be relatively modest. The role in the conduction mechanism of new K-3(p+) clusters located in the one-dimensional channels is discus sed.