The structure of dehydrated zeolite 3A (Si/Al=1. 01) by neutron profile refinement

Journal Article · Fri Apr 01 04:00:00 EST 1983 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(83)90001-4· OSTI ID:5609353

Adams, J M; Haselden, D A

A neutron powder diffraction study of a dehydrated commercially available potassium exchanged zeolite A (Linde 3A) has shown that the diffraction pattern can be indexed in cubic space group Fm3c. For this sample there is 63% exchange of potassium for sodium (K/sup +//Na/sup +/=1.69). Data collected at a neutron wavelength of 2.98 angstrom shows no evidence of rhombohedral distortion and suggests that the assignment of space group Fm3c is correct. The final structural model is closely analogous to that found for dehydrated sodium zeolite A. Unusual features of previous refinements of potassium containing zeolite A samples, i.e., ''zero coordinate'' cations or potassium inside the ..beta..-cage have not been found . Refinements using the same 1.9 angstrom neutron powder diffraction data were also obtained with the models of Leung et al. and Pluth and Smith (1979) as starting points (denoted LKSM and PS, respectively) and comparison is made with these. The final R factors for the three refinements were R/sub pw/=10.24% for the model presented here, R/sub pw/=10.38% (PS model), and R/sub pw/=10.61% (LKSM model).

• Research Organization: University College of Wales, Aberystwyth
• OSTI ID: 5609353
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 47:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALKALI METALS
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DIFFRACTION
ELEMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
NEUTRON DIFFRACTION
POTASSIUM
SCATTERING
SODIUM
ZEOLITES