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Paraelectric ceramics/metal dual composites SrTiO3/Pt system with giant relative permittivity

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4 Author(s)
Cho, Won Woo ; Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan ; Kagomiya, I. ; Kakimoto, Ken-ichi ; Ohsato, Hitoshi

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Dielectric properties of SrTiO3Pt (platinum) composites prepared using conventional ceramic method were investigated. Dense complex ceramics were obtained without chemical reaction between SrTiO3 and Pt during sintering processes. The relative permittivity r) of SrTiO3 was increased by the addition of Pt particles nearly up to the percolation threshold of 27.8 vol % as predicted using normalized percolation theory. The maximum εr of 2150 at 1 MHz was obtained for the composite including 27 vol % Pt due to the increased electric field around Pt particles. Using finite difference time domain method, the increase of electric field in the direction of applied electric field was confirmed visually in the vicinity of the embedded metal particles.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 15 )

Date of Publication:

Oct 2006

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