23Na quadrupolar and dielectric relaxation study on dynamics and metastability in (K-Na)TaO3
- 24 November 1983
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 16 (33) , 6321-6328
- https://doi.org/10.1088/0022-3719/16/33/005
Abstract
23Na quadrupolar spin-lattice relaxation and dielectric dispersion data are reported for mixed crystals (K-Na)TaO3. Below 150K, the Na ions are shown to associate a dipole moment of 0.04 AA e-, which changes orientations among equivalent (100) directions. This hopping motion contributes to both dielectric and spin-lattice quadrupolar relaxation, thus allowing evaluation of the dipole reorientation rates. These appear to be widely distributed and, in particular at low temperature, their low-frequency tail is likely to prevent the thermodynamical equilibrium state being reached in experimental times. Some dynamics of resonant character is observed at 4K.Keywords
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