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Electrostrictive effect in lead-free relaxor K0.5Na0.5NbO3SrTiO3 ceramic system

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6 Author(s)
Bobnar, V. ; Jožef Stefan Institute, P.O. Box 3000, Ljubljana SI-1001, Slovenia ; Malic, B. ; Holc, J. ; Kosec, M.
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The elastic strain of lead-free relaxor K0.5Na0.5NbO3SrTiO3 ceramic system, induced by applied electric fields with amplitudes up to 40 kV/cm, has been investigated. The strain response, being similarly low (order of 10-5) as in the classical lead magnesium niobate relaxor, is shown to be of solely electrostrictive origin, as a pure quadratic relation holds between induced strain and electric polarization. The strain dependence on the SrTiO3 content is presented and discussed. Furthermore, electrostrictive coefficients are shown to be constant over a broad temperature range and, similar to dielectric properties, independent of electric-field cycles, which suggests possible applications of this translucent, high-dielectric constant, and environmental-friendly ceramic system.

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Journal of Applied Physics  (Volume:98 ,  Issue: 2 )