Citation: Song, S.H.; Seff, K.; Kim, Y. (1991). Formation of hexasilver at the center of the large cavity. Three crystal structures of dehydrated Ag+- and Ca2+ -exchanged zeolite A, Ag(12-2x) Ca(x)-A (x=2,3 and 4) treated with rubidium vapor. Journal of Physical Chemistry, 95, pp. 9919-9924.