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Default Solid State Field-Cycling NMR Relaxometry: Instrumental Improvements and New Applications

Solid State Field-Cycling NMR Relaxometry: Instrumental Improvements and New Applications


Publication date: Available online 28 September 2014
Source:Progress in Nuclear Magnetic Resonance Spectroscopy

Author(s): Franz Fujara , Danuta Kruk , Alexei F. Privalov

The paper reviews recent progress in field cycling (FC) NMR instrumentation and its application to solid state physics. Special emphasis is put on our own work during the last 15 years on instrumentation, theory and applications. As far as instrumentation is concerned we report on our development of two types of electronical FC relaxometers, a mechanical FC relaxometer and a combination of FC and one-dimensional microimaging. Progress has been achieved with respect to several parameters such as the accessible field and temperature range as well as the incorporation of sample spinning. Since an appropriate analysis of FC data requires a careful consideration of relaxation theory, we include a theory section discussing the most relevant aspects of relaxation in solids which are related to prevailing residual dipolar and quadrupolar interactions. The most important limitations of relaxation theory are also discussed. With improved instrumentation and with the help of relaxation theory we get access to interesting new applications such as ionic motion in solid electrolytes, structure determination in molecular crystals, ultraslow polymer dynamics and rotational resonance phenomena.
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