High-Frequency Dielectric Properties of Nanocomposite and Ceramic Titanates


A group of ferroelectric and connected titanate ceramics and nanocomposites were prepared and their dielectric and electromagnetic properties were studied in a very broad frequency range, as well as microwave, millimeter-wave and THz frequencies. Dielectric and conductivity spectra of the opal-matrix nanocomposites were typical for conductor–dielectric composites and may be described by Cole–Cole relaxations and Drude conductivity. The highest values of microwave dielectric permittivity, losses and conductivity were observed within the composite with nanoparticles. Absorption properties of ceramic and some composite titanates were measured and estimated within the microwave vary. Some of the studied compositions were found to be interesting for development of microwave absorbing or shielding materials.

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