Silver nitrate in silver zeolite A: three-dimensional incommensurate guest ordering in a zeolite framework
2006 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, no 19, 2368-2373 p.Article in journal (Refereed) Published
We report the results of a detailed examination of the occlusion of silver nitrate in silver zeolite A (AgA). The superlattice reported to occur in (AgNO3)(9) - AgA was found to melt at between 80 and 100 degrees C on heating and reappear when the sample was cooled down to 80 degrees C. Annealing in this temperature range and rigorous exclusion of water produced an enhancement of the superlattice peaks, which results from ordering of the contents of the zeolite cages. Peaks assigned to the superlattice were indexed with the tetragonal lattice parameters a = 17.440( 5) and c = 12.398( 4) angstrom and proposed space group P4/nmm. The sharp peaks representing the lattice of the framework ( a = 12.3711( 5) angstrom, Pm (3) over barm) remained largely unaffected by the guest in this compound, which was found to exhibit strong negative thermal expansion. The host and guest lattices are incommensurate with the tetragonal guest lattice being slightly larger than the cubic host in the c-direction and slightly smaller in the a- and b-directions.
Place, publisher, year, edition, pages
2006. no 19, 2368-2373 p.
crystal-structure, inclusion, clusters, lta, diffraction, nanowires
IdentifiersURN: urn:nbn:se:kth:diva-15666DOI: 10.1039/b517094jISI: 000237462000012ScopusID: 2-s2.0-33646693610OAI: oai:DiVA.org:kth-15666DiVA: diva2:333708
QC 201005252010-08-052010-08-05Bibliographically approved