79,81 Br and 133 Cs Nuclei Quadrupole Interactions and Phase Transitions in Crystalline Caesium Perbromate

NMR experiments in solid caesium perbromate have recently been performed at magnetic fields of 1.88 T and 7.04 T together with spectral simulations for 79 Br, 81 Br and 133 Cs in solid caesium perbromate. The line shapes are dominated by quadrupole effects. For bromine the quadrupole asymmetry param...

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Published inZeitschrift für Naturforschung. B, A journal of chemical sciences Vol. 45; no. 7; pp. 1005 - 1009
Main Authors Tarasov, V. P., Privalov, V. I., Buslaev, Yu. A., Eichhoff, U.
Format Journal Article
LanguageEnglish
Published 01.07.1990
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Summary:NMR experiments in solid caesium perbromate have recently been performed at magnetic fields of 1.88 T and 7.04 T together with spectral simulations for 79 Br, 81 Br and 133 Cs in solid caesium perbromate. The line shapes are dominated by quadrupole effects. For bromine the quadrupole asymmetry parameter [η] is observed to be zero at all temperatures while the quadrupole coupling constant (C Q ) as a function of temperature shows two approximately linear regions on either side of a non-linear region between 200 K and 260 K where an extended orientational phase transition occurs. 133 Cs shows an increase of C Q and a decrease of η with increasing temperature. This behaviour may be associated with an anisotropic change of the “a” lattice parameter.
ISSN:0932-0776
1865-7117
DOI:10.1515/znb-1990-0716