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Ferroelectrics Volume 455, 2013 - Issue 1
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SECTION B: PROCESS AND CHARACTERIZATION

Influence of Compressive Stress on Dielectric and Ferroelectric Properties of the Na0. 5K0.5NbO3, Na0.5K0.5(Nb0.94Sb0.06)O3 and Na0.5K0.5(Nb0.94Sb0.06)O3 +0.5mol%MnO2 Ceramics

J. Suchanicz Institute of Physics, Pedagogical University, 30-084, Krakow, Poland
,
I. Faszczowy Institute of Physics, Pedagogical University, 30-084, Krakow, Poland
,
G. Klimkowski Institute of Physics, Pedagogical University, 30-084, Krakow, Poland
,
U. Lewczuk Institute of Physics, Pedagogical University, 30-084, Krakow, Poland
,
M. Karpierz Institute of Physics, Pedagogical University, 30-084, Krakow, Poland
&
A. Sternberg Institute of Solid State Physics, University of Latvia, LV-1063, Riga, Latvia
Pages 136-141 | Received 11 Dec 2012, Accepted 08 Mar 2013, Published online: 10 Dec 2013
 
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Abstract

Good quality lead-free ceramics of Na0.5K0.5NbO3, Na0.5K0.5(Nb0.94Sb0.06)O3 and Na0.5K0.5(Nb0.94Sb0.06)O3 +0.5mol%MnO2 have been produced by a solid phase hot pressing sintering process at 1120–1145°C. The dependence of dielectric and ferroelectric properties on the uniaxial pressure (0–3000 bar) of the these samples was investigated, revealing a significant influence of the external stress on their properties. This includes a shift of the phase transition, a diffuseness of the permittivity characteristics, a change of the dielectric dispersion and a decrease of the polarization. We discuss our results based on hardening of the soft-mode and domain switching processes under applying of pressure.

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