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Observation of dielectric dispersion of BaTiO3 ceramics in the gigahertz frequency region by scattering parameter measurement using a pair of surface electrodes

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2 Author(s)
Nakayama, A. ; Research and Development Center, Kyocera Corporation, Kokubu Yamashita-cho, Kirishima-shi, Kagoshima 899-4312, Japan ; Yoshikawa, H.

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A measurement method is proposed for observing dielectric dispersion of ferroelectric ceramics in the gigahertz region. This method is based on scattering parameter (S11) measurements using a pair of electrodes. Using this method, relaxation-type dielectric dispersion of BaTiO3 ceramics is observed in the range from 100 MHz to 20 GHz. The relaxation frequency shifts to lower frequencies with larger grain size. In coarse-grain BaTiO3 ceramics, two peaks of the imaginary part of permittivity are observed, depending on the amount of time after thermal treatment. The contribution of the ferroelectric domain and ionic vibration to the dielectric dispersion is discussed.

Published in:
Applied Physics Letters  (Volume:95 ,  Issue: 7 )

Date of Publication: Aug 2009

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