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Ferroelectrics Volume 463, 2014 - Issue 1: Proceedings of the Thirteenth International Meeting on Ferroelectricity (IMF-13)
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Section C: Characterization of Ceramics

Dielectric Properties of 0.9Ag0.9Li0.1NbO3 – 0.1Bi0.5K0.5TiO3 Ceramics

J. PozingisDepartment of Radiophysics, Vilnius University, Sauletekio 9, Vilnius, Lithuania
,
J. MacutkevicDepartment of Radiophysics, Vilnius University, Sauletekio 9, Vilnius, LithuaniaCorrespondence[email protected]
,
R. GrigalaitisDepartment of Radiophysics, Vilnius University, Sauletekio 9, Vilnius, Lithuania
,
J. BanysDepartment of Radiophysics, Vilnius University, Sauletekio 9, Vilnius, Lithuania
&
D. C. LupascuInstitute for Materials Science, University of Duisburg-Essen, Essen, Germany
Pages 99-104 | Received 02 Sep 2013, Accepted 23 Sep 2013, Published online: 02 May 2014
 
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Abstract

New ferrielectric 0.9Ag0.9Li0.1NbO3–0.1Bi0.5K0.5TiO3 ceramics have been obtained. At room temperature ceramics exhibit perovskite structure, which is close to rombohedral-tetragonal phase boundary. The dielectric properties of ceramics were investigated in wide frequency range from 20 Hz to 1 GHz at temperatures 200 K–750 K. 0.9Ag0.9Li0.1NbO3–0.1Bi0.5K0.5TiO3 ceramics exhibits a first order mixed order-disorder and displacive ferroelectric phase transition at TC = 430 K. The phase transition dynamics is caused by relaxation soft mode at frequencies below 1 GHz and soft phonon mode at higher frequencies. In ferroelectric phase an additional dielectric dispersion is observed, which could be attributed to dipolar glass relaxation.

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