Abstract
Temperature dependences of 14N NQR frequency and spin-lattice relaxation time ( T 1) have been investigated in a mixed system [(CH 2) 6N 4] 1− x [KNO 2] x . From T 1 measurement, the activation energy ( E a ) on reorientational motion above 270 K in the pure (CH 2) 6N 4 is determined to be E a =15.1 kcal mole −1, in agreement with a previous report. The E a determined in the mixed system [(CH 2) 6N 4] 1− x [KNO 2] x with x=0.06, 0.13 and 0.24 are found to be 16.6±1.0, 22.1±1.6 and 32.5±3.2 kcal mol −1, respectively. The increase of E a in the mixed system compared to that in the pure (CH 2) 6N 4 implies that introducing KNO 2 impurity in the (CH 2) 6N 4 matrix causes an increase of the potential barrier of the reorientational motion in (CH 2) 6N 4 leading to the suppression of the motion.
Published Version
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