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Positron Annihilation Studies of the Internal Surfaces of Selected Zeolites and the Effect of Hydration
Author(s) -
Surapanani Srinivas,
Mullins Michael E.,
Waber James T.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03782.x
Subject(s) - positron annihilation , annihilation , amorphous solid , positron , amorphous silica , materials science , intensity (physics) , zeolite , volume (thermodynamics) , analytical chemistry (journal) , mineralogy , chemistry , nuclear physics , thermodynamics , physics , optics , crystallography , chemical engineering , chromatography , electron , biochemistry , engineering , catalysis
Positron annihilation techniques have been applied to study the pore diameters and volumes of 11 crystalline and amorphous zeolites. The data, consisting of the number of counts per channel recorded on a multichannel analyzer, were analyzed by means of the POSITRONFIT program. The data were presented as four lifetimes, τ 1 to τ 4 , with their associated intensities, I 1 to I 4 . The pore volumes reported here were based on a quantum mechanical model. The derived volumes are in reasonable agreement with pore volumes obtained with X‐ray and other data. The intensity of our fourth positron lifetime correlates with Brunauer–Emmett–Teller measurements of the surface area of the powders. These results are consistent with two studies by other authors.