Conductivity investigations of Aurivillius-type Bi sub(2.5Gd) sub(1).5Ti sub(3O) sub(1)2 ceramics

The aim of the present work is to investigate newly sintered ceramics of gadolinium-substituted Aurivillius-type bismuth titanate, Bi sub(2.5Gd) sub(1).5Ti sub(3O) sub(1)2, by the impedance spectroscopy. The measurements were performed as a function of both frequency and temperature in the frequency...

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Bibliographic Details
Published in:Solid state ionics 2011-04, Vol.188 (1), p.50-52
Main Authors: Masiukaite, E, Banys, J, Sobiestianskas, R, Ramoska, T, Khomchenko, V A, Kiselev, DA
Format: Article
Language:English
Subjects:
Activation energy
Bismuth titanate
Ceramics
Conductivity
Dielectric relaxation
Electrical resistivity
Impedance spectroscopy
Resistivity
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Summary:The aim of the present work is to investigate newly sintered ceramics of gadolinium-substituted Aurivillius-type bismuth titanate, Bi sub(2.5Gd) sub(1).5Ti sub(3O) sub(1)2, by the impedance spectroscopy. The measurements were performed as a function of both frequency and temperature in the frequency range 20 Hz-1 MHz and in the temperature range 300 K-1050 K. The electrical conductivity and dielectric relaxation have been analyzed in terms of specific resistivity and electrical modulus. The onset of the ionic conductivity in the ceramic appears above the phase transition temperature, T sub(0 = 468 K. Activation energy for the conductivity was found to be Delta E) sub(A) = 0.98 eV, while conductivity in grains has Delta E sub(g = 0.93 eV. Impedance spectroscopy measurements of Bi) sub(2).5Gd sub(1.5Ti) sub(3)O sub(12 (BGT) ceramic were performed. The complex dielectric permittivity revealed anomaly at T) sub(0) = 468 K. Activation energy of Bi sub(2.5Gd) sub(1).5Ti sub(3O) sub(1)2 ceramic was found to be E sub(g = 0.93 eV.)
ISSN:0167-2738
DOI:10.1016/j.ssi.2010.10.027