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

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 acti...

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Bibliographic Details
Published in:Physics of the solid state 2011-07, Vol.53 (7), p.1315-1321
Main Authors: Kyuntsel’, I. A., Mokeeva, V. A.
Format: Article
Language:English
Subjects:
Activation energy
Analysis
Dielectrics
Physics
Physics and Astronomy
Solid State Physics
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Summary: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.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783411070195