Dielectric and Ferroelectric Properties of BaTiO3/Ni Cermets Under High Electric Fields

Author: Jiménez Ricardo   Esteban-Betegón Fátima   Pecharromán Carlos   Moya José S.   Alemany Carlos  

Publisher: Taylor & Francis Ltd

ISSN: 0015-0193

Source: Ferroelectrics, Vol.268, Iss.1, 2002-01, pp. : 387-392

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Abstract

Dielectric properties of ferroelectric-ceramic/metal exhibit extraordinary high values of effective dielectric permittivity. We have prepared BT/Ni ceramics with Ni composition from f = 0 to f = 0.3 and we have studied the dependence of its dielectric permittivity, and its ferroelectric properties under high electric fields. In these composites, the ferroelectric character of the matrix is strongly modified by the metallic particles as a consequence of the large increase of linear dielectric permittivity while the non-linear part remains nearly unchanged. In samples with low or moderate nickel content, ferroelectric switching still can be detected. Samples with Ni concentrations close to the percolation threshold which have giant linear dielectric permittivity, become paraelectric. In these latter, leakage current also plays an important role.

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