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PARAMAGNETIC RESONANCE ABSORPTION OF GAMMA IRRADIATED SYNTHETIC ZEOLITES

Author
Stamires, D. N.
Published
United States : [publisher not identified], 1963.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1963.
Physical Description
microfiche : negative ; 8 x 13 cm
Additional Creators
Turkevich, J.

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Summary
The effect of gamma irradiation of synthetic zeolites was studied. Sodium X and sodium Y zeolites and also decationated samples prepared from these were irradiated in vacuum at room temperature with doses up to 20 megaroentgens. Two types of EPR signals were obtained. For the sodium Y and the sodium X zeolite a single line signal X/subv 1/ was found. It was 38.4 gauss wide with g = 2.0200 indicating that it is a hole; its intensity followed the Curie law. Heating above 350 deg C caused the signal to disappear. The signal was decreased by oxygen gas but the effect was reversible. Saturation does not take place with irradiation up to 14 megaroentgens. A pink coloration was also produced, but its behavior did not parallel that of the Xi signal. For the decationated Y zeolite a six lined EPR signal was obtained by radiation. The separation between the lines was 5 gauss and the center of this signal was at g = 2.0017. Its intensity was independent of temperature, and the signal annealed at about 500 deg C. The signal is not affected by oxygen and its intensity satunates at an exposure of 3 megaroentgens; no coloration was observed. For partially decationated sites both X/sub 1/ and X/sub 2/ signals were observed. The X/sub 1/ signal is interpreted to be a hole located on the oxygen of the lattice, while the X/sub 2/ is assumed to be due to an electron located near the Al nucleus that was decationated. (auth)
Report Numbers
NYO-10593
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: AT(30-1)-1158
NSA number: NSA-17-036348
OSTI Identifier 4651054
Research organization: Princeton Univ., N.J. Frick Chemical Lab.
View MARC record | catkey: 41982185