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Uniaxial stress dependence of the dielectric properties in the Na0.5Bi0.5TiO3–NaTaO3 system

Published online by Cambridge University Press:  31 January 2011

Jakob König ,
Matjaž Spreitzer ,
Boštjan Jančar ,
Julian Tolchard ,
Mari-Ann Einarsrud  and
Danilo Suvorov
Boštjan Jančar
Affiliation:
Advanced Materials Department, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia
Mari-Ann Einarsrud
Affiliation:
Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Danilo Suvorov
Affiliation:
Advanced Materials Department, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia
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Abstract

The dependence of the dielectric properties on the uniaxial compressive stress and the stress-strain properties was investigated for the case of (1-x)Na0.5Bi0.5TiO3–xNaTaO3 ceramics. Special attention was focused on the time component and the reversibility of the permittivity–stress dependence. The results were interpreted according to the samples' polar and symmetry states and the ferroelasticity. The time dependence and irreversible changes of the dielectric properties were connected with the domain structure of the materials, which is modified under the applied stress. The irreversible changes observed in the macroscopically nonferroelectric compositions were related to the ferroelastic properties. The stress sensitivity increased with the addition of NaTaO3 from 3% in pure Na0.5Bi0.5TiO3 to 14% in the sample with 15 mol% of NaTaO3 (at 200 MPa and 1 MHz). The reversibility was improved by mechanical modification of the samples' domain state, while the dielectric response remained time dependent.

Keywords

Dielectric propertiesStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 9 , September 2010 , pp. 1784 - 1792
Copyright
Copyright © Materials Research Society 2010

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