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Dielectric and structural properties of diffuse ferroelectric phase transition in Pb1.85K1.15Li0.15Nb5O15 ceramic

Published online by Cambridge University Press:  28 January 2011

E. Choukri ,
Y. Gagou ,
D. Mezzane ,
Z. Abkhar ,
R. El Moznine ,
I. Luk'yanchuk ,
P. Saint-Grégoire  and
A. V. Kavokin
E. Choukri
Affiliation:
LMCN, F.S.T.G. University Cadi Ayyad Marrakech, Marrakech, Morocco
Y. Gagou
Affiliation:
LPMC, Université de Picardie, 33 rue Saint-Leu, 80039 Amiens Cedex, France
D. Mezzane*
Affiliation:
LMCN, F.S.T.G. University Cadi Ayyad Marrakech, Marrakech, Morocco
Z. Abkhar
Affiliation:
LMCN, F.S.T.G. University Cadi Ayyad Marrakech, Marrakech, Morocco
R. El Moznine
Affiliation:
LPMC, Équipe Physique de l'environnement, Université Chouaib DoukKali, F.S. El Jadida, Morocco
I. Luk'yanchuk
Affiliation:
LPMC, Université de Picardie, 33 rue Saint-Leu, 80039 Amiens Cedex, France
P. Saint-Grégoire
Affiliation:
University of Nîmes, Department of Sciences, Rue du Dr Georges Salan, 30021 Nîmes Cedex 01, France and C2M, Institut C. Gerhardt, UMR-CNRS 5253, 34095 Montpellier Cedex 05, France
A. V. Kavokin
Affiliation:
Dipartimento di Fisica, Universita di Roma II “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
*
mezdaoud@yahoo.fr
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Abstract

We studied the structural and dielectric properties of new Tetragonal Tungsten Bronze (TTB) ceramics Pb1.85K1.15Li0.15Nb5O15 that was synthesized by solid-state reaction. We pay a special attention to the diffuse phase transition (DPT) that occurs close to 425 °C. Using dielectric measurements in a frequency range of 10 Hz–1 MHz and in the temperature range 30–560 °C, we have shown that the real permittivity close to DPT is well described by Santos-Eiras phenomenological model. Space-charge polarization, relaxation phenomena and free charges conductivity have been analyzed using dielectric spectroscopy impedance and modulus characterization. Cole-Cole plots show a non-Debye (polydispersive) type relaxation. In paraelectric phase the Arrhenius activation energy was determined as Eτ = 0.72 eV. We demonstrated that frequency dependence of ac conductivity at different temperatures obeys the Jonscher's universal law: σac = σdc + A(ω)n.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 53 , Issue 2 , February 2011 , 20901
Copyright
© EDP Sciences, 2011

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