This article is cited in 1 paper

Dielectrics

Nuclear quadrupole resonance and thermally activated molecular mobility in solids: Reorientations of symmetric molecular species and pseudorotation in trigonal-bipyramidal molecules

I. A. Kyuntsel, V. A. Mokeeva

Perm State National Research University

Abstract: The specific features revealed in the behavior of temperature dependences of the spin-lattice relaxation time $t_1$ of quadrupole nuclei involved in different types of thermally activated motions in crystals have been analyzed under the assumption that there exists a temperature dependence of the activation energy of motion. An expression for the spin-lattice relaxation rate has been obtained. This expression includes the effect under consideration and provides an adequate explanation for numerous anomalies in the behavior of the experimental dependences $t_1(T)$, which were revealed in the case of the motion of molecular fragments with a relatively large volume. A nontraditional method for evaluating the activation energy of motion under these conditions has been proposed.

Received: 27.12.2010

 English version: Physics of the Solid State, 2011, 53:7, 1315–1321

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