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Infrared and THz spectroscopy of nanostructured dielectrics

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Author(s): Jan Petzelt

Journal: Processing and Application of Ceramics
ISSN 1820-6131

Volume: 3;
Issue: 3;
Start page: 145;
Date: 2009;
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Keywords: Infrared and THz spectroscopy | Effective medium approximation | Nanostructured ferroelectrics

ABSTRACT
Results achieved using the infrared/THz spectroscopy of various inhomogeneous dielectrics in the Department of Dielectrics, Institute of Physics, Prague, during the last decade are briefly reviewed. The discussion concerns high-permittivity ceramics with inevitable low-permittivity dead layers along the grain boundaries, relaxor ferroelectrics with highly anisotropic polar nano-regions, classical matrix-type composites, core-shell composites, filled nanoporous glasses, polycrystalline and epitaxial thin films, heterostructures and superlattices on dielectric substrates. The analysis using models based on the effective medium approach is discussed. The importance of depolarizing field and of the percolation of components on the effective ac dielectric response and the excitations contributing to it are emphasized.
Affiliate Program     

Tango Jona
Tangokurs Rapperswil-Jona