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Phase transition kinetics and reorientational dynamics of the plastic crystal meta-carborane studied by deuteron NMR

MPG-Autoren
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Zimmermann,  Herbert
Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Zitation

Winterlich, M., Zimmermann, H., & Böhmer, R. (2002). Phase transition kinetics and reorientational dynamics of the plastic crystal meta-carborane studied by deuteron NMR. Journal of Non-Crystalline Solids, 307-310, 442-448. doi:10.1016/S0022-3093(02)01506-5.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0029-7D6D-B
Zusammenfassung
Meta-carborane shows an orientationally disordered, orthorhombic phase which transforms into an ordered monoclinic phase near 170 K and into a quasi-isotropic cubic phase near 280 K. From deuteron magnetization measurements both transitions are found to exhibit a thermal hysteresis and slow transformation kinetics. Furthermore, solid-echo NMR spectra and spin-lattice relaxation times are reported. These results indicate that in the orthorhombic phase the meta-carborane molecules perform a strongly anisotropic motion which is characterized by a temperature dependent amplitude.