9 GHZ CW-EPR STUDY OF A PHASE-TRANSITION IN GAMMA-IRRADIATED DCA-PIPERIDINE

Authors
KRZYMINIEWSKI R BIELEWICZ A KUDYNSKA J BUCKMASTER HA BRYCKI B
Citation
R. Krzyminiewski et al., 9 GHZ CW-EPR STUDY OF A PHASE-TRANSITION IN GAMMA-IRRADIATED DCA-PIPERIDINE, Physica. B, Condensed matter, 239(3-4), 1997, pp. 293-298
Citations number
29
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica. B, Condensed matter → ACNP
ISSN journal
09214526
Volume
239
Issue
3-4
Year of publication
1997
Pages
293 - 298
Database
ISI
SICI code
0921-4526(1997)239:3-4<293:9GCSOA>2.0.ZU;2-#
Abstract
The 9.4 GHz CW-EPR of gamma-irradiated DCA-piperidine has been studied from 123 to 293 K. It was found that the hyperfine splitting (HFS) re sonance line width varied with the temperature and exhibited anomalous behaviour near 204 K indicative of a structural phase transition. It is suggested that this behaviour may be due to the effect of the proto n dynamics on the spin-lattice relaxation time. It was also found that the total HFS decreased from 9.70(6) to 9.20(6) mT in the temperature interval from 263 to 163 K.