Eur. Phys. J. Appl. Phys.
Volume 53, Number 2, February 2011
|Number of page(s)||10|
|Section||Imaging, Microscopy and Spectroscopy|
|Published online||28 January 2011|
Dielectric and structural properties of diffuse ferroelectric phase transition in Pb1.85K1.15Li0.15Nb5O15 ceramic
LMCN, F.S.T.G. University Cadi Ayyad Marrakech, Marrakech, Morocco
2 LPMC, Université de Picardie, 33 rue Saint-Leu, 80039 Amiens Cedex, France
3 LPMC, Équipe Physique de l'environnement, Université Chouaib DoukKali, F.S. El Jadida, Morocco
4 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
5 Dipartimento di Fisica, Universita di Roma II “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
Corresponding author: firstname.lastname@example.org
Revised: 28 September 2010
Accepted: 22 November 2010
Published online: 28 January 2011
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.
© EDP Sciences, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.