Control on arrangement of AgI clusters incorporated into zeolite LTA
Nanoarchitectonics Research Center, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba central 5, Tsukuba, Ibaraki 305-8565, Japan
2 Laboratory for Membrane Chemistry, National Institute of Advanced Industrial Science and Technology, AIST Tohoku, Sendai, Miyagi 983-8551, Japan
Corresponding author: a firstname.lastname@example.org
Published online: 3 July 2003
AgI clusters were incorporated into Li, Na, and K-form LTA zeolites with a loading number of four AgI molecules per α-cage. The X-ray powder diffraction (XRD) patterns and optical absorption spectra of the samples were obtained. The XRD patterns indicate that the sizes of the clusters and their arrangements depend on the type of alkali-cations. AgI clusters with different sizes, i.e., (AgI) and (AgI) , are arrayed alternatively in Na-form LTA conforming to the space group of P23. AgI-loaded Li-form LTA also conformed to the space group of P23, although (AgI) clusters seem to be distributed disorderly. On the contrary, (AgI) cluster is in each cage in K-form LTA conforming to the space group of Fmc or F3c. The optical spectra showed that Li and Na-form LTAs include (AgI) , and that K-form LTA includes (AgI) cluster in each cage.
PACS: 82.75.Vx – Clusters in zeolites / 61.10.Nz – X-ray diffraction
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003