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Ferroelectrics Volume 397, 2010 - Issue 1
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Original Articles

The Effect of PbO-Nonstoichiometry on Dielectric and Semiconducting Properties of PbFe0.5Nb0.5O3-Based Ceramics

I. P. Raevski Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
,
S. P. Kubrin Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
,
S. A. Kovrigina Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
,
S. I. Raevskaya Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
,
V. V. Titov Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
,
A. S. Emelyanov Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
,
M. A. Malitskaya Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
&
I. N. Zakharchenko Institute of Physics and Physical Department of Southern Federal University, Stachki Ave. 194, Rostov on Don, 344090, Russia
 show all
Pages 96-101 | Received 22 Sep 2009, Accepted 20 Jan 2010, Published online: 23 Jun 2010
 
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Abstract

Dielectric, X-ray and electric resistivity studies of nonstoichiometric PbFe0.5Nb0.5O3-based ceramics obtained by solid-state reaction route with PbO/(Fe0.5Nb0.5O2) molar ratio differing from 0.6 to 1.2 have been carried out. Deviation from stoichiometric PbFe0.5Nb0.5O3 composition leads to formation of diphase mixtures containing ferroelectric perovskite PbFe0.5Nb0.5O3 phase and nonferroelectric PbO or pyrochlore Pb3Nb4O13 phases and to decreasing of the dielectric permittivity values. The electric resistivity of PbFe0.5Nb0.5O3 ceramics decreases dramatically when the sintering temperature increases. The formation of the pyrochlore phase decreases the room temperature resistivity values while the anomaly of the positive temperature coefficient of resistivity above the ferroelectric Curie temperature gradually diminishes with the increase of the pyrochlore content.

Acknowledgment

This study is supported in part by the Russian Foundation for Basic Research (RFBR) grant 09-02-92672 IND_a.

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