Volume 66, Number 4, May 2004
|Page(s)||520 - 526|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 May 2004|
Aging of the asymmetry induced by the biasing electric field in a disordered ferroelectric
Laboratoire des Milieux Désordonnés et Hétérogènes (UMR CNRS 7603), Université Pierre et Marie Curie (case 86) 75252 Paris cedex 05, France
Accepted: 8 March 2004
Isothermal aging of the disordered dielectric crystal x (), the symmetry of which is broken by the biasing electric field , is studied by means of AC dielectric-constant measurements. The asymmetry of the crystal induced by the field is put in evidence by the response of the dielectric constant to the small field change . This response contains an anisotropic contribution proportional to and an isotropic positive contribution proportional to . The former slowly decreases whereas the latter increases as time elapses. Our results are well interpreted in the framework of a model which attributes the time-dependent part of the dielectric constant to the evolution of the polarization domain walls: the slow decrease (aging) of the linear contribution is related to the decrease of the total wall area, which is a consequence of the domain growth, while the fast increase (rejuvenation) of the quadratic contribution is the signature of wall reconformations.
PACS: 61.43.-j – Disordered solids / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, 2004
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